Compared to the previous decades, presently the generation of household and industrial waste has increased too many folds. The resulting waste has posed a serious management problem. Various techniques are being explored for organic waste management such as biodegradation, microbial degradation, etc. But still, the processes required technological updates to minimize issues related to cost, ease of implementation, etc. Recently, the pyrolysis of such waste in the limited presence of oxygen is in trend. The product so obtained called as “Biochar” offer immense utilization in the domain of environmental pollutants remediation. Biochar offered varieties of beneficial properties, including high rough, porous as well as high specific surfaces area enriched with various active functionalities. These properties are very beneficial while being utilized as a support material in the Nano regime. The present article consolidates the broad area deployment of biochar in diversified fields including adsorption, photo catalysis etc. A special intention has been given to the deployment of biochar in the field of effluent remediation.
{"title":"Role of biochar as support material for photo catalytic operation: A review","authors":"Pooja Dhiman , Manisha Dhiman , Arush Sharma , Manita Thakur , Sourav Gautam , Ajay Kumar","doi":"10.1016/j.scenv.2024.100174","DOIUrl":"10.1016/j.scenv.2024.100174","url":null,"abstract":"<div><div>Compared to the previous decades, presently the generation of household and industrial waste has increased too many folds. The resulting waste has posed a serious management problem. Various techniques are being explored for organic waste management such as biodegradation, microbial degradation, etc. But still, the processes required technological updates to minimize issues related to cost, ease of implementation, etc. Recently, the pyrolysis of such waste in the limited presence of oxygen is in trend. The product so obtained called as “Biochar” offer immense utilization in the domain of environmental pollutants remediation. Biochar offered varieties of beneficial properties, including high rough, porous as well as high specific surfaces area enriched with various active functionalities. These properties are very beneficial while being utilized as a support material in the Nano regime. The present article consolidates the broad area deployment of biochar in diversified fields including adsorption, photo catalysis etc. A special intention has been given to the deployment of biochar in the field of effluent remediation.</div></div>","PeriodicalId":101196,"journal":{"name":"Sustainable Chemistry for the Environment","volume":"8 ","pages":"Article 100174"},"PeriodicalIF":0.0,"publicationDate":"2024-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142533974","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The recurring problem of oil spillage has directed research to the exploration of various agricultural wastes in order to discover new, inexpensive, and environmentally friendly oil sorbents. This research studied the viability of native and acetylated seed pods of Siamese senna as oil spill mop. SEM, BET, and FTIR analyses were employed to assess the adsorption tendency of the adsorbents for crude oil. Investigation of the oil sorption behaviors of the adsorbents involved batch sorption experiments. The SEM analysis revealed improvements in the surface morphology of the acetylated pods. The BET surface area increased from 265.2 m2/g to 335.0 m2/g after acetylation. The FTIR spectra of the oil-treated pods showed that the acetylated pods adsorbed more oil than the native pods. The Langmuir isotherm best described the sorption equilibrium for the adsorbents. Kinetic analysis showed that the sorption processes conformed to the pseudo-second-order model, and were controlled by film diffusion alone or in conjunction with other mechanisms. The results obtained in this work show that Siamese senna seed pods can be used for crude oil sorption from an aqueous medium. The improved oil sorption capacity of the acetylated pod shows that it has more potential to serve as a low-cost alternative for oil spill remediation than the native seed pod.
反复出现的石油泄漏问题促使研究人员探索各种农业废弃物，以发现新的、廉价的、环保的石油吸附剂。本研究对暹罗番泻叶的原生和乙酰化豆荚作为溢油拖把的可行性进行了研究。利用扫描电镜、BET 和傅立叶变换红外分析评估了吸附剂对原油的吸附倾向。对吸附剂石油吸附行为的研究包括批量吸附实验。扫描电镜分析表明，乙酰化豆荚的表面形态有所改善。乙酰化后的 BET 表面积从 265.2 m2/g 增加到 335.0 m2/g。油处理豆荚的傅立叶变换红外光谱显示，乙酰化豆荚比原生豆荚吸附了更多的油。朗缪尔等温线最好地描述了吸附剂的吸附平衡。动力学分析表明，吸附过程符合伪二阶模型，并由薄膜扩散单独或与其他机制共同控制。这项研究的结果表明，暹罗番泻叶豆荚可用于吸附水介质中的原油。乙酰化豆荚对油的吸附能力的提高表明，与原生豆荚相比，乙酰化豆荚更有潜力成为一种低成本的溢油补救替代品。
{"title":"Crude oil sorption performance of native and acetylated Siamese senna seed pods","authors":"Amalachukwu Ifeyinwa Obi, Adaku Chinonyerem Ajiwe, Patrice-Anthony Chudi Okoye, Chisom Theresa Umeh, Emeka Godson Amadi","doi":"10.1016/j.scenv.2024.100173","DOIUrl":"10.1016/j.scenv.2024.100173","url":null,"abstract":"<div><div>The recurring problem of oil spillage has directed research to the exploration of various agricultural wastes in order to discover new, inexpensive, and environmentally friendly oil sorbents. This research studied the viability of native and acetylated seed pods of Siamese senna as oil spill mop. SEM, BET, and FTIR analyses were employed to assess the adsorption tendency of the adsorbents for crude oil. Investigation of the oil sorption behaviors of the adsorbents involved batch sorption experiments. The SEM analysis revealed improvements in the surface morphology of the acetylated pods. The BET surface area increased from 265.2 m<sup>2</sup>/g to 335.0 m<sup>2</sup>/g after acetylation. The FTIR spectra of the oil-treated pods showed that the acetylated pods adsorbed more oil than the native pods. The Langmuir isotherm best described the sorption equilibrium for the adsorbents. Kinetic analysis showed that the sorption processes conformed to the pseudo-second-order model, and were controlled by film diffusion alone or in conjunction with other mechanisms. The results obtained in this work show that Siamese senna seed pods can be used for crude oil sorption from an aqueous medium. The improved oil sorption capacity of the acetylated pod shows that it has more potential to serve as a low-cost alternative for oil spill remediation than the native seed pod.