Iron and nitrogen co-doped carbon (Fe-N-C) with Fe-Nx and graphitic N sites shows great potential in persulfate (PS) activation for organic pollutants degradation. Fe-Nx and graphitic N sites were quantified by X-ray photoelectron spectroscopy (XPS) to determine their ratios. The interaction between Fe-Nx and graphitic N and the mechanism affecting the catalytic activity were systematically explored by combining experiments and theoretical calculations. The results indicated a significant synergistic effect between Fe-Nx and graphitic N. Especially, Fe-N-C with a 1:4 ratio of Fe-Nx to graphitic N owned the highest turnover frequency (TOF) value (1.59 × 10−3 g m−2 min−1). The contributions of radical mechanism influenced TOF values of Fe-N-C-rx to a certain extent. Theoretical calculations proved that the coordination environment could regulate the electronic structure of active sites, thereby affecting catalytic activity. Fe-N-C with a ratio of 1:4 Fe-Nx to graphitic N had maximum adsorption energy (Eads), O-O bond length (lO-O) and the optimal d-band center value, which promoted adsorption and electron transfer with PS. The 2,4-Dichlorophenol (2,4-DCP) degradation behavior was also explored by combining Fukui functions and mass spectrometry analysis.
具有 Fe-Nx 和石墨 N 位点的铁氮共掺杂碳（Fe-N-C）在过硫酸盐（PS）活化降解有机污染物方面具有巨大潜力。通过 X 射线光电子能谱（XPS）对铁-氮和石墨 N 位点进行量化，以确定它们的比例。结合实验和理论计算，系统地探讨了 Fe-Nx 和石墨 N 之间的相互作用以及影响催化活性的机理。结果表明，Fe-Nx 与石墨 N 之间存在明显的协同效应，尤其是 Fe-Nx 与石墨 N 的比例为 1:4 的 Fe-N-C 具有最高的翻转频率（TOF）值（1.59 × 10-3 g m-2 min-1）。自由基机制的贡献在一定程度上影响了 Fe-N-C-rx 的 TOF 值。理论计算证明，配位环境可以调节活性位点的电子结构，从而影响催化活性。Fe-Nx 与石墨 N 的比例为 1:4 的 Fe-N-C 具有最大的吸附能（Eads）、O-O 键长度（lO-O）和最佳的 d 带中心值，从而促进了与 PS 的吸附和电子转移。此外，还结合福井函数和质谱分析，探讨了 2,4-DCP 的降解行为。
{"title":"Persulfate activation by Fe, N co-doped carbon: Effect of N-containing groups on electron structure of Fe-Nx sites","authors":"Qin Wen , Fei Qi , Shizong Wang , Zequan Zeng , Zhanggen Huang","doi":"10.1016/j.efmat.2024.09.001","DOIUrl":"10.1016/j.efmat.2024.09.001","url":null,"abstract":"<div><div>Iron and nitrogen co-doped carbon (Fe-N-C) with Fe-N<sub><em>x</em></sub> and graphitic N sites shows great potential in persulfate (PS) activation for organic pollutants degradation. Fe-N<sub><em>x</em></sub> and graphitic N sites were quantified by X-ray photoelectron spectroscopy (XPS) to determine their ratios. The interaction between Fe-N<sub><em>x</em></sub> and graphitic N and the mechanism affecting the catalytic activity were systematically explored by combining experiments and theoretical calculations. The results indicated a significant synergistic effect between Fe-N<sub><em>x</em></sub> and graphitic N. Especially, Fe-N-C with a 1:4 ratio of Fe-N<sub><em>x</em></sub> to graphitic N owned the highest turnover frequency (TOF) value (1.59 × 10<sup>−3</sup> g m<sup>−2</sup> min<sup>−1</sup>). The contributions of radical mechanism influenced TOF values of Fe-N-C-rx to a certain extent. Theoretical calculations proved that the coordination environment could regulate the electronic structure of active sites, thereby affecting catalytic activity. Fe-N-C with a ratio of 1:4 Fe-N<sub><em>x</em></sub> to graphitic N had maximum adsorption energy (<em>E</em><sub>ads</sub>), O-O bond length (<em>l</em><sub>O-O</sub>) and the optimal d-band center value, which promoted adsorption and electron transfer with PS. The 2,4-Dichlorophenol (2,4-DCP) degradation behavior was also explored by combining Fukui functions and mass spectrometry analysis.</div></div>","PeriodicalId":100481,"journal":{"name":"Environmental Functional Materials","volume":"3 1","pages":"Pages 34-45"},"PeriodicalIF":0.0,"publicationDate":"2024-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142586854","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 : 2024-03-01DOI: 10.1016/j.efmat.2024.07.002
Xiaowen Yang, Ran Zhao, Hong Zhan, Hexiang Zhao, Yingnan Duan, Zhurui Shen
