{"title":"Enhancing the stability of Mn-based ion sieves via high-valence W doping for efficient lithium recovery from seawater","authors":"Enhui Liu, Haiyan Luo, Niankun Jiao, Weitao Zhang, Xin Zhou, Lianying Wu, Haoyu Yao, Xiangfeng Liang, Huizhou Liu","doi":"10.1016/j.seppur.2026.137110","DOIUrl":"https://doi.org/10.1016/j.seppur.2026.137110","url":null,"abstract":"","PeriodicalId":427,"journal":{"name":"Separation and Purification Technology","volume":"289 1","pages":""},"PeriodicalIF":8.6,"publicationDate":"2026-02-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146110311","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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 : 2026-02-04DOI: 10.1016/j.seppur.2026.137139
Bin Zhao, Bo Zhou, Peidong Zuo, Liping Chang, Mengmeng Wu, Chao Yang, Xu Wu, Zhifeng Qin
{"title":"Deciphering the multistage mechanistic landscape of COS removal by tertiary amines through combined experiments and molecular descriptors","authors":"Bin Zhao, Bo Zhou, Peidong Zuo, Liping Chang, Mengmeng Wu, Chao Yang, Xu Wu, Zhifeng Qin","doi":"10.1016/j.seppur.2026.137139","DOIUrl":"https://doi.org/10.1016/j.seppur.2026.137139","url":null,"abstract":"","PeriodicalId":427,"journal":{"name":"Separation and Purification Technology","volume":"8 1","pages":""},"PeriodicalIF":8.6,"publicationDate":"2026-02-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146110897","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
In the development of efficient catalysts for antibiotic degradation, catalyst recovery has long been a major challenge. Immobilizing advanced oxidation catalysts within porous biopolymer supports such as chitosan beads can effectively address this issue, but their cyclic stability remains a key focus of research. In this study, a novel chitosan aerogel microsphere embedded with cobalt‑iron layered double hydroxide (CS/CoFe LDH) was synthesized to efficiently activate peroxymonosulfate (PMS) to degrade tetracycline (TC). The CS/CoFe LDH aerogel microspheres constructed a three-dimensional porous network and contained abundant functional groups, thereby enhancing TC removal and facilitating catalyst recovery. Under optimal conditions, the CS/CoFe/PMS system achieved near-complete degradation of TC. The catalyst maintained high activity at pH 3–11 and in real water environments, with TC removal efficiency remaining above 82% even after five reuse cycles.Mechanistic investigations revealed that TC degradation was predominantly governed by a non-radical oxidation pathway, with superoxide radicals (·O2−) playing an auxiliary role, while hydroxyl radicals (·OH) and sulfate radicals (·SO4−) contributed to a lesser extent, indicating the coexistence of multiple oxidative pathways. The surface redox cycling of Co2+/Co3+ and Fe2+/Fe3+ was identified as the key mechanism for continuous PMS activation. Combined with liquid chromatography-mass spectrometry (LC-MS) and density functional theory (DFT) analysis, key intermediate products were identified, and degradation pathways involving demethylation, hydroxylation, ring cleavage, etc., were proposed. Toxicity predictions indicated that these intermediates were generally less harmful than TC, confirming the safety of the mineralization process. This work provides valuable mechanistic insights and demonstrates the application potential of aerogel-encapsulated LDH catalysts for water remediation and antibiotic removal.