</div></div>","PeriodicalId":101196,"journal":{"name":"Sustainable Chemistry for the Environment","volume":"8 ","pages":"Article 100173"},"PeriodicalIF":0.0,"publicationDate":"2024-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142533973","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Tryptophan capped Silver nanoparticles (AgNPs) were synthesized through a sonochemical method, utilizing tryptophan as a biocompatible and non-toxic capping agent. Based on UV–visible spectra, the optical band gap of the nanoparticles was found to be roughly 3.01 eV. The TEM and XRD measurements of the particle sizes showed a range of 10–22 nm. Under sun irradiation, these nanoparticles showed notable photocatalytic activity, destroying Methylene Blue (MB) dye by more than 79.4 %. With a pseudo-first-order apparent rate constant of 1.5×10−2min-1, the degradation kinetics were observed. The photocatalysis of MB dye was investigated using liquid chromatography in conjunction with electrospray ionization time-of-flight mass spectrometry (LC-ESI-TOF-MS) to determine the products generated and to clarify the degradation processes. Additionally, the antibacterial, anticancer potential showed thate the nanoparticles exhibited good antibacterial and notable anticancer properties. Furthermore, the antidiabetic activity was investigated through α-glucosidase inhibition, demonstrating a significant inhibition rate of 53.98 %. Antioxidant capabilities were also tested using ABTS and DPPH assays, revealing antioxidant activities of 73.9 % and 52.04 %, respectively. Overall, the synthesized tryptophan-capped AgNPs show promising applications in environmental remediation, as well as potential therapeutic uses.
{"title":"Characterization, biological activity and photodegradation efficacy of synthesized tryptophan capped silver nanoparticles","authors":"Reshma. , Hussain Shaik , Venkatesan K. , Raju Sandupatla , Kadeer M.D. , Veera Somaiah Puppala","doi":"10.1016/j.scenv.2024.100172","DOIUrl":"10.1016/j.scenv.2024.100172","url":null,"abstract":"<div><div>Tryptophan capped Silver nanoparticles (AgNPs) were synthesized through a sonochemical method, utilizing tryptophan as a biocompatible and non-toxic capping agent. Based on UV–visible spectra, the optical band gap of the nanoparticles was found to be roughly 3.01 eV. The TEM and XRD measurements of the particle sizes showed a range of 10–22 nm. Under sun irradiation, these nanoparticles showed notable photocatalytic activity, destroying Methylene Blue (MB) dye by more than 79.4 %. With a pseudo-first-order apparent rate constant of 1.5×10<sup>−2</sup>min-1, the degradation kinetics were observed. The photocatalysis of MB dye was investigated using liquid chromatography in conjunction with electrospray ionization time-of-flight mass spectrometry (LC-ESI-TOF-MS) to determine the products generated and to clarify the degradation processes. Additionally, the antibacterial, anticancer potential showed thate the nanoparticles exhibited good antibacterial and notable anticancer properties. Furthermore, the antidiabetic activity was investigated through α-glucosidase inhibition, demonstrating a significant inhibition rate of 53.98 %. Antioxidant capabilities were also tested using ABTS and DPPH assays, revealing antioxidant activities of 73.9 % and 52.04 %, respectively. Overall, the synthesized tryptophan-capped AgNPs show promising applications in environmental remediation, as well as potential therapeutic uses.</div></div>","PeriodicalId":101196,"journal":{"name":"Sustainable Chemistry for the Environment","volume":"8 ","pages":"Article 100172"},"PeriodicalIF":0.0,"publicationDate":"2024-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142533972","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-10-11DOI: 10.1016/j.scenv.2024.100171
Pavithra Swaminaathan, A. Saravanan, P.R. Yaashikaa, A.S. Vickram
Ecosystems and human health are seriously threatened by persistent organic pollutants (POPs), which are hazardous, resistant to environmental degradation, and have the capability of bioaccumulating. The sources, ecological dispersion, and potential adverse impacts of POPs are investigated in this study, which further highlights the urgent need to develop successful remediation technologies. As it can use light energy to promote degradation, photocatalysis is a promising approach among other methods. The review explores many evolved photocatalyst materials, such as those based on nanomaterials, metal-organic frameworks (MOFs), carbon, and hybrids, highlighting their characteristics and functions in the removal of pollutants. Enhancing photocatalytic performance through modification techniques such as surface changes, doping, and co-catalyst insertion is explored. The focus is on the degrading mechanisms specific to POPs and further examines the basic ideas and processes of photocatalysis. Despite its enormous significance, environmental stability, electron-hole pair recombination, and limited light absorption are some of the obstacles that photocatalysis faces. Finally, this analysis calls for novel materials and optimization techniques to overcome existing constraints and enhance the effectiveness of POP removal, highlighting future directions for photocatalyst research.