Titanium dioxide (TiO2), recognized for its affordability, low cost, high chemical stability, and eco-friendliness, has garnered extensive research attention in recent years. But because of the TiO2 band gap (>3.2eV) seriously limit the use of visible light, and fast electron-hole composite in TiO2 often lead to poor photocatalytic activity and low quantum yield. Therefore, TiO2 needs to be modified. Modification can change the broadband gap of TiO2, enhance light absorption, thus affect the important means of photocatalytic efficiency. In this review, we introduce the crystal form and photocatalytic mechanism of TiO2, and review some modification strategies of TiO2, including doping modification, construction of heterojunctions, crystal plane engineering and defect engineering. Furthermore, we review the application of modified TiO2-based photocatalytic materials in water treatment, including the removal of dye contaminants, antibiotics, advanced oxidative sterilization, and finally explore the challenges and prospects of modified TiO2-based photocatalysts.
{"title":"Modified Titanium dioxide-based photocatalysts for water treatment: Mini review","authors":"Xiaowen Yang, Ran Zhao, Hong Zhan, Hexiang Zhao, Yingnan Duan, Zhurui Shen","doi":"10.1016/j.efmat.2024.07.002","DOIUrl":"10.1016/j.efmat.2024.07.002","url":null,"abstract":"<div><div>Titanium dioxide (TiO<sub>2</sub>), recognized for its affordability, low cost, high chemical stability, and eco-friendliness, has garnered extensive research attention in recent years. But because of the TiO<sub>2</sub> band gap (>3.2eV) seriously limit the use of visible light, and fast electron-hole composite in TiO<sub>2</sub> often lead to poor photocatalytic activity and low quantum yield. Therefore, TiO<sub>2</sub> needs to be modified. Modification can change the broadband gap of TiO<sub>2</sub>, enhance light absorption, thus affect the important means of photocatalytic efficiency. In this review, we introduce the crystal form and photocatalytic mechanism of TiO<sub>2</sub>, and review some modification strategies of TiO<sub>2</sub>, including doping modification, construction of heterojunctions, crystal plane engineering and defect engineering. Furthermore, we review the application of modified TiO<sub>2</sub>-based photocatalytic materials in water treatment, including the removal of dye contaminants, antibiotics, advanced oxidative sterilization, and finally explore the challenges and prospects of modified TiO<sub>2</sub>-based photocatalysts.</div></div>","PeriodicalId":100481,"journal":{"name":"Environmental Functional Materials","volume":"3 1","pages":"Pages 1-12"},"PeriodicalIF":0.0,"publicationDate":"2024-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141706794","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 : 2024-03-01DOI: 10.1016/j.efmat.2024.06.001
The formidable challenge of membrane fouling by high-viscosity oils remains a primary impediment to the sustainable application of separation membranes in treating oil-contaminated wastewater. Consequently, there is an imperative for the development of oil-contaminated wastewater treatment membranes endowed with self-cleansing capabilities. The current review aims to delineate the landscape of self-cleansing membranes tailored for the treatment of oil-contaminated wastewater. Embarking from the foundational theories and benchmarks of self-cleansing, the self-cleansing functionalities were classified into active and passive modalities. We encapsulate the strides made in research, encompassing domains such as super-wettable surfaces, synchronously filtered self-cleansing, and post-filtration high-efficiency self-cleansing, while concurrently identifying extant constraints and prospective trajectories. By meticulously categorizing and dissecting self-cleansing functionalities, the aim of this work is delving into the fundamental tenets of self-cleansing within membranes intended for treating oil-contaminated wastewater, and furnishing guidance for the design and advancement of self-cleansing functionalities in oil-water separation membranes.
