Microplastics (MPs) are easily prone to adsorption reactions in an aquatic environment. Dyes in textile wastewater might be released and adsorbed by microplastics, causing ecological pollution. In this paper, polyamide microplastics (PA MPs) and reactive orange dye (KGN) were used as the main research objects, the adsorption capacity of different MPs, the adsorption mechanisms of KGN on PA MPs, and the effect of microplastic adsorption on the coagulation process were investigated. PA MPs had a maximum adsorption capacity of 0.866 mg/g. The kinetic results demonstrated that chemisorption, which can be broken down into three stages: membrane diffusion, intraparticle diffusion, and dynamic equilibrium, was primarily responsible for controlling the adsorption process. Adsorption took place on the surface of the monomolecular layer, according to the isotherm modeling, which indicated that the adsorption results were more consistent with the Langmuir isotherm. In addition, the effect of microplastic adsorption followed by coagulation experiments was investigated. When reactive orange is adsorbed by PA MPs, the maximum increase in coagulation removal efficiency is 4.7 %, it can also improve the growth ability of flocs, enhance the uniformity, and make their average particle size close to 63 μm. Finally, the possible mechanisms of adsorption and coagulation during the experiments are described, and an outlook for future work is given.
{"title":"Microplastics affect the removal of dye in textile wastewater: Adsorption capacity and its effect on coagulation behavior","authors":"Yingying Duan, Shu-Ying Sun, Jianhai Zhao, Hongying Yuan","doi":"10.1016/j.seppur.2024.130505","DOIUrl":"https://doi.org/10.1016/j.seppur.2024.130505","url":null,"abstract":"Microplastics (MPs) are easily prone to adsorption reactions in an aquatic environment. Dyes in textile wastewater might be released and adsorbed by microplastics, causing ecological pollution. In this paper, polyamide microplastics (PA MPs) and reactive orange dye (KGN) were used as the main research objects, the adsorption capacity of different MPs, the adsorption mechanisms of KGN on PA MPs, and the effect of microplastic adsorption on the coagulation process were investigated. PA MPs had a maximum adsorption capacity of 0.866 mg/g. The kinetic results demonstrated that chemisorption, which can be broken down into three stages: membrane diffusion, intraparticle diffusion, and dynamic equilibrium, was primarily responsible for controlling the adsorption process. Adsorption took place on the surface of the monomolecular layer, according to the isotherm modeling, which indicated that the adsorption results were more consistent with the Langmuir isotherm. In addition, the effect of microplastic adsorption followed by coagulation experiments was investigated. When reactive orange is adsorbed by PA MPs, the maximum increase in coagulation removal efficiency is 4.7 %, it can also improve the growth ability of flocs, enhance the uniformity, and make their average particle size close to 63 μm. Finally, the possible mechanisms of adsorption and coagulation during the experiments are described, and an outlook for future work is given.","PeriodicalId":427,"journal":{"name":"Separation and Purification Technology","volume":"19 1","pages":""},"PeriodicalIF":8.6,"publicationDate":"2024-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142678591","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 : 2024-11-21DOI: 10.1016/j.seppur.2024.130644
Yijiang Ge, Qinrui Sun, Hongtao Bai, Jingde Li, Xiaohang Du
Degradation of organic pollutants by in-situ electrochemically synthetic hydrogen peroxide (H2O2) in electro-Fenton (EF) system is important for the treatment of wastewater. In this work, a Fe, Mo co-doped N@TiO2 electrocatalyst was constructed for H2O2 generation and applied to the degradation of organic dyes. The FeMoN@TiO2 catalyst in 0.1 M KOH exhibits excellent 2e- Oxygen reduction reaction (ORR) activity and stability, with a yield of up to 1409 mmol gcat-1h−1 and Faraday efficiency (FE) of 83.4 % at −0.7 V (relative to SCE) for more than 10 h. The in situ generated H2O2 delivers benign organic dyes degradation ability with high methylene blue (MB) removal rate of 98.2 % after 2 h in 0.1 M KOH without adding Fe2+. After adding Fe2+, the EF process occurs to degrade dyes more efficiently, with Congo red and phenol removal rates of more than 99.0 % and Ciprofloxacin (CIP) removal rate of more than 96.0 % in 0.1 M Na2SO4 solution. It is found that Mo doping increases the active sites of the catalyst, while the dopant of Fe can enhance can improve the electron transfer rate between the catalyst and reactants. Additionally, the synergistic Fe and Mo modulate the electronic structure of Ti, increasing the concentrations of Ti3+ and chemiadsorbed O. This enhances the electronic conductivity and the reactivity of the catalyst, leading to improved ability for H2O2 generation and organic pollutants degradation. Radical quenching experiments show that the in-situ generated H2O2 reacts with added Fe2+ to produce a large amount of ·OH, which is the main active substance for organic pollutants degradation. This study provides new insights for non-precious metal oxides to replace precious metals towards in-situ production of H2O2 and degradation of pollutants.