{"title":"Recent advances in photocatalytic degradation of persistent organic pollutants: Mechanisms, challenges, and modification strategies","authors":"Pavithra Swaminaathan, A. Saravanan, P.R. Yaashikaa, A.S. Vickram","doi":"10.1016/j.scenv.2024.100171","DOIUrl":"10.1016/j.scenv.2024.100171","url":null,"abstract":"<div><div>Ecosystems and human health are seriously threatened by persistent organic pollutants (POPs), which are hazardous, resistant to environmental degradation, and have the capability of bioaccumulating. The sources, ecological dispersion, and potential adverse impacts of POPs are investigated in this study, which further highlights the urgent need to develop successful remediation technologies. As it can use light energy to promote degradation, photocatalysis is a promising approach among other methods. The review explores many evolved photocatalyst materials, such as those based on nanomaterials, metal-organic frameworks (MOFs), carbon, and hybrids, highlighting their characteristics and functions in the removal of pollutants. Enhancing photocatalytic performance through modification techniques such as surface changes, doping, and co-catalyst insertion is explored. The focus is on the degrading mechanisms specific to POPs and further examines the basic ideas and processes of photocatalysis. Despite its enormous significance, environmental stability, electron-hole pair recombination, and limited light absorption are some of the obstacles that photocatalysis faces. Finally, this analysis calls for novel materials and optimization techniques to overcome existing constraints and enhance the effectiveness of POP removal, highlighting future directions for photocatalyst research.</div></div>","PeriodicalId":101196,"journal":{"name":"Sustainable Chemistry for the Environment","volume":"8 ","pages":"Article 100171"},"PeriodicalIF":0.0,"publicationDate":"2024-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142533500","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-10-10DOI: 10.1016/j.scenv.2024.100170
M. Manjudevi , M. Kamaraj , J. Aravind , Ling Shing Wong
Fish is a prominent protein source due to its affordability and nutritional safety. Although many people consume fish, they might not know how much fish scale debris is produced by the food and aquaculture sectors. The fish processing industry has grown significantly and contributes to global economic growth. Million tons of fish waste end up in landfills worldwide yearly. Fish scale disposal in landfills has the potential to seriously pollute the ecosystem. Hence, fish-scale waste can create valuable products with favorable environmental and financial effects. Fish scales are a naturally occurring resource with abundant applications as biomaterials. They are composed of collagen, hydroxyapatite, chitin, and gelatin, and their hierarchical structure is similar to that of human hard tissues. It is advantageous for fish scales due to its mechanical attributes, biodegradability, and biocompatibility. This paper reviews the latest importance of fish biomass/industry waste products in extracting biomaterials or converting them into value-added products. A summary of the most significant applications of fish scales over the previous three years in diverse fields such as food science and engineering, adsorbent, agriculture, tissue engineering, cosmetics, pharmaceutical and nutraceuticals, etc. The review also discusses the need for and importance of circular economy concepts related to fish scale biomass conversion and its future perspectives. There is enormous potential in the conversion of fish scale biomass, which is predicted in the future with the expansion of technological advancements.