{"title":"Advance of self-cleaning separation membranes for oil-containing wastewater treatment","authors":"","doi":"10.1016/j.efmat.2024.06.001","DOIUrl":"10.1016/j.efmat.2024.06.001","url":null,"abstract":"<div><div>The formidable challenge of membrane fouling by high-viscosity oils remains a primary impediment to the sustainable application of separation membranes in treating oil-contaminated wastewater. Consequently, there is an imperative for the development of oil-contaminated wastewater treatment membranes endowed with self-cleansing capabilities. The current review aims to delineate the landscape of self-cleansing membranes tailored for the treatment of oil-contaminated wastewater. Embarking from the foundational theories and benchmarks of self-cleansing, the self-cleansing functionalities were classified into active and passive modalities. We encapsulate the strides made in research, encompassing domains such as super-wettable surfaces, synchronously filtered self-cleansing, and post-filtration high-efficiency self-cleansing, while concurrently identifying extant constraints and prospective trajectories. By meticulously categorizing and dissecting self-cleansing functionalities, the aim of this work is delving into the fundamental tenets of self-cleansing within membranes intended for treating oil-contaminated wastewater, and furnishing guidance for the design and advancement of self-cleansing functionalities in oil-water separation membranes.</div></div>","PeriodicalId":100481,"journal":{"name":"Environmental Functional Materials","volume":"3 1","pages":"Pages 72-93"},"PeriodicalIF":0.0,"publicationDate":"2024-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141399473","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 : 2024-03-01DOI: 10.1016/j.efmat.2024.07.001
Xing Chen , Ye Liu , Guoqiang Wang , Lei Zhang , Yubo Kuang , Haohan Tao , Xiaoqian Xiang , Guangran Di , Xiaojing Yin , Kaixin Wang , Qianqian Cai , Xiaojun Lv
Carbon dioxide, a significant greenhouse gas component, has been impacting the global climate. Photocatalytic CO2 reduction is a cost-effective and eco-friendly approach. Photocatalytic CO2 can combine with epoxides to produce cyclic carbonates, garnering considerable attention due to its full atom utilization and alignment with green chemistry principles. This review assesses the current state of research on photocatalytic CO2 cycloaddition with epoxides, examining factors influencing efficiency through pathways and enhancement methods like light absorption, separation and transfer of photogenerated charges, active site reaction, coupling reaction, and reaction device.