{"title":"Chitosan aerogel beads embedded with CoFe layered double hydroxide for peroxymonosulfate activation","authors":"Wenjun Zeng, Yidan Luo, Shujuan He, Huiyin Ye, Yueyang Xiao, Shuohan Yu, Yu Xie, Mingshan Xue, Zuozhu Yin, Zugen Liu, Bin Gao","doi":"10.1016/j.seppur.2026.137149","DOIUrl":"https://doi.org/10.1016/j.seppur.2026.137149","url":null,"abstract":"In the development of efficient catalysts for antibiotic degradation, catalyst recovery has long been a major challenge. Immobilizing advanced oxidation catalysts within porous biopolymer supports such as chitosan beads can effectively address this issue, but their cyclic stability remains a key focus of research. In this study, a novel chitosan aerogel microsphere embedded with cobalt‑iron layered double hydroxide (CS/CoFe LDH) was synthesized to efficiently activate peroxymonosulfate (PMS) to degrade tetracycline (TC). The CS/CoFe LDH aerogel microspheres constructed a three-dimensional porous network and contained abundant functional groups, thereby enhancing TC removal and facilitating catalyst recovery. Under optimal conditions, the CS/CoFe/PMS system achieved near-complete degradation of TC. The catalyst maintained high activity at pH 3–11 and in real water environments, with TC removal efficiency remaining above 82% even after five reuse cycles.Mechanistic investigations revealed that TC degradation was predominantly governed by a non-radical oxidation pathway, with superoxide radicals (<strong>·O</strong><sub><strong>2</strong></sub><sup>−</sup>) playing an auxiliary role, while hydroxyl radicals (<strong>·OH</strong>) and sulfate radicals (<strong>·SO</strong><sub><strong>4</strong></sub><sup>−</sup>) contributed to a lesser extent, indicating the coexistence of multiple oxidative pathways. The surface redox cycling of Co<sup>2+</sup>/Co<sup>3+</sup> and Fe<sup>2+</sup>/Fe<sup>3+</sup> was identified as the key mechanism for continuous PMS activation. Combined with liquid chromatography-mass spectrometry (LC-MS) and density functional theory (DFT) analysis, key intermediate products were identified, and degradation pathways involving demethylation, hydroxylation, ring cleavage, etc., were proposed. Toxicity predictions indicated that these intermediates were generally less harmful than TC, confirming the safety of the mineralization process. This work provides valuable mechanistic insights and demonstrates the application potential of aerogel-encapsulated LDH catalysts for water remediation and antibiotic removal.","PeriodicalId":427,"journal":{"name":"Separation and Purification Technology","volume":"398 1","pages":""},"PeriodicalIF":8.6,"publicationDate":"2026-02-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146115826","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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 : 2026-02-04DOI: 10.1016/j.seppur.2026.137127
Ming Zhang, Jiacheng Li, Lijun Wu, Tian Liang, Jian Liu, Lu Wang
Acetamiprid (ACE) can accumulate in the environment through the food chain, potentially endanger human health. In this experiment, zinc‑cobalt bimetallic metal organic framework (Zn/Co MOF) was synthesized and used to activate peroxymonosulfate (PMS) for the removal of ACE from water. The degradation efficiency of ACE could achieve approximately 96.93% after 90 min. Through the synergistic effect of Zn and Co bimetallic sites, ACE was degraded via a Fenton-like reaction, while reactive oxygen species (SO4·-, ·OH, O2·-, and 1O2) participated in the process. The high catalytic activity of Zn/Co MOF led to the degradation of ACE through the formation of a series of low-toxicity intermediates, and partial mineralization to CO2 and H2O. In addition, Zn/Co MOF remained effective under broad pH conditions (pH 5–11) and temperatures (5–45 °C). This system had excellent degradation effects in actual water, with degradation rates of 95.42% and 95.18% after 90 min in the Pai River and Liren Lake, respectively. With its high catalytic performance, the Zn/Co MOF is expected to become an ideal catalyst that could be used to remove pesticide residues in water.
{"title":"One-step hydrothermal synthesis of Zn/Co MOF for efficiently activating PMS to degrade organic pollutants in water: The reaction kinetics and mechanism","authors":"Ming Zhang, Jiacheng Li, Lijun Wu, Tian Liang, Jian Liu, Lu Wang","doi":"10.1016/j.seppur.2026.137127","DOIUrl":"https://doi.org/10.1016/j.seppur.2026.137127","url":null,"abstract":"Acetamiprid (ACE) can accumulate in the environment through the food chain, potentially endanger human health. In this experiment, zinc‑cobalt bimetallic metal organic framework (Zn/Co MOF) was synthesized and used to activate peroxymonosulfate (PMS) for the removal of ACE from water. The degradation efficiency of ACE could achieve approximately 96.93% after 90 min. Through the synergistic effect of Zn and Co bimetallic sites, ACE was degraded via a Fenton-like reaction, while reactive oxygen species (SO<sub>4</sub><sup>·-</sup>, ·OH, O<sub>2</sub><sup>·-</sup>, and <sup>1</sup>O<sub>2</sub>) participated in the process. The high catalytic activity of Zn/Co MOF led to the degradation of ACE through the formation of a series of low-toxicity intermediates, and partial mineralization to