Pub Date : 2025-02-04DOI: 10.1016/j.jece.2025.115679
Wan Amirah Najwa Wan Anuar , Ros Azlinawati Ramli , Marwa M. El-Sayed , Sudhir G. Warkar
Biodegradability and eco-friendliness are the most importance topic to consider in the development of new products. Commercial hydrogels for agriculture applications are made from fully synthetic polymers, which is non-biodegradable and harmful to environment. The utilization of polysaccharide in hydrogels production has sparked the rise of biodegradable hydrogels (BHs). However, using it alone results in poor mechanical properties and very fast degradation. Therefore, combining it with other materials as a composite is necessary. This article reviewed the development of BHs in the last 5 years. Classifications, materials resources, preparation methods, biodegradability of BHs, seeds germination and plant growth performance are critically investigated. Fundamental concepts such as definitions and application methods of BHs are described. Finally, important conclusions and outlook have been mentioned at the end of this article.
{"title":"Recent study on biodegradable hydrogels for agriculture application: A review","authors":"Wan Amirah Najwa Wan Anuar , Ros Azlinawati Ramli , Marwa M. El-Sayed , Sudhir G. Warkar","doi":"10.1016/j.jece.2025.115679","DOIUrl":"10.1016/j.jece.2025.115679","url":null,"abstract":"<div><div>Biodegradability and eco-friendliness are the most importance topic to consider in the development of new products. Commercial hydrogels for agriculture applications are made from fully synthetic polymers, which is non-biodegradable and harmful to environment. The utilization of polysaccharide in hydrogels production has sparked the rise of biodegradable hydrogels (BHs). However, using it alone results in poor mechanical properties and very fast degradation. Therefore, combining it with other materials as a composite is necessary. This article reviewed the development of BHs in the last 5 years. Classifications, materials resources, preparation methods, biodegradability of BHs, seeds germination and plant growth performance are critically investigated. Fundamental concepts such as definitions and application methods of BHs are described. Finally, important conclusions and outlook have been mentioned at the end of this article.</div></div>","PeriodicalId":15759,"journal":{"name":"Journal of Environmental Chemical Engineering","volume":"13 2","pages":"Article 115679"},"PeriodicalIF":7.4,"publicationDate":"2025-02-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143326392","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-02-04DOI: 10.1016/j.jece.2025.115696
Azeem Mustafa , Yong Shuai , Zhijiang Wang , Guene Lougou Bachirou , Mummad Rafique , Samia Razzaq , Muhamamd Ammad Nasir , Wei Wang , Enkhbayar Shagdar
To mitigate the most severe impacts of climate change, a fundamental transformation of our energy system from fossil fuels to low-carbon energy sources is imperative and essential for a sustainable future. Among the various conversion technologies, carbon dioxide (CO2) electrolysis is a promising approach for converting CO2 to energy-dense chemicals. However, the low-temperature CO2 electrolysis process is hindered by several challenges, including low energy efficiencies, poor selectivities, low catalytic activity, and stability, ultimately impacting its commercial viability. This has driven the development of high-temperature CO2 electrolysis in solid oxide electrolysis cells (SOECs), which offers enhanced carbon-oxygen bond activation, higher current densities, and improved energy efficiencies, making it a more viable alternative to low-temperature electrolysis. The present work provides a comprehensive investigation of the CO2 electrolysis process using SOEC, including a closer examination of the thermodynamic favorability of the process. We have reported novel insights into the critical roles of cathode, anode and electrolyte materials, revealing the opportunities for their enhancement and optimization. Additionally, the pressing issue of electrode degradation and reactivation strategies, as well as the degradation phenomena in the SOEC stack is discussed. Economic analysis is also incorporated to outline the techno-economic feasibility of this technology. Finally, future perspectives are included to highlight the important future considerations and provide a roadmap for this rapidly growing technology. By integrating these key aspects, the present work offers a more complete understanding of CO2 electrolysis in SOECs and identifies opportunities for future research and development.