{"title":"Application of the circular economy to fish scale waste","authors":"M. Manjudevi , M. Kamaraj , J. Aravind , Ling Shing Wong","doi":"10.1016/j.scenv.2024.100170","DOIUrl":"10.1016/j.scenv.2024.100170","url":null,"abstract":"<div><div>Fish is a prominent protein source due to its affordability and nutritional safety. Although many people consume fish, they might not know how much fish scale debris is produced by the food and aquaculture sectors. The fish processing industry has grown significantly and contributes to global economic growth. Million tons of fish waste end up in landfills worldwide yearly. Fish scale disposal in landfills has the potential to seriously pollute the ecosystem. Hence, fish-scale waste can create valuable products with favorable environmental and financial effects. Fish scales are a naturally occurring resource with abundant applications as biomaterials. They are composed of collagen, hydroxyapatite, chitin, and gelatin, and their hierarchical structure is similar to that of human hard tissues. It is advantageous for fish scales due to its mechanical attributes, biodegradability, and biocompatibility. This paper reviews the latest importance of fish biomass/industry waste products in extracting biomaterials or converting them into value-added products. A summary of the most significant applications of fish scales over the previous three years in diverse fields such as food science and engineering, adsorbent, agriculture, tissue engineering, cosmetics, pharmaceutical and nutraceuticals, etc. The review also discusses the need for and importance of circular economy concepts related to fish scale biomass conversion and its future perspectives. There is enormous potential in the conversion of fish scale biomass, which is predicted in the future with the expansion of technological advancements.</div></div>","PeriodicalId":101196,"journal":{"name":"Sustainable Chemistry for the Environment","volume":"8 ","pages":"Article 100170"},"PeriodicalIF":0.0,"publicationDate":"2024-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142444555","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
A composite FeAl-LDH@BC obtained by successfully loading FeAl-LDH onto biochar (BC) is used to the Cr(VI)-contaminated soil remediation. The efforts of loading, initial pH, concentration and dosage are investigated. The results indicate that the immobilization process of Cr(VI) in soil could be well described by the pseudo-second-order kinetic model and maximum adsorption capacity of FeAl-LDH@BC is 42.78 mg/g at a temperature of 298 K. Additionally, The physicochemical properties of FeAl-LDH@BC are characterized by SEM, EDS, XRD, FTIR and XPS. The characterization results suggest that the immobilization mechanism involved adsorption and reduction. Cr(VI) is immobilized by adsorption to the layers of FeAl-LDH, the reduction of Cr(VI) to Cr(III) is then accomplished using Fe(II) as a reducing agent. In order to demonstrated the stability of composites for environmental restoration, the TCLP tests, dry-wet, freeze-thaw aging cycles, soil phytotoxicity tests, and microbial community are analyzed. The study shows that we provided a material for soil immobilization with high performance for the remediation of Cr(VI)-contaminated soil.
{"title":"FeAl-LDH-modified biochar (FeAl-LDH@BC): A high-efficiency passivator for hexavalent chromium (Cr(VI)) reduction and immobilization in contaminated soil","authors":"Rongjie Zhu , Wenying Yuan , Jing Cheng , Xinhong Qiu","doi":"10.1016/j.scenv.2024.100169","DOIUrl":"10.1016/j.scenv.2024.100169","url":null,"abstract":"<div><div>A composite FeAl-LDH@BC obtained by successfully loading FeAl-LDH onto biochar (BC) is used to the Cr(VI)-contaminated soil remediation. The efforts of loading, initial pH, concentration and dosage are investigated. The results indicate that the immobilization process of Cr(VI) in soil could be well described by the pseudo-second-order kinetic model and maximum adsorption capacity of FeAl-LDH@BC is 42.78 mg/g at a temperature of 298 K. Additionally, The physicochemical properties of FeAl-LDH@BC are characterized by SEM, EDS, XRD, FTIR and XPS. The characterization results suggest that the immobilization mechanism involved adsorption and reduction. Cr(VI) is immobilized by adsorption to the layers of FeAl-LDH, the reduction of Cr(VI) to Cr(III) is then accomplished using Fe(II) as a reducing agent. In order to demonstrated the stability of composites for environmental restoration, the TCLP tests, dry-wet, freeze-thaw aging cycles, soil phytotoxicity tests, and microbial community are analyzed. The study shows that we provided a material for soil immobilization with high performance for the remediation of Cr(VI)-contaminated soil.</div></div>","PeriodicalId":101196,"journal":{"name":"Sustainable Chemistry for the Environment","volume":"8 ","pages":"Article 100169"},"PeriodicalIF":0.0,"publicationDate":"2024-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142441815","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-10-09DOI: 10.1016/j.scenv.2024.100166
Konstantinos N. Maroulas , Aristi Karakotsou , Stavros G. Poulopoulos , Ioannis Konstantinou , Kalliopi Ladomenou , George Z. Kyzas
Graphene-based materials such as graphene oxide (GO) and reduced graphene oxide (rGO), have been extensively used for wastewater purification and treatment. Their unique properties, including large surface area, tunable pore structures, high adsorption capacity, electrical conductivity, rich surface chemistry and catalytic activity, make them highly efficient as adsorbents and photocatalysts for the removal of a wide range of pollutants. Consequently, innovative and cost-effective methods for the preparation of these materials are required to broaden their application. This review comprehensively elucidates recent advances in the synthesis of graphene-based adsorbents and photocatalysts derived from various agricultural wastes, including oil palm trunks, coconut shells, tea wastes and rice straws. The manuscript focuses on methodologies used to convert agricultural residues into graphene, highlighting key processes such as pyrolysis and chemical reduction. Innovative approaches for reducing of GO to rGO using plant extracts as reducing agents are discussed in detail, with an examination of their synthetic mechanisms and potential drawbacks. Special emphasis is placed on the characterization techniques employed for the prepared materials including X-ray diffraction (XRD), Raman Spectroscopy, Atomic Force Microscopy (AFM), X-ray Photoelectron Spectroscopy (XPS), Fourier transform infrared (FTIR), Scanning Electron Microscopy (SEM), and Nuclear Magnetic Resonance (NMR). Additionally, the review provides a timely overview of the adsorption performance of these graphene materials in removing various organic and inorganic pollutants, such as dyes, heavy metals, and pharmaceuticals. The photocatalytic efficiency of these materials in degrading pollutants under different light sources is also critically evaluated. Overall, this review highlights the potential of graphene derived from agricultural wastes as a promising solution for sustainable environmental remediation and lays the groundwork for future innovations in this field.