{"title":"Progress of CO2 fixation using cycloaddition reaction","authors":"Xing Chen , Ye Liu , Guoqiang Wang , Lei Zhang , Yubo Kuang , Haohan Tao , Xiaoqian Xiang , Guangran Di , Xiaojing Yin , Kaixin Wang , Qianqian Cai , Xiaojun Lv","doi":"10.1016/j.efmat.2024.07.001","DOIUrl":"10.1016/j.efmat.2024.07.001","url":null,"abstract":"<div><div>Carbon dioxide, a significant greenhouse gas component, has been impacting the global climate. Photocatalytic CO<sub>2</sub> reduction is a cost-effective and eco-friendly approach. Photocatalytic CO<sub>2</sub> can combine with epoxides to produce cyclic carbonates, garnering considerable attention due to its full atom utilization and alignment with green chemistry principles. This review assesses the current state of research on photocatalytic CO<sub>2</sub> cycloaddition with epoxides, examining factors influencing efficiency through pathways and enhancement methods like light absorption, separation and transfer of photogenerated charges, active site reaction, coupling reaction, and reaction device.</div></div>","PeriodicalId":100481,"journal":{"name":"Environmental Functional Materials","volume":"3 1","pages":"Pages 13-24"},"PeriodicalIF":0.0,"publicationDate":"2024-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141715715","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 : 2024-03-01DOI: 10.1016/j.efmat.2024.09.002
Rashda , Aaron Albert Aryee , Dai Kailu , Shumaila Kiran , Zhaohui Li , Runping Han
This study investigates the use of peanut husk biowaste (PH) activated carbon to remove 2,4-dichlorophenoxyacetic acid (2,4-D) and 4-chlorophenol (4-CP) from water. Acid activation of PH enhances its structure, creating pores in the activated carbon. SEM, TEM, and XRD confirm the effectiveness of this process. BET analysis shows the increase in surface area from 0.775 to 547 m2 g−1 for the PH and PH-AC samples. PH-AC tested against 2,4-D and 4-CP, optimizing pH, contact time, pollutant dose, PH-AC dose, and temperature for maximum adsorption efficiencies. Maximum adsorption capacity for 2,4-D and 4-CP is 165.9 and 99.4 mg g−1, respectively, higher than previous research. Kinetics, adsorption, and thermodynamic studies reveal the endothermic and spontaneous nature of the adsorption process. The adsorbent demonstrates stability and long-term applicability, with substantial adsorption capacities for four cycles. Cytotoxicity studies confirm non-toxicity and environmental friendliness of PH-AC material. These findings highlight the potential of PH-AC for wastewater treatment.
{"title":"Adsorption of 2,4-dichlorophenoxyacetic acid and 4-chlorophenol using bio-based activated carbon: Thermodynamics, kinetics and cytotoxicity evaluation","authors":"Rashda , Aaron Albert Aryee , Dai Kailu , Shumaila Kiran , Zhaohui Li , Runping Han","doi":"10.1016/j.efmat.2024.09.002","DOIUrl":"10.1016/j.efmat.2024.09.002","url":null,"abstract":"<div><div>This study investigates the use of peanut husk biowaste (PH) activated carbon to remove 2,4-dichlorophenoxyacetic acid (2,4-D) and 4-chlorophenol (4-CP) from water. Acid activation of PH enhances its structure, creating pores in the activated carbon. SEM, TEM, and XRD confirm the effectiveness of this process. BET analysis shows the increase in surface area from 0.775 to 547 m<sup>2</sup> g<sup>−1</sup> for the PH and PH-AC samples. PH-AC tested against 2,4-D and 4-CP, optimizing pH, contact time, pollutant dose, PH-AC dose, and temperature for maximum adsorption efficiencies. Maximum adsorption capacity for 2,4-D and 4-CP is 165.9 and 99.4 mg g<sup>−1</sup>, respectively, higher than previous research. Kinetics, adsorption, and thermodynamic studies reveal the endothermic and spontaneous nature of the adsorption process. The adsorbent demonstrates stability and long-term applicability, with substantial adsorption capacities for four cycles. Cytotoxicity studies confirm non-toxicity and environmental friendliness of PH-AC material. These findings highlight the potential of PH-AC for wastewater treatment.</div></div>","PeriodicalId":100481,"journal":{"name":"Environmental Functional Materials","volume":"3 1","pages":"Pages 46-58"},"PeriodicalIF":0.0,"publicationDate":"2024-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142586855","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 : 2024-03-01DOI: 10.1016/j.efmat.2024.07.003
Ran Zhao , Xiao-Wen Yang , Tian-Hao Li , Tian-Miao Yu , Fang-Yuan Chen , Zhu-Rui Shen
In the past few years, there has been a widespread utilization of diatomic catalysts in the catalysis sector because of their distinct benefits. In this review, we specify the application of diatomic catalysts based on carbon and carbon nitride in the Fenton-like field. This paper focuses on the synthesis and characterization of homonuclear and heteronuclear diatomic catalysts and methods to improve the catalytic performance by optimizing d-band structure, tuning charge transfer, and constructing spin states. There is no doubt that diatomic catalysts have bright prospects in the Fenton-like field.