{"title":"Theoretical insights into the factors affecting the electrochemical performance of solid oxide electrolysis cells for CO2 reduction","authors":"Azeem Mustafa , Yong Shuai , Zhijiang Wang , Guene Lougou Bachirou , Mummad Rafique , Samia Razzaq , Muhamamd Ammad Nasir , Wei Wang , Enkhbayar Shagdar","doi":"10.1016/j.jece.2025.115696","DOIUrl":"10.1016/j.jece.2025.115696","url":null,"abstract":"<div><div>To mitigate the most severe impacts of climate change, a fundamental transformation of our energy system from fossil fuels to low-carbon energy sources is imperative and essential for a sustainable future. Among the various conversion technologies, carbon dioxide (CO<sub>2</sub>) electrolysis is a promising approach for converting CO<sub>2</sub> to energy-dense chemicals. However, the low-temperature CO<sub>2</sub> electrolysis process is hindered by several challenges, including low energy efficiencies, poor selectivities, low catalytic activity, and stability, ultimately impacting its commercial viability. This has driven the development of high-temperature CO<sub>2</sub> electrolysis in solid oxide electrolysis cells (SOECs), which offers enhanced carbon-oxygen bond activation, higher current densities, and improved energy efficiencies, making it a more viable alternative to low-temperature electrolysis. The present work provides a comprehensive investigation of the CO<sub>2</sub> electrolysis process using SOEC, including a closer examination of the thermodynamic favorability of the process. We have reported novel insights into the critical roles of cathode, anode and electrolyte materials, revealing the opportunities for their enhancement and optimization. Additionally, the pressing issue of electrode degradation and reactivation strategies, as well as the degradation phenomena in the SOEC stack is discussed. Economic analysis is also incorporated to outline the techno-economic feasibility of this technology. Finally, future perspectives are included to highlight the important future considerations and provide a roadmap for this rapidly growing technology. By integrating these key aspects, the present work offers a more complete understanding of CO<sub>2</sub> electrolysis in SOECs and identifies opportunities for future research and development.</div></div>","PeriodicalId":15759,"journal":{"name":"Journal of Environmental Chemical Engineering","volume":"13 2","pages":"Article 115696"},"PeriodicalIF":7.4,"publicationDate":"2025-02-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143357337","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-02-03DOI: 10.1016/j.jece.2025.115691
Jingjing Yi , Jiadong Liu , Bo Gao , Longli Bo , Li Cao , Mika Sillanpää
Volatile organic compounds (VOCs) are an important factor contributing to air pollution and have received significant attention due to their toxicity and severe impact on the environment and human health. Catalytic oxidation technology has been widely recognized as an effective end-of-pipe control method for VOCs, which has been extensively studied in recent years to enhance catalyst activity, stability, and economic benefits. So, this review focuses on summarizing noble metal catalysts, non-noble metal and composite catalysts used in VOCs catalytic oxidation; analyzing factors influencing their catalytic activity and improvement methods; objectively evaluating the catalytic performance and key parameters of these catalysts; discussing the catalytic oxidation mechanism. Based on this comprehensive review, the development routes and strategies of catalysts preparing for VOC catalytic oxidation will be more explicit, while their application scenarios and parameters will be clearer.
{"title":"The comprehensive review of catalysts for catalytic oxidation of volatile organic compounds","authors":"Jingjing Yi , Jiadong Liu , Bo Gao , Longli Bo , Li Cao , Mika Sillanpää","doi":"10.1016/j.jece.2025.115691","DOIUrl":"10.1016/j.jece.2025.115691","url":null,"abstract":"<div><div>Volatile organic compounds (VOCs) are an important factor contributing to air pollution and have received significant attention due to their toxicity and severe impact on the environment and human health. Catalytic oxidation technology has been widely recognized as an effective end-of-pipe control method for VOCs, which has been extensively studied in recent years to enhance catalyst activity, stability, and economic benefits. So, this review focuses on summarizing noble metal catalysts, non-noble metal and composite catalysts used in VOCs catalytic oxidation; analyzing factors influencing their catalytic activity and improvement methods; objectively evaluating the catalytic performance and key parameters of these catalysts; discussing the catalytic oxidation mechanism. Based on this comprehensive review, the development routes and strategies of catalysts preparing for VOC catalytic oxidation will be more explicit, while their application scenarios and parameters will be clearer.</div></div>","PeriodicalId":15759,"journal":{"name":"Journal of Environmental Chemical Engineering","volume":"13 2","pages":"Article 115691"},"PeriodicalIF":7.4,"publicationDate":"2025-02-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143357338","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-02-01DOI: 10.1016/j.jece.2024.115017