在电-芬顿（EF）系统中通过原位电化学合成过氧化氢（H2O2）降解有机污染物对废水处理非常重要。本研究构建了一种铁、钼共掺杂的 N@TiO2 电催化剂，用于生成 H2O2 并将其应用于有机染料的降解。在 0.1 M KOH 中，FeMoN@TiO2 催化剂表现出优异的 2e 氧还原反应（ORR）活性和稳定性，在 -0.7 V（相对于 SCE）电压下超过 10 小时，产率高达 1409 mmol gcat-1h-1，法拉第效率（FE）为 83.4%。原位生成的 H2O2 具有良性有机染料降解能力，在不添加 Fe2+ 的情况下，在 0.1 M KOH 中 2 小时后，亚甲基蓝（MB）的去除率高达 98.2%。在 0.1 M Na2SO4 溶液中，加入 Fe2+ 后，EF 过程会更有效地降解染料，刚果红和苯酚的去除率超过 99.0%，环丙沙星（CIP）的去除率超过 96.0%。研究发现，钼的掺杂增加了催化剂的活性位点，而铁的掺杂则提高了催化剂与反应物之间的电子转移率。此外，Fe 和 Mo 的协同作用调节了 Ti 的电子结构，增加了 Ti3+ 和化学吸附 O 的浓度，从而增强了催化剂的电子传导性和反应活性，提高了生成 H2O2 和降解有机污染物的能力。自由基淬灭实验表明，原位生成的 H2O2 会与添加的 Fe2+ 发生反应，产生大量 -OH，而 -OH 正是降解有机污染物的主要活性物质。这项研究为非贵金属氧化物取代贵金属在原位产生 H2O2 和降解污染物方面提供了新的见解。
{"title":"In situ production of hydrogen peroxide from Fe, Mo co-doped N@TiO2 for organic pollutant degradation","authors":"Yijiang Ge, Qinrui Sun, Hongtao Bai, Jingde Li, Xiaohang Du","doi":"10.1016/j.seppur.2024.130644","DOIUrl":"https://doi.org/10.1016/j.seppur.2024.130644","url":null,"abstract":"Degradation of organic pollutants by in-situ electrochemically synthetic hydrogen peroxide (H<sub>2</sub>O<sub>2</sub>) in electro-Fenton (EF) system is important for the treatment of wastewater. In this work, a Fe, Mo co-doped N@TiO<sub>2</sub> electrocatalyst was constructed for H<sub>2</sub>O<sub>2</sub> generation and applied to the degradation of organic dyes. The FeMoN@TiO<sub>2</sub> catalyst in 0.1 M KOH exhibits excellent 2e<sup>-</sup> Oxygen reduction reaction (ORR) activity and stability, with a yield of up to 1409 mmol gcat<sup>-1</sup>h<sup>−1</sup> and Faraday efficiency (FE) of 83.4 % at −0.7 V (relative to SCE) for more than 10 h. The in situ generated H<sub>2</sub>O<sub>2</sub> delivers benign organic dyes degradation ability with high methylene blue (MB) removal rate of 98.2 % after 2 h in 0.1 M KOH without adding Fe<sup>2+</sup>. After adding Fe<sup>2+</sup>, the EF process occurs to degrade dyes more efficiently, with Congo red and phenol removal rates of more than 99.0 % and Ciprofloxacin (CIP) removal rate of more than 96.0 % in 0.1 M Na<sub>2</sub>SO<sub>4</sub> solution. It is found that Mo doping increases the active sites of the catalyst, while the dopant of Fe can enhance can improve the electron transfer rate between the catalyst and reactants. Additionally, the synergistic Fe and Mo modulate the electronic structure of Ti, increasing the concentrations of Ti<sup>3+</sup> and chemiadsorbed O. This enhances the electronic conductivity and the reactivity of the catalyst, leading to improved ability for H<sub>2</sub>O<sub>2</sub> generation and organic pollutants degradation. Radical