CO<sub>2</sub> and H<sub>2</sub>O. In addition, Zn/Co MOF remained effective under broad pH conditions (pH 5–11) and temperatures (5–45 °C). This system had excellent degradation effects in actual water, with degradation rates of 95.42% and 95.18% after 90 min in the Pai River and Liren Lake, respectively. With its high catalytic performance, the Zn/Co MOF is expected to become an ideal catalyst that could be used to remove pesticide residues in water.","PeriodicalId":427,"journal":{"name":"Separation and Purification Technology","volume":"83 1","pages":"137127"},"PeriodicalIF":8.6,"publicationDate":"2026-02-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146135564","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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 : 2026-02-03DOI: 10.1016/j.seppur.2026.137138
Roberta Y.N. Reis, Alberto Rodríguez-Gómez, Caio V.S. Almeida, Lucia H. Mascaro, Manuel A. Rodrigo
Hydrogen sulfide (H2S) is a highly toxic and corrosive gas commonly found in industrial emissions, posing serious environmental and operational risks. This work proposes an innovative photoelectrocatalytic strategy for the simultaneous degradation of gaseous H2S and the generation of green hydrogen (H2) under flux conditions. The system integrates gas-liquid absorption with electrochemical and photoelectrochemical oxidation, employing a WO3 photoanode and a stainless steel cathode separated by a proton exchange membrane. The performance of the electrocatalytic and photoelectrocatalytic configurations was systematically evaluated regarding H2S removal efficiency, hydrogen production, and energy consumption. The photoelectrocatalytic process exhibited superior activity, achieving a degradation of 8.2 mg S with a Coulombic efficiency of 3600 mg S Ah−1 for H2S oxidation and a Faradaic efficiency of 60% for H2 evolution at an applied current density of 0.33 mA cm−2. Illumination with a 10 W high-power blue LED significantly increased charge separation and reduced the cell potential, resulting in higher energy efficiency. Post-reaction characterization by X-ray photoelectron spectroscopy (XPS) demonstrated partial sulfur deposition on the WO3 surface and the presence of oxidized sulfur species. Overall, the results demonstrate that photoelectrocatalysis under optimized conditions offers an efficient and sustainable route for simultaneous H2S reduction and hydrogen generation, providing a promising dual-purpose platform for environmental remediation and renewable energy production.
硫化氢（H2S）是一种剧毒腐蚀性气体，常见于工业排放中，具有严重的环境和操作风险。这项工作提出了一种创新的光电催化策略，用于在通量条件下同时降解气态H2S和生成绿色氢（H2）。该系统将气液吸收与电化学和光电化学氧化相结合，采用WO3光阳极和由质子交换膜分离的不锈钢阴极。系统地评估了电催化和光催化构型对H2S的去除效率、产氢量和能耗。光电催化过程表现出优异的活性，在0.33 mA cm−2的电流密度下，H2S氧化的库仑效率为3600 mg S Ah−1，降解8.2 mg S，氢气析出的法拉第效率为60%。10 W高功率蓝色LED的照明显著增加了电荷分离，降低了电池电位，从而提高了能源效率。反应后的x射线光电子能谱（XPS）表征表明，WO3表面有部分硫沉积，并且存在氧化硫。综上所述，优化条件下的光电催化为同时还原H2S和制氢提供了一条高效、可持续的途径，为环境修复和可再生能源生产提供了一个有前景的双用途平台。
{"title":"Enhancing hydrogen sulfide removal through photoelectrochemistry with WO3 photoanodes under blue LED irradiation","authors":"Roberta Y.N. Reis, Alberto Rodríguez-Gómez, Caio V.S. Almeida, Lucia H. Mascaro, Manuel A. Rodrigo","doi":"10.1016/j.seppur.2026.137138","DOIUrl":"https://doi.org/10.1016/j.seppur.2026.137138","url":null,"abstract":"Hydrogen sulfide (H<sub>2</sub>S) is a highly toxic and corrosive gas commonly found in industrial emissions, posing serious environmental and operational risks. This work proposes an innovative photoelectrocatalytic strategy for the simultaneous degradation of gaseous H<sub>2</sub>S and the generation of green hydrogen (H<sub>2</sub>) under flux conditions. The system integrates gas-liquid absorption with electrochemical and photoelectrochemical oxidation, employing a WO<sub>3</sub> photoanode and a stainless steel cathode separated by a proton exchange membrane. The performance of the electrocatalytic and photoelectrocatalytic configurations was systematically evaluated regarding H<sub>2</sub>S removal efficiency, hydrogen production, and energy consumption. The photoelectrocatalytic process exhibited superior activity, achieving a degradation of 8.2 mg S with a Coulombic efficiency of 3600 mg S Ah<sup>−1</sup> for H<sub>2</sub>S oxidation and a Faradaic efficiency of 60% for H<sub>2</sub> evolution at an applied current density of 0.33 mA cm<sup>−2</sup>. Illumination with a 10 W high-power blue LED significantly increased charge separation and reduced the cell potential, resulting in higher energy efficiency. Post-reaction characterization by X-ray photoelectron spectroscopy (XPS) demonstrated partial sulfur deposition on the WO<sub>3</sub> surface and the presence of oxidized sulfur species. Overall, the results demonstrate that photoelectrocatalysis under optimized conditions offers an efficient and sustainable route for simultaneous H<sub>2</sub>S reduction and hydrogen generation, providing a promising dual-purpose platform for environmental remediation and renewable energy production.","PeriodicalId":427,"journal":{"name":"Separation and Purification Technology","volume":"5 1","pages":""},"PeriodicalIF":8.6,"publicationDate":"2026-02-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146101344","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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 : 2026-02-03DOI: 10.1016/j.seppur.2026.137136