Mirza Belal Beg , Labeeb Ali , Suryamol Nambyaruveettil , Florence H. Vermeire , Mohammednoor Altarawneh
Reducing methane emissions through complete catalytic oxidation at lower temperatures, using efficient and cost-effective catalysts, holds an importance in various industrial and environmental applications. In this study, we developed a series of bimetallic catalysts by incorporating nickel into ceria-doped cobalt oxide at varying loadings. These catalysts were thoroughly characterized to understand the impact of nickel incorporation on the catalytic performance, and subsequently tested for their efficiency in methane oxidation. To gain a comprehensive understanding of the catalysts' properties, a range of characterization techniques was employed, including X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FT-IR), scanning electron microscopy with energy-dispersive spectroscopy (SEM-EDS), nitrogen adsorption-desorption (BET), Raman spectroscopy, hydrogen temperature-programmed reduction (H2-TPR), and oxygen temperature-programmed desorption (O2-TPD). These methods provided insights into the physicochemical properties of the catalysts and the influence of nickel on their catalytic activity. The catalysts' performance in complete methane oxidation was evaluated in the range of 200–600°C. Water vapour (1.5 vol%) was introduced into the feed stream to study the impact of water vapour on the catalytic performance. Among the catalysts tested, the 15Co15NiCe catalyst exhibited the highest activity, achieving a T50 value at 389°C. The characterization results revealed that the optimal incorporation of nickel led to an increase in active surface oxygen species, the creation of lattice defects, an enlarged surface area, and enhanced reducibility, all of which contributed to an improved catalytic performance. Kinetic analysis showed that the calculated activation energy aligned with the observed methane oxidation activity trends. Furthermore, the best-performing catalyst demonstrated an exceptional stability over extended reaction times, with stability tests conducted over 12 hours revealing minimal variation in conversion efficiency. Post-reaction characterization of the spent catalyst using thermogravimetric analysis (TGA) and temperature-programmed oxidation (TPO) provided insights into the slight variations observed during the stability tests. The findings from this study pave the way for the development of low-temperature catalytic processes pretinent to catalytic oxidation of methane.
{"title":"Exploring the impact of Nickel on ceria doped Cobalt catalysts for low-temperature catalytic combustion of methane","authors":"Mirza Belal Beg , Labeeb Ali , Suryamol Nambyaruveettil , Florence H. Vermeire , Mohammednoor Altarawneh","doi":"10.1016/j.jece.2024.115017","DOIUrl":"10.1016/j.jece.2024.115017","url":null,"abstract":"<div><div>Reducing methane emissions through complete catalytic oxidation at lower temperatures, using efficient and cost-effective catalysts, holds an importance in various industrial and environmental applications. In this study, we developed a series of bimetallic catalysts by incorporating nickel into ceria-doped cobalt oxide at varying loadings. These catalysts were thoroughly characterized to understand the impact of nickel incorporation on the catalytic performance, and subsequently tested for their efficiency in methane oxidation. To gain a comprehensive understanding of the catalysts' properties, a range of characterization techniques was employed, including X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FT-IR), scanning electron microscopy with energy-dispersive spectroscopy (SEM-EDS), nitrogen adsorption-desorption (BET), Raman spectroscopy, hydrogen temperature-programmed reduction (H<sub>2</sub>-TPR), and oxygen temperature-programmed desorption (O<sub>2</sub>-TPD). These methods provided insights into the physicochemical properties of the catalysts and the influence of nickel on their catalytic activity. The catalysts' performance in complete methane oxidation was evaluated in the range of 200–600°C. Water vapour (1.5 vol%) was introduced into the feed stream to study the impact of water vapour on the catalytic performance. Among the catalysts tested, the 15Co15NiCe catalyst exhibited the highest activity, achieving a <em>T</em><sub>50</sub> value at 389°C. The characterization results revealed that the optimal incorporation of nickel led to an increase in active surface oxygen species, the creation of lattice defects, an enlarged surface area, and enhanced reducibility, all of which contributed to an improved catalytic performance. Kinetic analysis showed that the calculated activation energy aligned with the observed methane oxidation activity trends. Furthermore, the best-performing catalyst demonstrated an exceptional stability over extended reaction times, with stability tests conducted over 12 hours revealing minimal variation in conversion efficiency. Post-reaction characterization of the spent catalyst using thermogravimetric analysis (TGA) and temperature-programmed oxidation (TPO) provided insights into the slight variations observed during the stability tests. The findings from this study pave the way for the development of low-temperature catalytic processes pretinent to catalytic oxidation of methane.</div></div>","PeriodicalId":15759,"journal":{"name":"Journal of Environmental Chemical Engineering","volume":"13 1","pages":"Article 115017"},"PeriodicalIF":7.4,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143181250","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-02-01DOI: 10.1016/j.jece.2024.114978