在过去几年中，由于二原子催化剂的独特优势，它们在催化领域得到了广泛应用。在这篇综述中，我们具体介绍了基于碳和氮化碳的二原子催化剂在类芬顿领域的应用。本文的重点是同核和异核二原子催化剂的合成和表征，以及通过优化 d 带结构、调整电荷转移和构建自旋态来提高催化性能的方法。毫无疑问，二原子催化剂在 Fenton-like 领域具有广阔的前景。
{"title":"The application of diatomic catalysts in advanced oxidation Fenton-like water treatment technology:A mini review","authors":"Ran Zhao , Xiao-Wen Yang , Tian-Hao Li , Tian-Miao Yu , Fang-Yuan Chen , Zhu-Rui Shen","doi":"10.1016/j.efmat.2024.07.003","DOIUrl":"10.1016/j.efmat.2024.07.003","url":null,"abstract":"<div><div>In the past few years, there has been a widespread utilization of diatomic catalysts in the catalysis sector because of their distinct benefits. In this review, we specify the application of diatomic catalysts based on carbon and carbon nitride in the Fenton-like field. This paper focuses on the synthesis and characterization of homonuclear and heteronuclear diatomic catalysts and methods to improve the catalytic performance by optimizing d-band structure, tuning charge transfer, and constructing spin states. There is no doubt that diatomic catalysts have bright prospects in the Fenton-like field.</div></div>","PeriodicalId":100481,"journal":{"name":"Environmental Functional Materials","volume":"3 1","pages":"Pages 59-71"},"PeriodicalIF":0.0,"publicationDate":"2024-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141845102","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 : 2024-03-01DOI: 10.1016/j.efmat.2024.07.004
Shengquan Liu , Peng Li , Yuezhong Zhang , Xinli Gao , Guoyong Wang , Sufang Song , Xudong Zhao
Developing highly efficient adsorbents is one of the most feasible strategies to achieve oil-water separation. Herein, we exploited a new hydrophobic metal-organic framework (MOF) by a post-synthesis acid-exchange method. Pentadecafluorooctanoic acid (PFOA) was applied to substitute the acetic acid of MOF-808 to result in the fluorinated MOF-808-PFOA, which owns much larger water contact angle than the primary MOF-808. Further, we successfully loaded these sub-micron MOF-808-PFOA particles into a melamine (MA) sponge, via the crosslinking effect by polydimethylsiloxane (PDMS). The prepared MOF/PDMS/MA sponge shows a high contact angle of 151.9°, induced by the increased surface roughness of mesh filament and decreased surface energy. Meanwhile, it is found that this excellent hydrophobility remains well under different water media and pH values. Combining with the high hydrophobiclity, mechanical stability and porous structure, this sponge shows an excellent adsorption performance for various classes of organic oils, with the large saturated adsorption capacities (27–65 g g−1), short equilibrium time (∼3 s), and good recyclability. More interestingly, this sponge can serve as a filter cartridge to achieve the effective continuous oil-water separation, even under long-term use. Thus, our work provides a new sponge-based adsorbent for efficient oil-water separation, and proposes a feasible strategy to construct hydrophobic MOFs via post-synthesis methods.