氧化石墨烯（GO）和还原氧化石墨烯（rGO）等石墨烯基材料已被广泛用于废水净化和处理。石墨烯材料具有独特的性能，包括大表面积、可调孔隙结构、高吸附能力、导电性、丰富的表面化学性质和催化活性，因此可作为高效吸附剂和光催化剂去除多种污染物。因此，需要创新且具有成本效益的方法来制备这些材料，以扩大其应用范围。本综述全面阐述了从各种农业废弃物（包括油棕树干、椰子壳、茶叶废弃物和稻草）中合成石墨烯基吸附剂和光催化剂的最新进展。手稿重点介绍了将农业残留物转化为石墨烯的方法，突出了热解和化学还原等关键过程。文中详细讨论了使用植物萃取物作为还原剂将 GO 还原成 rGO 的创新方法，并研究了这些方法的合成机制和潜在缺点。特别强调了所制备材料的表征技术，包括 X 射线衍射 (XRD)、拉曼光谱、原子力显微镜 (AFM)、X 射线光电子能谱 (XPS)、傅立叶变换红外 (FTIR)、扫描电子显微镜 (SEM) 和核磁共振 (NMR)。此外，综述还及时概述了这些石墨烯材料在去除各种有机和无机污染物（如染料、重金属和药物）方面的吸附性能。此外，还对这些材料在不同光源下降解污染物的光催化效率进行了严格评估。总之，本综述强调了从农业废弃物中提取的石墨烯作为可持续环境修复解决方案的潜力，并为该领域未来的创新奠定了基础。
{"title":"Graphene adsorbents and photocatalysts derived from agricultural wastes: A review","authors":"Konstantinos N. Maroulas , Aristi Karakotsou , Stavros G. Poulopoulos , Ioannis Konstantinou , Kalliopi Ladomenou , George Z. Kyzas","doi":"10.1016/j.scenv.2024.100166","DOIUrl":"10.1016/j.scenv.2024.100166","url":null,"abstract":"<div><div>Graphene-based materials such as graphene oxide (GO) and reduced graphene oxide (rGO), have been extensively used for wastewater purification and treatment. Their unique properties, including large surface area, tunable pore structures, high adsorption capacity, electrical conductivity, rich surface chemistry and catalytic activity, make them highly efficient as adsorbents and photocatalysts for the removal of a wide range of pollutants. Consequently, innovative and cost-effective methods for the preparation of these materials are required to broaden their application. This review comprehensively elucidates recent advances in the synthesis of graphene-based adsorbents and photocatalysts derived from various agricultural wastes, including oil palm trunks, coconut shells, tea wastes and rice straws. The manuscript focuses on methodologies used to convert agricultural residues into graphene, highlighting key processes such as pyrolysis and chemical reduction. Innovative approaches for reducing of GO to rGO using plant extracts as reducing agents are discussed in detail, with an examination of their synthetic mechanisms and potential drawbacks. Special emphasis is placed on the characterization techniques employed for the prepared materials including X-ray diffraction (XRD), Raman Spectroscopy, Atomic Force Microscopy (AFM), X-ray Photoelectron Spectroscopy (XPS), Fourier transform infrared (FTIR), Scanning Electron Microscopy (SEM), and Nuclear Magnetic Resonance (NMR). Additionally, the review provides a timely overview of the adsorption performance of these graphene materials in removing various organic and inorganic pollutants, such as dyes, heavy metals, and pharmaceuticals. The photocatalytic efficiency of these materials in degrading pollutants under different light sources is also critically evaluated. Overall, this review highlights the potential of graphene derived from agricultural wastes as a promising solution for sustainable environmental remediation and lays the groundwork for future innovations in this field.</div></div>","PeriodicalId":101196,"journal":{"name":"Sustainable Chemistry for the Environment","volume":"8 ","pages":"Article 100166"},"PeriodicalIF":0.0,"publicationDate":"2024-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142432323","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-10-05DOI: 10.1016/j.scenv.2024.100168
Nelum K. Wijekoon , Gayan A. Appuhamillage , Rohan S. Dassanayake , Renuka N. Liyanage , Dulanjaya Mapage , Achintha Wijenayake , Eshani L. Lokuge , Suranga M. Rajapaksha , Gayan A. Abeygunawardane , N.D.D. Danuka Senarath
This work presents a green, cost-effective and eco-friendly strategy to reduce noise pollution by developing biopolymer-based 3D-printed acoustic panels. We successfully fabricated two series of composites by varying the weight percentage (wt%) of cellulose fibers of water hyacinth (WH) and pineapple leaf (PAL), with polylactic acid (PLA) as the matrix via the heat-press method. All samples were characterized using Fourier transform infrared (FTIR) spectroscopy, thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), and scanning electron microscopy (SEM). Physico-mechanical properties, including hardness, tensile, and impact strength, were improved with increasing fiber loading. Filaments