Silan Li, Bo Wang, Zijing Liang, Liqiang Qi
With the increasingly stringent flue gas emission standards, water-sulfur poisoning has become one of the most pressing problems in the SCR process of coal-fired power plants.SO2 not only deactivates the catalyst, but also reacts with water and NH3 to form NH4HSO4, which then corrodes the equipment. Catalysts with water-sulfur tolerance urgently need to be developed. NH4H2PO4-modified V2O5-MoO3/TiO2 SCR catalysts is prepared by an improved wet impregnation method. The effect of P element modification on the denitration performance of the V2O5-MoO3/TiO2 SCR catalyst was studied, and the catalyst was characterized by XRD, BET, SEM, TEM, XPS, TPR, TPD and Raman. When the phosphorus doping amount was 0.6 % (wt%), the P0.6-SCR catalyst could achieve a NOx conversion rate of 95 %, and its optimal reaction temperature was 350 ℃. The characterization results show that the P element made the active components on the catalyst surface further dispersed, delayed the sintering of the catalyst at the calcination stage, and promoted the generation of B-acidic sites, enhances the surface acidity of the catalyst, and promotes the transition of VOx from a monomer state to a polymer state. Meanwhile, the P0.6-SCR catalyst exhibits outstanding sulfur resistance while ensuring high denitration efficiency.
{"title":"Insights into P-doping effect of the activity and anti-SO2/H2O poisoning of V2O5-MoO3/TiO2 catalysts for NH3-SCR","authors":"Silan Li, Bo Wang, Zijing Liang, Liqiang Qi","doi":"10.1016/j.jece.2024.114978","DOIUrl":"10.1016/j.jece.2024.114978","url":null,"abstract":"<div><div>With the increasingly stringent flue gas emission standards, water-sulfur poisoning has become one of the most pressing problems in the SCR process of coal-fired power plants.SO<sub>2</sub> not only deactivates the catalyst, but also reacts with water and NH<sub>3</sub> to form NH<sub>4</sub>HSO<sub>4</sub>, which then corrodes the equipment. Catalysts with water-sulfur tolerance urgently need to be developed. NH<sub>4</sub>H<sub>2</sub>PO<sub>4</sub>-modified V<sub>2</sub>O<sub>5</sub>-MoO<sub>3</sub>/TiO<sub>2</sub> SCR catalysts is prepared by an improved wet impregnation method. The effect of P element modification on the denitration performance of the V<sub>2</sub>O<sub>5</sub>-MoO<sub>3</sub>/TiO<sub>2</sub> SCR catalyst was studied, and the catalyst was characterized by XRD, BET, SEM, TEM, XPS, TPR, TPD and Raman. When the phosphorus doping amount was 0.6 % (wt%), the P<sub>0.6</sub>-SCR catalyst could achieve a NOx conversion rate of 95 %, and its optimal reaction temperature was 350 ℃. The characterization results show that the P element made the active components on the catalyst surface further dispersed, delayed the sintering of the catalyst at the calcination stage, and promoted the generation of B-acidic sites, enhances the surface acidity of the catalyst, and promotes the transition of VOx from a monomer state to a polymer state. Meanwhile, the P<sub>0.6</sub>-SCR catalyst exhibits outstanding sulfur resistance while ensuring high denitration efficiency.</div></div>","PeriodicalId":15759,"journal":{"name":"Journal of Environmental Chemical Engineering","volume":"13 1","pages":"Article 114978"},"PeriodicalIF":7.4,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143182630","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-02-01DOI: 10.1016/j.jece.2024.115000
Kexin Li , Jun Yao , Xiangmei Li , Shuqin Li , Zehai Li , Xilin Li , Hao Ling
The use of all-solid waste cementitious materials (ACM) in coal mine grouting backfill offers substantial green, low-carbon, and energy-saving benefits. This study systematically examines the effects of combining carbide slag (CS), fly ash (FA), and ground granulated blast furnace slag (GGBS) on the strength, workability, hydration characteristics, and microstructure of ACM. The utilization of sulfur-containing CS was achieved. The detrimental effects of delayed FA reaction and prolonged setting time can be mitigated by the introduction of high alkalinity or an increase in the Ca/Si ratio. The compressive strength may also be enhanced. The addition of excessive alkalinity (10 %) will result in a prolongation of the setting time. The primary hydration products include calcium aluminum silicate hydrate and magnesium-aluminum layered double hydroxide. Low Ca/Si ratios favor alkali metal ion charge balance, facilitating the transformation of silicate gels from single to double chains, while excessively high ratios reduce polymerization. Gmelinite forms when the (Ca+Na)/(Al+Si) ratio exceeds 1.6, and high NaOH concentrations inhibit ettringite formation. Validation shows that a GGBS:FA:CS= 3:1:3 mix with 4 % alkali binder (Group A2) meets mine grouting backfill criteria, with 80 % lower carbon emissions, 68 % lower energy intensity, and 50 % lower cost than cement. This research offers a viable pathway for the comprehensive utilization of multi-solid waste in mining applications.