{"title":"Hydrophobic MOF-808 particles encapsulated melamine sponge for efficient oil-water separation","authors":"Shengquan Liu , Peng Li , Yuezhong Zhang , Xinli Gao , Guoyong Wang , Sufang Song , Xudong Zhao","doi":"10.1016/j.efmat.2024.07.004","DOIUrl":"10.1016/j.efmat.2024.07.004","url":null,"abstract":"<div><div>Developing highly efficient adsorbents is one of the most feasible strategies to achieve oil-water separation. Herein, we exploited a new hydrophobic metal-organic framework (MOF) by a post-synthesis acid-exchange method. Pentadecafluorooctanoic acid (PFOA) was applied to substitute the acetic acid of MOF-808 to result in the fluorinated MOF-808-PFOA, which owns much larger water contact angle than the primary MOF-808. Further, we successfully loaded these sub-micron MOF-808-PFOA particles into a melamine (MA) sponge, <em>via</em> the crosslinking effect by polydimethylsiloxane (PDMS). The prepared MOF/PDMS/MA sponge shows a high contact angle of 151.9°, induced by the increased surface roughness of mesh filament and decreased surface energy. Meanwhile, it is found that this excellent hydrophobility remains well under different water media and pH values. Combining with the high hydrophobiclity, mechanical stability and porous structure, this sponge shows an excellent adsorption performance for various classes of organic oils, with the large saturated adsorption capacities (27–65 g g<sup>−1</sup>), short equilibrium time (∼3 s), and good recyclability. More interestingly, this sponge can serve as a filter cartridge to achieve the effective continuous oil-water separation, even under long-term use. Thus, our work provides a new sponge-based adsorbent for efficient oil-water separation, and proposes a feasible strategy to construct hydrophobic MOFs <em>via</em> post-synthesis methods.</div></div>","PeriodicalId":100481,"journal":{"name":"Environmental Functional Materials","volume":"3 1","pages":"Pages 25-33"},"PeriodicalIF":0.0,"publicationDate":"2024-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142586853","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 : 2023-12-01DOI: 10.1016/j.efmat.2024.03.001
Zohra Farid, Meryem Assimeddine, Mohamed Abdennouri, Noureddine Barka, M'hamed Sadiq
The present work attempts to highlight different facets of corn starch as an environmentally friendly depressant using soybean oil as a collector. The important influence of parameters such as pH, collector and depressant dosage, and the role of the depressant are discussed. The grade (%P2O5) of the flotation products were analyzed by means of UV–visible spectroscopy, the recovery (%Re) and the efficiency (%E) of the flotation products are calculated based on the grade. The mechanism of action of starch depression was revealed through inductive coupled plasma (ICP), Fourier transform infrared (FT-IR) spectroscopy, and X-ray diffraction (XRD). In addition, full factorial design (FFD) and artificial neural network (ANN) were used to generate an evaluation approach for P2O5 content. Moreover, the results obtained confirm that starch has an influence on phosphate depression at more acidic and alkaline pH. Indeed, at pH = 4, a P2O5 content of 28.29% was obtained with a recovery of 87.46% in the non-floating fraction. Similarly, at pH = 12, a content of 27.60% P2O5 with a recovery of 92.10% was found at a CaO/P2O5 ratio equal to 1.6. These concentrates were obtained from a feed sample containing 22.09% P2O5 using 10.3 g/L of soybean oil and 15 g/L of corn starch. The results of the comparison between the ANN and FFD approaches show that the ANN model outperforms the FFD model in terms of performance, with a good and higher coefficient of determination (R2 = 0.999).