Cheng Tang, Jie Hu, Tingting Yue, Xiufeng Hu, Wei Yu, Hui Lei
Seawater desalination is a crucial approach to addressing global freshwater scarcity, especially in coastal and arid regions. Pervaporation (PV) offers high salt rejection and strong fouling resistance, but conventional PV membranes often suffer from limited permeate flow rates and temperature polarization. In this study, solar energy was integrated with PV by incorporating graphene oxide (GO) as a photothermal material to directly heat the membrane surface, thereby reducing energy consumption and enhancing permeation flux. The composite membrane comprises an electrospun polyacrylonitrile (PAN) support layer, a GO-based intermediate layer crosslinked with polyethyleneimine (PEI), and a sodium alginate (SA) selective top layer. The GO interlayer converts the solar energy into localized heat and enhances surface wettability, facilitating the development of a uniform and ultrathin SA separation layer, while concurrently enhancing the structural stability of the membrane. By optimizing GO loading and SA thickness, the membrane structure was tailored to increase permeate flux and maintain high salt rejection. The optimized SA(10)/PEI-GO(250)/PAN membrane delivered a stable water flux averaging 2.9–3.0 kg/m2·h, while maintaining a salt removal efficiency above 99.9%. Extended operational trials validated the long-term reliability of the system. These findings highlight the feasibility of solar-driven PV (SPV) composites as a low-energy and eco-friendly approach to saline water treatment.
{"title":"Harnessing Photothermal graphene oxide interlayers for high-flux solar-driven pervaporation desalination","authors":"Cheng Tang, Jie Hu, Tingting Yue, Xiufeng Hu, Wei Yu, Hui Lei","doi":"10.1016/j.seppur.2026.137136","DOIUrl":"https://doi.org/10.1016/j.seppur.2026.137136","url":null,"abstract":"Seawater desalination is a crucial approach to addressing global freshwater scarcity, especially in coastal and arid regions. Pervaporation (PV) offers high salt rejection and strong fouling resistance, but conventional PV membranes often suffer from limited permeate flow rates and temperature polarization. In this study, solar energy was integrated with PV by incorporating graphene oxide (GO) as a photothermal material to directly heat the membrane surface, thereby reducing energy consumption and enhancing permeation flux. The composite membrane comprises an electrospun polyacrylonitrile (PAN) support layer, a GO-based intermediate layer crosslinked with polyethyleneimine (PEI), and a sodium alginate (SA) selective top layer. The GO interlayer converts the solar energy into localized heat and enhances surface wettability, facilitating the development of a uniform and ultrathin SA separation layer, while concurrently enhancing the structural stability of the membrane. By optimizing GO loading and SA thickness, the membrane structure was tailored to increase permeate flux and maintain high salt rejection. The optimized SA(10)/PEI-GO(250)/PAN membrane delivered a stable water flux averaging 2.9–3.0 kg/m<sup>2</sup>·h, while maintaining a salt removal efficiency above 99.9%. Extended operational trials validated the long-term reliability of the system. These findings highlight the feasibility of solar-driven PV (SPV) composites as a low-energy and eco-friendly approach to saline water treatment.","PeriodicalId":427,"journal":{"name":"Separation and Purification Technology","volume":"1 1","pages":"137136"},"PeriodicalIF":8.6,"publicationDate":"2026-02-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146135567","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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 : 2026-02-02DOI: 10.1016/j.seppur.2026.137123
Chongjia Fang, Haixin Guo, Xinhua Qi
Solar-driven interfacial steam generation (ISSG) has emerged as an attractive option for decentralized desalination, as it localizes heat at the air-water interface, achieving high solar-to-vapor conversion efficiencies. Biomass-derived hydrogels are an intrinsically sustainable material. The combination of its rich functional groups, hierarchical porous structure, and water-polymer interactions leads to the formation of an extended three-dimensional evaporation interface, thereby enabling rapid capillary transport and active salt management. The present paper reviews the structure, properties, and performance of biomass hydrogel evaporators, establishing a framework that combines cross-linking chemistry (including physical cross-linking, covalent cross-linking, and dynamic covalent cross-linking) and network structures (including bi-networks, interpenetrating polymer networks (IPNs), and semi-IPNs) with the integration of device-level structures, such as bifacial, gradient, bionic, and micro-channel systems, as well as multilayer systems. This framework can be used to rationally target evaporation rate, energy efficiency, hypersaline tolerance and durability. We summarize how intrinsic functionalities, external functionalization (e.g. carboxylation, sulfonation and quaternization) and the careful addition of photothermal, ion-regulating and reinforcing fillers work together to increase spectral absorption, control ion transport via charge/porosity gradients and stabilize long-term operation. In addition to materials design, we identify the following bottlenecks: non-standardized testing, thermal accounting, and mechanical and chemical stability under extreme salinity and temperature. Based on these findings, we propose the following priorities: green, scalable fabrication; ‘strong’ dynamic bonds for adaptive resilience; and integrated modules that pair desalination with antibiofouling or photocatalytic polishing toward zero-liquid-discharge water management. This framework presents a feasible roadmap for developing robust, field-ready hydrogel evaporators by integrating sustainable chemistry with performance-guided architecture.