of 1 wt% water hyacinth fibers (WHFs) in PLA (1 WHF/PLA) and 1 wt% pineapple leaf fibers (PALFs) in PLA (1 PALF/PLA) were prepared and tested for 3D printability. The sound absorption coefficients (α) of the 3D-printed panels were investigated from 500 to 5000 Hz sound frequency range. The 3D-printed 1 WHF/PLA and 1 PALF/PLA acoustic panels achieve a maximum α (α-max) of 0.55 and 0.83 at 5000 and 4000 Hz, respectively, featuring the first work to report α-max > 0.5 at low fiber loadings in the high-frequency sound range. The tensile strength of the 3D-printed versions is significantly higher than non-3D-printed counterparts and commercial acoustic absorbers. Our data suggest the prepared 3D-printed panels are excellent candidates for acoustic applications at high-frequency noises. This study exhibits a facile, environmentally benign and sustainable approach to construct highly efficient and mechanically robust biopolymer-based 3D-printed sound-proof panels, which have promising potential as green engineering materials. Interestingly, this research also proposes a mitigation technology for the freshwater invader, Eichhornia crassipes (water hyacinths).
{"title":"Facile fabrication of 3D-printed cellulosic fiber/polylactic acid composites as low-cost and sustainable acoustic panels","authors":"Nelum K. Wijekoon , Gayan A. Appuhamillage , Rohan S. Dassanayake , Renuka N. Liyanage , Dulanjaya Mapage , Achintha Wijenayake , Eshani L. Lokuge , Suranga M. Rajapaksha , Gayan A. Abeygunawardane , N.D.D. Danuka Senarath","doi":"10.1016/j.scenv.2024.100168","DOIUrl":"10.1016/j.scenv.2024.100168","url":null,"abstract":"<div><div>This work presents a green, cost-effective and eco-friendly strategy to reduce noise pollution by developing biopolymer-based 3D-printed acoustic panels. We successfully fabricated two series of composites by varying the weight percentage (wt%) of cellulose fibers of water hyacinth (WH) and pineapple leaf (PAL), with polylactic acid (PLA) as the matrix via the heat-press method. All samples were characterized using Fourier transform infrared (FTIR) spectroscopy, thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), and scanning electron microscopy (SEM). Physico-mechanical properties, including hardness, tensile, and impact strength, were improved with increasing fiber loading. Filaments of 1 wt% water hyacinth fibers (WHFs) in PLA (1 WHF/PLA) and 1 wt% pineapple leaf fibers (PALFs) in PLA (1 PALF/PLA) were prepared and tested for 3D printability. The sound absorption coefficients (α) of the 3D-printed panels were investigated from 500 to 5000 Hz sound frequency range. The 3D-printed 1 WHF/PLA and 1 PALF/PLA acoustic panels achieve a maximum α (α-max) of 0.55 and 0.83 at 5000 and 4000 Hz, respectively, featuring the first work to report α-max > 0.5 at low fiber loadings in the high-frequency sound range. The tensile strength of the 3D-printed versions is significantly higher than non-3D-printed counterparts and commercial acoustic absorbers. Our data suggest the prepared 3D-printed panels are excellent candidates for acoustic applications at high-frequency noises. This study exhibits a facile, environmentally benign and sustainable approach to construct highly efficient and mechanically robust biopolymer-based 3D-printed sound-proof panels, which have promising potential as green engineering materials. Interestingly, this research also proposes a mitigation technology for the freshwater invader, <em>Eichhornia crassipes</em> (water hyacinths).</div></div>","PeriodicalId":101196,"journal":{"name":"Sustainable Chemistry for the Environment","volume":"8 ","pages":"Article 100168"},"PeriodicalIF":0.0,"publicationDate":"2024-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142432237","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-10-05DOI: 10.1016/j.scenv.2024.100165
Lawrence Sawunyama , Opeyemi A. Oyewo , Mokgadi F. Bopape , Damian C. Onwudiwe