{"title":"Flotation Enhancement of sedimentary phosphate ores by cornstarch as an environmental depressant: Modeling and analysis using full factorial design (FFD) and artificial neural network (ANN) approaches","authors":"Zohra Farid, Meryem Assimeddine, Mohamed Abdennouri, Noureddine Barka, M'hamed Sadiq","doi":"10.1016/j.efmat.2024.03.001","DOIUrl":"10.1016/j.efmat.2024.03.001","url":null,"abstract":"<div><div>The present work attempts to highlight different facets of corn starch as an environmentally friendly depressant using soybean oil as a collector. The important influence of parameters such as pH, collector and depressant dosage, and the role of the depressant are discussed. The grade (%P<sub>2</sub>O<sub>5</sub>) of the flotation products were analyzed by means of UV–visible spectroscopy, the recovery (%Re) and the efficiency (%E) of the flotation products are calculated based on the grade. The mechanism of action of starch depression was revealed through inductive coupled plasma (ICP), Fourier transform infrared (FT-IR) spectroscopy, and X-ray diffraction (XRD). In addition, full factorial design (FFD) and artificial neural network (ANN) were used to generate an evaluation approach for P<sub>2</sub>O<sub>5</sub> content. Moreover, the results obtained confirm that starch has an influence on phosphate depression at more acidic and alkaline pH. Indeed, at pH = 4, a P<sub>2</sub>O<sub>5</sub> content of 28.29% was obtained with a recovery of 87.46% in the non-floating fraction. Similarly, at pH = 12, a content of 27.60% P<sub>2</sub>O<sub>5</sub> with a recovery of 92.10% was found at a CaO/P<sub>2</sub>O<sub>5</sub> ratio equal to 1.6. These concentrates were obtained from a feed sample containing 22.09% P<sub>2</sub>O<sub>5</sub> using 10.3 g/L of soybean oil and 15 g/L of corn starch. The results of the comparison between the ANN and FFD approaches show that the ANN model outperforms the FFD model in terms of performance, with a good and higher coefficient of determination (R<sup>2</sup> = 0.999).</div></div>","PeriodicalId":100481,"journal":{"name":"Environmental Functional Materials","volume":"2 3","pages":"Pages 243-254"},"PeriodicalIF":0.0,"publicationDate":"2023-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140406900","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}
Two-dimensional (2D) materials have garnered a lot of attention in recent times due to their wide applicability in various areas. These materials exhibit a unique combination of structural and chemical characteristics that have shown promising results and have benefitted almost all the scientific fields including environmental science, engineering, material science, food and agriculture, medical and healthcare, information technology, and many more. These emerging materials have undoubtedly provided new perspectives and solutions to many pressing environmental problems such as the production of clean water through photothermal evaporation, nanosensors to detect the presence of pathogens or toxic materials, and gas-separation devices, to name a few, and hope to continue to do so in the future. Graphene and its derivatives have been the subject of research investigations for the last many years, and the majority of the literature is focused on this 2D material. Other members of the 2D group are less explored and discussed, which generates the literature gap in this field. To fill this knowledge gap, a thorough examination of the environmental applications of some of the recently developed 2D materials - aside from graphene - has been discussed. Although many 2D materials have been extensively discussed by various researchers and are reported in the literature, we have focused on transition metal dichalcogenides (TMDs), metal oxides, MXenes, and Xenes. Metal oxide-based nanomaterials such as nanosized iron oxides, manganese oxides, titanium oxides, zinc oxides, cerium oxides, magnesium oxides, zirconium oxides, and aluminium oxides are not present in 2D form yet they play a pivotal role in numerous environmental applications. In the present review, authors have tried to summarize the environmental applications, considering the size, structure, and various properties (molecular, optical, electrical, and magnetic) of these nanomaterials. This study also highlights the fascinating potential of these materials to strengthen our surroundings in the face of contemporary challenges, and may also advance the debate by describing likely future breakthroughs as well as obstacles in the search for sustainable and environment friendly technologies.