{"title":"All-solid-waste cementitious materials for grouting: Effects of alkali content and elemental ratios on performance and sustainability","authors":"Kexin Li , Jun Yao , Xiangmei Li , Shuqin Li , Zehai Li , Xilin Li , Hao Ling","doi":"10.1016/j.jece.2024.115000","DOIUrl":"10.1016/j.jece.2024.115000","url":null,"abstract":"<div><div>The use of all-solid waste cementitious materials (ACM) in coal mine grouting backfill offers substantial green, low-carbon, and energy-saving benefits. This study systematically examines the effects of combining carbide slag (CS), fly ash (FA), and ground granulated blast furnace slag (GGBS) on the strength, workability, hydration characteristics, and microstructure of ACM. The utilization of sulfur-containing CS was achieved. The detrimental effects of delayed FA reaction and prolonged setting time can be mitigated by the introduction of high alkalinity or an increase in the Ca/Si ratio. The compressive strength may also be enhanced. The addition of excessive alkalinity (10 %) will result in a prolongation of the setting time. The primary hydration products include calcium aluminum silicate hydrate and magnesium-aluminum layered double hydroxide. Low Ca/Si ratios favor alkali metal ion charge balance, facilitating the transformation of silicate gels from single to double chains, while excessively high ratios reduce polymerization. Gmelinite forms when the (Ca+Na)/(Al+Si) ratio exceeds 1.6, and high NaOH concentrations inhibit ettringite formation. Validation shows that a GGBS:FA:CS= 3:1:3 mix with 4 % alkali binder (Group A2) meets mine grouting backfill criteria, with 80 % lower carbon emissions, 68 % lower energy intensity, and 50 % lower cost than cement. This research offers a viable pathway for the comprehensive utilization of multi-solid waste in mining applications.</div></div>","PeriodicalId":15759,"journal":{"name":"Journal of Environmental Chemical Engineering","volume":"13 1","pages":"Article 115000"},"PeriodicalIF":7.4,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143182633","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-02-01DOI: 10.1016/j.jece.2024.115050
Evgeny Naranov , Alexey Sadovnikov , Olga Arapova , Alexander Guda , Konstantin Dementev , Ashot Arzumanyan , Gleb Kubrin , Dmitry Kholodkov , Alexander Zagrebaev , Kaige Wang , Zhongyang Luo , Anton Maximov
Studying chemical production from biomass is essential for developing sustainable and eco-friendly alternatives to fossil-derived chemicals, reducing greenhouse gas emissions, and promoting a circular bioeconomy. In this study a new biomass upgrading route was proposed including extraction of phenolic fraction followed by catalytic hydroconversion and then dehydration to olefins. The conversion of bio-oil fraction into olefins was developed using a continuous-flow setup with two reactors for tandem hydrogenation – dehydration process (225 °C in the 1st reactor with 2 % Ru over titanosilicalite-1 (TS-1) catalyst, 160 °C in the 2nd reactor with BEA catalyst, 5 MPa H2, LHSV 1.5 h−1). The optimized mild conditions were determined for each stage of the catalytic conversion process, which allowed us to obtain cyclohexene from bio-oil-derived compounds with a selectivity of up to 70 %. The olefin fraction was further transformed to silicon-organic chemicals via hydrosilylation on Pt catalyst. Using in situ DRIFT technique and in situ X-ray absorption spectroscopy (XAS) we determined the mechanism of selective hydrodeoxygenation and evolution of Ru species.