Coal fly ash, an industrial solid waste product, and natural sand, a commonly available and inexpensive natural material, were used to fabricate ceramic membranes that are both affordable and sustainable. These ceramic membranes were fabricated by the uniaxial compaction technique using a manual hydraulic pressing machine. The effects of various fabrication parameters such as the sintering temperature and the amount of natural sand utilized, on the properties of the resulting ceramic membranes were extensively evaluated. X-ray fluorescence (XRF) analysis of the starting materials confirmed the presence of SiO2 and Al2O3, two key inorganic materials required for the fabrication of ceramic membranes. Heavy metals present in the raw coal fly ash were leached out prior to the fabrication process. The coal fly ash and natural sand were mixed in different proportions and the fabricated ceramic membranes were characterized using Fourier transform infrared spectroscopy (FTIR), Scanning electron microscope (SEM), X-ray diffraction (XRD), Energy-dispersive X-ray spectroscopy (EDS), and Thermogravimetric analysis (TGA). The properties of the optimized membranes were further studied to ascertain their mechanical strength, chemical stability, porosity, water absorption, water permeability, and shrinkage behaviour. The membrane fabricated with 20 wt% sand content and at 1000 °C sintering temperature had pore size of 0.64 µm and 34.7 % porosity, exhibited good mechanical strength (7.71 MPa), and exceptional chemical stability. The membrane also showed a remarkable water permeability of 32.23 L/m2/h. This study showed that natural sand and coal fly ash can be efficiently employed to develop a multifunctional filtration membrane with adjustable properties that can be utilized in water purification.
粉煤灰是一种工业固体废弃物，而天然砂则是一种常见且廉价的天然材料。这些陶瓷膜是利用手动液压机通过单轴压制技术制成的。我们广泛评估了烧结温度和天然砂用量等各种制造参数对陶瓷膜性能的影响。起始材料的 X 射线荧光 (XRF) 分析证实了 SiO2 和 Al2O3 的存在，这是制造陶瓷膜所需的两种关键无机材料。在制造过程之前，原煤粉煤灰中的重金属已被沥滤。将粉煤灰和天然砂以不同比例混合，并使用傅立叶变换红外光谱（FTIR）、扫描电子显微镜（SEM）、X 射线衍射（XRD）、能量色散 X 射线光谱（EDS）和热重分析（TGA）对制成的陶瓷膜进行表征。对优化膜的性能进行了进一步研究，以确定其机械强度、化学稳定性、孔隙率、吸水性、透水性和收缩行为。砂含量为 20 wt%、烧结温度为 1000 °C 的膜孔径为 0.64 µm，孔隙率为 34.7%，具有良好的机械强度（7.71 MPa）和优异的化学稳定性。该膜的透水性也非常出色，达到 32.23 升/平方米/小时。这项研究表明，可以有效地利用天然砂和粉煤灰来开发一种性能可调的多功能过滤膜，可用于水净化。
{"title":"Fabrication and characterization of low-cost ceramic membranes from coal fly ash and natural sand","authors":"Lawrence Sawunyama , Opeyemi A. Oyewo , Mokgadi F. Bopape , Damian C. Onwudiwe","doi":"10.1016/j.scenv.2024.100165","DOIUrl":"10.1016/j.scenv.2024.100165","url":null,"abstract":"<div><div>Coal fly ash, an industrial solid waste product, and natural sand, a commonly available and inexpensive natural material, were used to fabricate ceramic membranes that are both affordable and sustainable. These ceramic membranes were fabricated by the uniaxial compaction technique using a manual hydraulic pressing machine. The effects of various fabrication parameters such as the sintering temperature and the amount of natural sand utilized, on the properties of the resulting ceramic membranes were extensively evaluated. X-ray fluorescence (XRF) analysis of the starting materials confirmed the presence of SiO<sub>2</sub> and Al<sub>2</sub>O<sub>3</sub>, two key inorganic materials required for the fabrication of ceramic membranes. Heavy metals present in the raw coal fly ash were leached out prior to the fabrication process. The coal fly ash and natural sand were mixed in different proportions and the fabricated ceramic membranes were characterized using Fourier transform infrared spectroscopy (FTIR), Scanning electron microscope (SEM), X-ray diffraction (XRD), Energy-dispersive X-ray spectroscopy (EDS), and Thermogravimetric analysis (TGA). The properties of the optimized membranes were further studied to ascertain their mechanical strength, chemical stability, porosity, water absorption, water permeability, and shrinkage behaviour. The membrane fabricated with 20 wt% sand content and at 1000 °C sintering temperature had pore size of 0.64 µm and 34.7 % porosity, exhibited good mechanical strength (7.71 MPa), and exceptional chemical stability. The membrane also showed a remarkable water permeability of 32.23 L/m<sup>2</sup>/h. This study showed that natural sand and coal fly ash can be efficiently employed to develop a multifunctional filtration membrane with adjustable properties that can be utilized in water purification.</div></div>","PeriodicalId":101196,"journal":{"name":"Sustainable Chemistry for the Environment","volume":"8 ","pages":"Article 100165"},"PeriodicalIF":0.0,"publicationDate":"2024-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142432353","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-09-30DOI: 10.1016/j.scenv.2024.100167