{"title":"Environmental resilience with 2D materials: A futuristic perspective","authors":"Shramila Yadav , Banty Kumar , Mohan Kumar , Yudhvir S. Sharma , Shikha Kaushik","doi":"10.1016/j.efmat.2024.04.001","DOIUrl":"10.1016/j.efmat.2024.04.001","url":null,"abstract":"<div><div>Two-dimensional (2D) materials have garnered a lot of attention in recent times due to their wide applicability in various areas. These materials exhibit a unique combination of structural and chemical characteristics that have shown promising results and have benefitted almost all the scientific fields including environmental science, engineering, material science, food and agriculture, medical and healthcare, information technology, and many more. These emerging materials have undoubtedly provided new perspectives and solutions to many pressing environmental problems such as the production of clean water through photothermal evaporation, nanosensors to detect the presence of pathogens or toxic materials, and gas-separation devices, to name a few, and hope to continue to do so in the future. Graphene and its derivatives have been the subject of research investigations for the last many years, and the majority of the literature is focused on this 2D material. Other members of the 2D group are less explored and discussed, which generates the literature gap in this field. To fill this knowledge gap, a thorough examination of the environmental applications of some of the recently developed 2D materials - aside from graphene - has been discussed. Although many 2D materials have been extensively discussed by various researchers and are reported in the literature, we have focused on transition metal dichalcogenides (TMDs), metal oxides, MXenes, and Xenes. Metal oxide-based nanomaterials such as nanosized iron oxides, manganese oxides, titanium oxides, zinc oxides, cerium oxides, magnesium oxides, zirconium oxides, and aluminium oxides are not present in 2D form yet they play a pivotal role in numerous environmental applications. In the present review, authors have tried to summarize the environmental applications, considering the size, structure, and various properties (molecular, optical, electrical, and magnetic) of these nanomaterials. This study also highlights the fascinating potential of these materials to strengthen our surroundings in the face of contemporary challenges, and may also advance the debate by describing likely future breakthroughs as well as obstacles in the search for sustainable and environment friendly technologies.</div></div>","PeriodicalId":100481,"journal":{"name":"Environmental Functional Materials","volume":"2 3","pages":"Pages 228-242"},"PeriodicalIF":0.0,"publicationDate":"2023-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141030803","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 : 2023-12-01DOI: 10.1016/j.efmat.2024.05.001
Kai Miao , Shuangnan Li , Yingchao Zhang , Quansheng Liu , Yang Wu , Peipei Liu , Haitao Xu , Shukun Le , Chengzhang Zhu
The rapid development of industrialization and urbanization has led to serious environmental pollution. As an environmentally friendly and sustainable energy source, solar-driven semiconductor photocatalysis has been widely applied in environmental remediation and antibacterial activity owing to its gentle reaction conditions. The use of CeO2-based nanomaterials in green energy production, CO2 conversion, pollutant degradation, and antibacterial is increasing. The photocatalytic performance of CeO2 can be enhanced by appropriate modification strategies that suppress the rapid recombination of electron-hole pairs. This paper provides a systematic introduction to various modification strategies for CeO2, and reviews the research progress of modified CeO2 materials in photocatalytic CO2 reduction, photocatalytic hydrogen evolution, heavy metal removal, photodegradation of organic pollutants, and antibacterial fields, finally offering perspectives on its future development direction.
{"title":"Recent progress of modified CeO2-based materials for photocatalytic environmental remediation and antibacterial activity","authors":"Kai Miao , Shuangnan Li , Yingchao Zhang , Quansheng Liu , Yang Wu , Peipei Liu , Haitao Xu , Shukun Le , Chengzhang Zhu","doi":"10.1016/j.efmat.2024.05.001","DOIUrl":"10.1016/j.efmat.2024.05.001","url":null,"abstract":"<div><div>The rapid development of industrialization and urbanization has led to serious environmental pollution. As an environmentally friendly and sustainable energy source, solar-driven semiconductor photocatalysis has been widely applied in environmental remediation and antibacterial activity owing to its gentle reaction conditions. The use of CeO<sub>2</sub>-based nanomaterials in green energy production, CO<sub>2</sub> conversion, pollutant degradation, and antibacterial is increasing. The photocatalytic performance of CeO<sub>2</sub> can be enhanced by appropriate modification strategies that suppress the rapid recombination of electron-hole pairs. This paper provides a systematic introduction to various modification strategies for CeO<sub>2</sub>, and reviews the research progress of modified CeO<sub>2</sub> materials in photocatalytic CO<sub>2</sub> reduction, photocatalytic hydrogen evolution, heavy metal removal, photodegradation of organic pollutants, and antibacterial fields, finally offering perspectives on its future development direction.</div></div>","PeriodicalId":100481,"journal":{"name":"Environmental Functional Materials","volume":"2 3","pages":"Pages 213-227"},"PeriodicalIF":0.0,"publicationDate":"2023-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141058192","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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