quenching experiments show that the in-situ generated H<sub>2</sub>O<sub>2</sub> reacts with added Fe<sup>2+</sup> to produce a large amount of ·OH, which is the main active substance for organic pollutants degradation. This study provides new insights for non-precious metal oxides to replace precious metals towards in-situ production of H<sub>2</sub>O<sub>2</sub> and degradation of pollutants.","PeriodicalId":427,"journal":{"name":"Separation and Purification Technology","volume":"108 1","pages":""},"PeriodicalIF":8.6,"publicationDate":"2024-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142678593","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 : 2024-11-21DOI: 10.1016/j.seppur.2024.130601
Chen-Cheng Mo, Fu-Xiang Tian, Xing-Yan Mu, Dong-Sheng Zhao, Bin Xu, Jing Ye, Zi-Jian Yao, Dong-Su Bi, Xiao-Jun Hu
The efficient removal of hydroxychloroquine (HCQ) by UV/ peroxymonosulfate (UV/PMS) and UV/peroxydisulfate (UV/PDS) treatments triggered by reactive oxygen species (ROS) was comprehensively compared in terms of process behaviors and the functional relevance of singlet oxygen (1O2). Both UV/PMS and UV/PDS can remove HCQ quickly and the elimination rate followed the trend as UV/PMS > UV/PDS > UV/H2O2. The individual contribution of ROS was determined and the reaction rates of ROS with HCQ were ranked as SO4•− (1.44 × 1010 M−1·s−1) > HO• (4.03 × 109 M−1·s−1) >1O2 (1.85 × 108 M−1·s−1). The main operation factors influencing the HCQ degradation including UV intensity, PMS/PDS dosages, pH and water substrates were explored comparatively. UV/PMS showed strong resilience against interferences from natural organics and coexistent ions due to the action of 1O2. The radical and non-radical oxidation pathways of HCQ by ROS attack were postulated. The effects of pretreatments on disinfection by-products (DBPs) production obeyed the tendency as PMS/Cl2 UV/PDS > UV/PMS. Although PMS/Cl2 (for 1O2 scenario) induced massive DBPs over UV/PMS and UV/PDS, UV/PMS effectively regulated DBPs risk by cooperation of radical and non-radical routes. Comprehensive investigations concentrating on the functional relevance of 1O2 regarding selective oxidability, resistance to water substrates and especially DBPs enhancement were conducted for the first time. The findings can also provide valuable inspirations for the UV/PMS application as a promising 1O2-related technology for the HCQ elimination, taking into accounts of trade-offs among high efficiency, acceptable cost, insensitivity to environmental disturbance and reduced toxicity associated with DBPs.