{"title":"Production of chemicals via tandem conversion of bio-oil derived fractions","authors":"Evgeny Naranov , Alexey Sadovnikov , Olga Arapova , Alexander Guda , Konstantin Dementev , Ashot Arzumanyan , Gleb Kubrin , Dmitry Kholodkov , Alexander Zagrebaev , Kaige Wang , Zhongyang Luo , Anton Maximov","doi":"10.1016/j.jece.2024.115050","DOIUrl":"10.1016/j.jece.2024.115050","url":null,"abstract":"<div><div>Studying chemical production from biomass is essential for developing sustainable and eco-friendly alternatives to fossil-derived chemicals, reducing greenhouse gas emissions, and promoting a circular bioeconomy. In this study a new biomass upgrading route was proposed including extraction of phenolic fraction followed by catalytic hydroconversion and then dehydration to olefins. The conversion of bio-oil fraction into olefins was developed using a continuous-flow setup with two reactors for tandem hydrogenation – dehydration process (225 °C in the 1st reactor with 2 % Ru over titanosilicalite-1 (TS-1) catalyst, 160 °C in the 2nd reactor with BEA catalyst, 5 MPa H<sub>2</sub>, LHSV 1.5 h<sup>−1</sup>). The optimized mild conditions were determined for each stage of the catalytic conversion process, which allowed us to obtain cyclohexene from bio-oil-derived compounds with a selectivity of up to 70 %. The olefin fraction was further transformed to silicon-organic chemicals <em>via</em> hydrosilylation on Pt catalyst. Using <em>in situ</em> DRIFT technique and <em>in situ</em> X-ray absorption spectroscopy (XAS) we determined the mechanism of selective hydrodeoxygenation and evolution of Ru species.</div></div>","PeriodicalId":15759,"journal":{"name":"Journal of Environmental Chemical Engineering","volume":"13 1","pages":"Article 115050"},"PeriodicalIF":7.4,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143182642","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-02-01DOI: 10.1016/j.jece.2024.114990
Benjamin Tze-Wei Tan , Noor Hana Hanif Abu Bakar , Hooi Ling Lee
Per- and polyfluoroalkyl substances (PFAS) are compounds with thermodynamically robust carbon-fluorine (C-F) bonds that are found in various consumer products and industrial facilities. The persistence of these compounds poses a significant threat to the environment, resulting in water and soil contamination and a negative impact on human health. Therefore, various methods, such as adsorption, biological degradation, filtration and electrochemical have been developed to investigate the detection and complete remediation of PFAS from the environment. Among all the techniques used, electrochemical methods have been shown to be promising. In this review, the occurrences of PFAS in the environment and the implementation of electrochemical techniques (electrocoagulation (EC), electrochemical oxidation (EO) and electrosorption) for the treatment of PFAS are discussed. Along with those, a proposed degradation mechanism of PFAS by EO involving the cleavage of the C-F bonds of PFAS by Kolbe decarboxylation or desulfonation and oxidation to form short-chain PFAS molecules is also highlighted. In addition, the challenges encountered using these approaches and the adoption of different treatment systems, such as ultraviolet (UV), foam fractionation (FF) and adsorption with electrochemical methods to enhance the PFAS removal efficiency are presented. Nonetheless, the implementation of feasible approaches, evaluation of environmentally relevant concentrations of PFAS as well as assessment of the stability and durability of electrode materials are essential for the implementation of electrochemical techniques in full-scale applications.