{"title":"Biomass-derived hydrogel evaporators for interfacial solar steam generation: crosslinking chemistry, hierarchical network architecture, and device-level strategies for salt-tolerant desalination","authors":"Chongjia Fang, Haixin Guo, Xinhua Qi","doi":"10.1016/j.seppur.2026.137123","DOIUrl":"https://doi.org/10.1016/j.seppur.2026.137123","url":null,"abstract":"Solar-driven interfacial steam generation (ISSG) has emerged as an attractive option for decentralized desalination, as it localizes heat at the air-water interface, achieving high solar-to-vapor conversion efficiencies. Biomass-derived hydrogels are an intrinsically sustainable material. The combination of its rich functional groups, hierarchical porous structure, and water-polymer interactions leads to the formation of an extended three-dimensional evaporation interface, thereby enabling rapid capillary transport and active salt management. The present paper reviews the structure, properties, and performance of biomass hydrogel evaporators, establishing a framework that combines cross-linking chemistry (including physical cross-linking, covalent cross-linking, and dynamic covalent cross-linking) and network structures (including bi-networks, interpenetrating polymer networks (IPNs), and semi-IPNs) with the integration of device-level structures, such as bifacial, gradient, bionic, and micro-channel systems, as well as multilayer systems. This framework can be used to rationally target evaporation rate, energy efficiency, hypersaline tolerance and durability. We summarize how intrinsic functionalities, external functionalization (e.g. carboxylation, sulfonation and quaternization) and the careful addition of photothermal, ion-regulating and reinforcing fillers work together to increase spectral absorption, control ion transport via charge/porosity gradients and stabilize long-term operation. In addition to materials design, we identify the following bottlenecks: non-standardized testing, thermal accounting, and mechanical and chemical stability under extreme salinity and temperature. Based on these findings, we propose the following priorities: green, scalable fabrication; ‘strong’ dynamic bonds for adaptive resilience; and integrated modules that pair desalination with antibiofouling or photocatalytic polishing toward zero-liquid-discharge water management. This framework presents a feasible roadmap for developing robust, field-ready hydrogel evaporators by integrating sustainable chemistry with performance-guided architecture.","PeriodicalId":427,"journal":{"name":"Separation and Purification Technology","volume":"23 1","pages":"137123"},"PeriodicalIF":8.6,"publicationDate":"2026-02-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146115976","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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 : 2026-02-02DOI: 10.1016/j.seppur.2026.137132
Kamatchi Rubini, Triveni Rajashekhar Mandlimath
This study mainly focuses on the development of magnetic vanadium oxide (IVO) reinforced by sodium alginate (Alg) to form hydrogel beads. The as-prepared hydrogel beads were characterized before and after the adsorption of tetracycline (TC) by several spectro-analytical techniques, including powder XRD, FE-SEM, TGA, and XPS. The maximum adsorption densities of 3.254 mmol/g on IVO@Alg hydrogel beads were calculated by a non-linear Langmuir adsorption isotherm. This value is one of the record-high adsorption densities among the materials reported in the literature. The chemical interaction between the adsorbent and adsorbate was confirmed by the kinetic models. The IVO@Alg hydrogel beads were independent of the pH conditions, and they could be used in the extensive pH range from 3 to 12 and were highly selective in the coexistence of binary organic solutions. After seven repeated cycle studies, the studied material showed excellent stability, confirmed by PXRD and FE-SEM analysis. The XPS analysis of TC adsorbed on IVO@Alg hydrogel beads revealed the presence of N-is the indication of successful adsorption of TC onto the IVO@Alg hydrogel beads. The material was also tested with the waters collected from the fields and found that the material is highly selective and suitable for practical applications. This adsorbent stands out as the optimal choice for eliminating TC with high stability from water, due to its remarkable adsorption capacity and simplicity of separation, attributed to its distinctive characteristics.