{"title":"A comparative study on the efficient removal of hydroxychloroquine via UV/peroxymonosulfate and UV/peroxydisulfate systems triggered by reactive oxygen species: Process behaviors and the functional relevance of singlet oxygen","authors":"Chen-Cheng Mo, Fu-Xiang Tian, Xing-Yan Mu, Dong-Sheng Zhao, Bin Xu, Jing Ye, Zi-Jian Yao, Dong-Su Bi, Xiao-Jun Hu","doi":"10.1016/j.seppur.2024.130601","DOIUrl":"https://doi.org/10.1016/j.seppur.2024.130601","url":null,"abstract":"The efficient removal of hydroxychloroquine (HCQ) by UV/ peroxymonosulfate (UV/PMS) and UV/peroxydisulfate (UV/PDS) treatments triggered by reactive oxygen species (ROS) was comprehensively compared in terms of process behaviors and the functional relevance of singlet oxygen (<sup>1</sup>O<sub>2</sub>). Both UV/PMS and UV/PDS can remove HCQ quickly and the elimination rate followed the trend as UV/PMS > UV/PDS > UV/H<sub>2</sub>O<sub>2</sub>. The individual contribution of ROS was determined and the reaction rates of ROS with HCQ were ranked as SO<sub>4</sub>•<sup>−</sup> (1.44 × 10<sup>10</sup> M<sup>−1</sup>·s<sup>−1</sup>) > HO• (4.03 × 10<sup>9</sup> M<sup>−1</sup>·s<sup>−1</sup>) ><sup>1</sup>O<sub>2</sub> (1.85 × 10<sup>8</sup> M<sup>−1</sup>·s<sup>−1</sup>). The main operation factors influencing the HCQ degradation including UV intensity, PMS/PDS dosages, pH and water substrates were explored comparatively. UV/PMS showed strong resilience against interferences from natural organics and coexistent ions due to the action of <sup>1</sup>O<sub>2</sub>. The radical and non-radical oxidation pathways of HCQ by ROS attack were postulated. The effects of pretreatments on disinfection by-products (DBPs) production obeyed the tendency as PMS/Cl<sub>2</sub> <span><math><mo is=\"true\">≫</mo></math></span> UV/PDS > UV/PMS. Although PMS/Cl<sub>2</sub> (for <sup>1</sup>O<sub>2</sub> scenario) induced massive DBPs over UV/PMS and UV/PDS, UV/PMS effectively regulated DBPs risk by cooperation of radical and non-radical routes. Comprehensive investigations concentrating on the functional relevance of <sup>1</sup>O<sub>2</sub> regarding selective oxidability, resistance to water substrates and especially DBPs enhancement were conducted for the first time. The findings can also provide valuable inspirations for the UV/PMS application as a promising <sup>1</sup>O<sub>2</sub>-related technology for the HCQ elimination, taking into accounts of trade-offs among high efficiency, acceptable cost, insensitivity to environmental disturbance and reduced toxicity associated with DBPs.","PeriodicalId":427,"journal":{"name":"Separation and Purification Technology","volume":"73 1","pages":""},"PeriodicalIF":8.6,"publicationDate":"2024-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142678592","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 : 2024-11-21DOI: 10.1016/j.seppur.2024.130637
Yilong Luo, Hong Xiao, Zuoding Ning, Wenhan Wang, Qing Wang, Bin Wang, Rongfei Zhou, Weihong Xing
Efficient CO2 capture from flue gas and natural gas is highly desirable to reduce greenhouse gas emissions. Discrete SSZ-39 zeolite nanosheets are prepared by the solvent-free seed-assisted route for the first time to capture CO2. Synthesis parameters such as H2O/SiO2 ratio and synthesis time are optimized and the formation mechanism of the SSZ-39 zeolite nanosheets is studied. The nanosheets have a thickness of 30 nm and an aspect ratio of 10. The HR-TEM characterization shows that the base face of the nanosheet corresponds to its (001) plane with a pore size of 3.8 Å × 3.8 Å. The CO2/N2 and CO2/CH4 selectivities of SSZ-39 zeolite nanosheets are as high as 1092 and 136 by Ideal Adsorption Solution Theory (IAST), respectively. Furthermore, breakthrough results indicate that SSZ-39 zeolite nanosheets have great application potential for separating CO2 from flue gas and natural gas.