{"title":"Electrochemical methods for treatment of per- and polyfluoroalkyl substances (PFAS): A review","authors":"Benjamin Tze-Wei Tan , Noor Hana Hanif Abu Bakar , Hooi Ling Lee","doi":"10.1016/j.jece.2024.114990","DOIUrl":"10.1016/j.jece.2024.114990","url":null,"abstract":"<div><div>Per- and polyfluoroalkyl substances (PFAS) are compounds with thermodynamically robust carbon-fluorine (C-F) bonds that are found in various consumer products and industrial facilities. The persistence of these compounds poses a significant threat to the environment, resulting in water and soil contamination and a negative impact on human health. Therefore, various methods, such as adsorption, biological degradation, filtration and electrochemical have been developed to investigate the detection and complete remediation of PFAS from the environment. Among all the techniques used, electrochemical methods have been shown to be promising. In this review, the occurrences of PFAS in the environment and the implementation of electrochemical techniques (electrocoagulation (EC), electrochemical oxidation (EO) and electrosorption) for the treatment of PFAS are discussed. Along with those, a proposed degradation mechanism of PFAS by EO involving the cleavage of the C-F bonds of PFAS by Kolbe decarboxylation or desulfonation and oxidation to form short-chain PFAS molecules is also highlighted. In addition, the challenges encountered using these approaches and the adoption of different treatment systems, such as ultraviolet (UV), foam fractionation (FF) and adsorption with electrochemical methods to enhance the PFAS removal efficiency are presented. Nonetheless, the implementation of feasible approaches, evaluation of environmentally relevant concentrations of PFAS as well as assessment of the stability and durability of electrode materials are essential for the implementation of electrochemical techniques in full-scale applications.</div></div>","PeriodicalId":15759,"journal":{"name":"Journal of Environmental Chemical Engineering","volume":"13 1","pages":"Article 114990"},"PeriodicalIF":7.4,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143182686","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-02-01DOI: 10.1016/j.jece.2024.115041
Shengtai Yan, Li Yang, Jingshu Ning, Yang Liu, Yunqi Cao, Fang Liu
Methane is a potent greenhouse gas, and mitigating its substantial emissions, primarily from coal mines with low concentrations, is among the most effective strategies to slow global warming. Catalytic combustion using transition metal oxides is increasingly pivotal in addressing this issue; however, the low-temperature activity of these catalysts limits their widespread application. In this study, we aimed to develop highly active and cost-effective catalysts for large-scale combustion of low-concentration methane. To this end, a series of transition metal oxides (Cr2O3, Mn2O3, Fe2O3, Co3O4, NiO, and CuO) supported on open cell foams were synthesized, and their catalytic performance for methane combustion at 1 vol% CH4 was assessed in a fixed-bed reactor. Comprehensive characterization was conducted using XRD, SEM-EDS, XPS, H2-TPR, and O2-TPD techniques to elucidate the underlying mechanisms of CH4 catalytic combustion. Results demonstrated that the structured catalysts exhibited exceptional activity and thermal stability. Among them, NiO showed the highest activity, followed by Fe2O3 and Co3O4 with similar activity, and then Mn2O3, CuO, and Cr2O3 showing progressively lower reactivities. Complete CH4 conversion was achieved over NiO at approximately 500 °C, comparable to certain noble metal catalysts. The superior catalytic activity was attributed to the abundant reactive oxygen species, originating from chemically adsorbed oxygen and surface lattice oxygen transformations. Additionally, the rich oxygen vacancies facilitated CH4 dissociation and enhanced activity. This study provides an effective framework for advancing catalyst design to improve methane oxidation efficiency, thereby enhancing the practical management and utilization of low-concentration methane emissions from coal mining activities.
{"title":"Catalytic combustion of low-concentration methane over transition metal oxides supported on open cell foams","authors":"Shengtai Yan, Li Yang, Jingshu Ning, Yang Liu, Yunqi Cao, Fang Liu","doi":"10.1016/j.jece.2024.115041","DOIUrl":"10.1016/j.jece.2024.115041","url":null,"abstract":"<div><div>Methane is a potent greenhouse gas, and mitigating its substantial emissions, primarily from coal mines with low concentrations, is among the most effective strategies to slow global warming. Catalytic combustion using transition metal oxides is increasingly pivotal in addressing this issue; however, the low-temperature activity of these catalysts limits their widespread application. In this study, we aimed to develop highly active and cost-effective catalysts for large-scale combustion of low-concentration methane. To this end, a series of transition metal oxides (Cr<sub>2</sub>O<sub>3</sub>, Mn<sub>2</sub>O<sub>3</sub>, Fe<sub>2</sub>O<sub>3</sub>, Co<sub>3</sub>O<sub>4</sub>, NiO, and CuO) supported on open cell foams were synthesized, and