{"title":"Sodium alginate sustained magnetic vanadate hydr(oxide) hydrogel beads for robust, selective, and record-high uptake of tetracycline from waters","authors":"Kamatchi Rubini, Triveni Rajashekhar Mandlimath","doi":"10.1016/j.seppur.2026.137132","DOIUrl":"https://doi.org/10.1016/j.seppur.2026.137132","url":null,"abstract":"This study mainly focuses on the development of magnetic vanadium oxide (IVO) reinforced by sodium alginate (Alg) to form hydrogel beads. The as-prepared hydrogel beads were characterized before and after the adsorption of tetracycline (TC) by several spectro-analytical techniques, including powder XRD, FE-SEM, TGA, and XPS. The maximum adsorption densities of 3.254 mmol/g on IVO@Alg hydrogel beads were calculated by a non-linear Langmuir adsorption isotherm. This value is one of the record-high adsorption densities among the materials reported in the literature. The chemical interaction between the adsorbent and adsorbate was confirmed by the kinetic models. The IVO@Alg hydrogel beads were independent of the pH conditions, and they could be used in the extensive pH range from 3 to 12 and were highly selective in the coexistence of binary organic solutions. After seven repeated cycle studies, the studied material showed excellent stability, confirmed by PXRD and FE-SEM analysis. The XPS analysis of TC adsorbed on IVO@Alg hydrogel beads revealed the presence of N-is the indication of successful adsorption of TC onto the IVO@Alg hydrogel beads. The material was also tested with the waters collected from the fields and found that the material is highly selective and suitable for practical applications. This adsorbent stands out as the optimal choice for eliminating TC with high stability from water, due to its remarkable adsorption capacity and simplicity of separation, attributed to its distinctive characteristics.","PeriodicalId":427,"journal":{"name":"Separation and Purification Technology","volume":"44 1","pages":""},"PeriodicalIF":8.6,"publicationDate":"2026-02-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146101345","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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 : 2026-02-02DOI: 10.1016/j.seppur.2026.137042
Juqing Lou, Jinhao Zhu, Mengru Han, Dong Che, Qi Su, Zihang Zhu, Jingxuan chen
To address sludge retention time (SRT) conflicts in traditional nitrogen/phosphorus removal, and low C/N ratio in wastewater, an iron‑carbon micro-electrolysis (IC-ME) coupled oxygen-limited sequencing batch biofilm reactor (SBBR) was developed. Using the synergistic growth of immobilized biofilm and suspended sludge, dual-SRT microorganisms were enriched, forming a nitrifiers-denitrifiers‑phosphorus accumulating organisms (PAOs) synergistic metabolic system. Results showed that under low C/N (2.5:1), dissolved oxygen (DO) = 1.6 ± 0.3 mg/L, total nitrogen (TN) and total phosphorus (TP) removal efficiencies stably exceeded 94.5% and 89%, respectively. IC-ME enhanced phosphorus removal via precipitates. The anaerobic ammonium-oxidizing bacteria (AnAOB) were promoted while nitrite-oxidizing bacteria (NOB) were inhibited. A spatial zoning of “outer nitrification-inner denitrification/anammox” with significantly increased abundance of iron-metabolizing genus Spirochaeta and Ignavibacterium was built. DO gradient and iron‑carbon microenvironment synergy drove functional bacteria dynamics, forming an efficient network. The results provide an innovative chemical-biological solution for simultaneous nitrogen/phosphorus removal in low-C/N municipal wastewater.
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