Eva Naughton, James A. Sullivan
Surface Plasmonic Resonance (SPR) is the oscillation of free electrons on the surface of a metal or metallic particle upon irradiation with light of a certain frequency. The incorporation of Fe2O3 (a H2O oxidising photocatalyst) with plasmonic RuO2 nanoparticles to form a composite is studied. XRD results show that RuO2 is formed in the rutile phase while Fe2O3 is rhombohedral and also suggests doping of the Fe2O3 lattice with Ru atoms in the composite. UV-Vis spectroscopy shows that RuO2 exhibits a plasmon peak at 511 nm, and CO2-TPD experiments show that RuO2 adsorbs and desorbs CO2. TEM also shows that the RuO2 particles are spherical, as are the Fe2O3 particles with some irregular polyhedra present, too. The composite is a mixture of these two morphologies. The effect of composite formation on the activity of the materials in the artificial photosynthesis reaction is dramatic. Neither RuO2 nor Fe2O3 alone produce significant quantities of gaseous CH4 or CO products. However, the composite material produces both (as well as generating levels of unidentified adsorbed hydrocarbonaceous species). This reactivity is ascribed to the generation of a heterojunction in the composite material. It is suggested that the generation of holes in Fe2O3 is used to provide protons (from H2O oxidation), and the decay of an SPR response on RuO2 provides hot electrons, which together with the protons reduce CO2 to produce CH4, CO and adsorbed hydrocarbonaceous species.
{"title":"Influence of the presence of RuO2 on the reactivity of Fe2O3 in the artificial photosynthesis reaction","authors":"Eva Naughton, James A. Sullivan","doi":"10.1016/j.scenv.2024.100167","DOIUrl":"10.1016/j.scenv.2024.100167","url":null,"abstract":"<div><div>Surface Plasmonic Resonance (SPR) is the oscillation of free electrons on the surface of a metal or metallic particle upon irradiation with light of a certain frequency. The incorporation of Fe<sub>2</sub>O<sub>3</sub> (a H<sub>2</sub>O oxidising photocatalyst) with plasmonic RuO<sub>2</sub> nanoparticles to form a composite is studied. XRD results show that RuO<sub>2</sub> is formed in the rutile phase while Fe<sub>2</sub>O<sub>3</sub> is rhombohedral and also suggests doping of the Fe<sub>2</sub>O<sub>3</sub> lattice with Ru atoms in the composite. UV-Vis spectroscopy shows that RuO<sub>2</sub> exhibits a plasmon peak at 511 nm, and CO<sub>2</sub>-TPD experiments show that RuO<sub>2</sub> adsorbs and desorbs CO<sub>2</sub>. TEM also shows that the RuO<sub>2</sub> particles are spherical, as are the Fe<sub>2</sub>O<sub>3</sub> particles with some irregular polyhedra present, too. The composite is a mixture of these two morphologies. The effect of composite formation on the activity of the materials in the artificial photosynthesis reaction is dramatic. Neither RuO<sub>2</sub> nor Fe<sub>2</sub>O<sub>3</sub> alone produce significant quantities of gaseous CH<sub>4</sub> or CO products. However, the composite material produces both (as well as generating levels of unidentified adsorbed hydrocarbonaceous species). This reactivity is ascribed to the generation of a heterojunction in the composite material. It is suggested that the generation of holes in Fe<sub>2</sub>O<sub>3</sub> is used to provide protons (from H<sub>2</sub>O oxidation), and the decay of an SPR response on RuO<sub>2</sub> provides hot electrons, which together with the protons reduce CO<sub>2</sub> to produce CH<sub>4</sub>, CO and adsorbed hydrocarbonaceous species.</div></div>","PeriodicalId":101196,"journal":{"name":"Sustainable Chemistry for the Environment","volume":"8 ","pages":"Article 100167"},"PeriodicalIF":0.0,"publicationDate":"2024-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142417940","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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