their catalytic performance for methane combustion at 1 vol% CH<sub>4</sub> was assessed in a fixed-bed reactor. Comprehensive characterization was conducted using XRD, SEM-EDS, XPS, H<sub>2</sub>-TPR, and O<sub>2</sub>-TPD techniques to elucidate the underlying mechanisms of CH<sub>4</sub> catalytic combustion. Results demonstrated that the structured catalysts exhibited exceptional activity and thermal stability. Among them, NiO showed the highest activity, followed by Fe<sub>2</sub>O<sub>3</sub> and Co<sub>3</sub>O<sub>4</sub> with similar activity, and then Mn<sub>2</sub>O<sub>3</sub>, CuO, and Cr<sub>2</sub>O<sub>3</sub> showing progressively lower reactivities. Complete CH<sub>4</sub> conversion was achieved over NiO at approximately 500 °C, comparable to certain noble metal catalysts. The superior catalytic activity was attributed to the abundant reactive oxygen species, originating from chemically adsorbed oxygen and surface lattice oxygen transformations. Additionally, the rich oxygen vacancies facilitated CH<sub>4</sub> dissociation and enhanced activity. This study provides an effective framework for advancing catalyst design to improve methane oxidation efficiency, thereby enhancing the practical management and utilization of low-concentration methane emissions from coal mining activities.</div></div>","PeriodicalId":15759,"journal":{"name":"Journal of Environmental Chemical Engineering","volume":"13 1","pages":"Article 115041"},"PeriodicalIF":7.4,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143182708","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-02-01DOI: 10.1016/j.jece.2024.115064
Ioannis Ioannidis, Eleni Antoniou, Ioannis Pashalidis
Polyethylene microplastics (PE-MPs) are among the most frequently found plastic pollutants, capable of adsorbing various contaminants such as radionuclides, raising potential environmental concerns as secondary pollutants. This study investigates the impact of natural organic matter (NOM), specifically humic acid (HA), on the adsorption of the U-232 radionuclide by HA-coated PE-MPs. The experiments were conducted in different pH regions (weak acidic, near neutral and weak alkaline), temperatures (25, 35, 45 °C) in deionized water solutions (DI), and in seawater samples. The surface coating of PE-MPs through HA enhances significantly their adsorption capacity for U-232, particularly under weakly acidic conditions. Batch adsorption experiments demonstrate that HA-coated MPs exhibit nearly 100 % adsorption efficiency at low pH, compared to only 25 % for non-treated PE-MPs. The adsorption process is found to be endothermic and entropy-driven, indicating that increasing temperature favors the adsorption capacity of the MPs. In seawater, the presence of competing ions decreases adsorption efficiency; however, HA-coated MPs still outperform their non-coated counterparts. These findings highlight the critical role of NOM coatings in enhancing the environmental stability and mobility of radionuclides and other pollutants by (PE-)MPs and underline the need to consider possible surface modifications in risk assessments related to MP polution.
{"title":"Enhanced radionuclide (U-232) adsorption by humic acid-coated microplastics","authors":"Ioannis Ioannidis, Eleni Antoniou, Ioannis Pashalidis","doi":"10.1016/j.jece.2024.115064","DOIUrl":"10.1016/j.jece.2024.115064","url":null,"abstract":"<div><div>Polyethylene microplastics (PE-MPs) are among the most frequently found plastic pollutants, capable of adsorbing various contaminants such as radionuclides, raising potential environmental concerns as secondary pollutants. This study investigates the impact of natural organic matter (NOM), specifically humic acid (HA), on the adsorption of the U-232 radionuclide by HA-coated PE-MPs. The experiments were conducted in different pH regions (weak acidic, near neutral and weak alkaline), temperatures (25, 35, 45 °C) in deionized water solutions (DI), and in seawater samples. The surface coating of PE-MPs through HA enhances significantly their adsorption capacity for U-232, particularly under weakly acidic conditions. Batch adsorption experiments demonstrate that HA-coated MPs exhibit nearly 100 % adsorption efficiency at low pH, compared to only 25 % for non-treated PE-MPs. The adsorption process is found to be endothermic and entropy-driven, indicating that increasing temperature favors the adsorption capacity of the MPs. In seawater, the presence of competing ions decreases adsorption efficiency; however, HA-coated MPs still outperform their non-coated counterparts. These findings highlight the critical role of NOM coatings in enhancing the environmental stability and mobility of radionuclides and other pollutants by (PE-)MPs and underline the need to consider possible surface modifications in risk assessments related to MP polution.</div></div>","PeriodicalId":15759,"journal":{"name":"Journal of Environmental Chemical Engineering","volume":"13 1","pages":"Article 115064"},"PeriodicalIF":7.4,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143182634","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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