{"title":"Synthesis of discrete SSZ-39 zeolite nanosheets by solvent-free seed-assisted route for efficient CO2 capture","authors":"Yilong Luo, Hong Xiao, Zuoding Ning, Wenhan Wang, Qing Wang, Bin Wang, Rongfei Zhou, Weihong Xing","doi":"10.1016/j.seppur.2024.130637","DOIUrl":"https://doi.org/10.1016/j.seppur.2024.130637","url":null,"abstract":"Efficient CO<sub>2</sub> capture from flue gas and natural gas is highly desirable to reduce greenhouse gas emissions. Discrete SSZ-39 zeolite nanosheets are prepared by the solvent-free seed-assisted route for the first time to capture CO<sub>2</sub>. Synthesis parameters such as H<sub>2</sub>O/SiO<sub>2</sub> ratio and synthesis time are optimized and the formation mechanism of the SSZ-39 zeolite nanosheets is studied. The nanosheets have a thickness of 30 nm and an aspect ratio of 10. The HR-TEM characterization shows that the base face of the nanosheet corresponds to its <em>(001)</em> plane with a pore size of 3.8 Å × 3.8 Å. The CO<sub>2</sub>/N<sub>2</sub> and CO<sub>2</sub>/CH<sub>4</sub> selectivities of SSZ-39 zeolite nanosheets are as high as 1092 and 136 by Ideal Adsorption Solution Theory (IAST), respectively. Furthermore, breakthrough results indicate that SSZ-39 zeolite nanosheets have great application potential for separating CO<sub>2</sub> from flue gas and natural gas.","PeriodicalId":427,"journal":{"name":"Separation and Purification Technology","volume":"14 1","pages":""},"PeriodicalIF":8.6,"publicationDate":"2024-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142678588","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}
Hexagonal boron nitride (h-BN) has widespread application in the field of adsorption desulfurization due to their excellent performance. However, the selective adsorption of h-BN is still a challenge. Here, to further enhance the adsorption capacity and selectivity of BN-based adsorbents, the stability of Fe single-atom adsorbents (SAAs, Fe-BN), and their adsorption performance and mechanism towards the representative sulfide, dibenzothiophene (DBT) were investigated by density functional theory calculations. Specifically, four Fe doping types are considered: Fe_cen_B and Fe_edg_B (both at B sites), Fe_cen_N (at the N site), and Fe_four_cen (at the B − N site). All types of Fe-BN SAAs exhibit outstanding adsorption capacity for thiophenic sulfides. Especially for Fe_edg_B1, which shows 62.6 % improvement in adsorption performance compared to h-BN for DBT. Quantum chemical analysis reveals that S-Fe coordination bonds formed between S atom in DBT and Fe atoms via coordination interaction, significantly improving the adsorption selectivity and capacity. This study may provide a useful reference for designing the highly selective SAAs.
六方氮化硼（h-BN）因其优异的性能在吸附脱硫领域得到了广泛应用。然而，h-BN 的选择性吸附仍然是一个难题。为了进一步提高 BN 基吸附剂的吸附能力和选择性，本文通过密度泛函理论计算研究了铁单原子吸附剂（SAAs，Fe-BN）的稳定性及其对代表性硫化物二苯并噻吩（DBT）的吸附性能和机理。具体来说，我们考虑了四种铁掺杂类型：Fe_cen_B和Fe_edg_B（均位于B位）、Fe_cen_N（位于N位）和Fe_four_cen（位于B - N位）。所有类型的 Fe-BN SAA 对噻吩硫化物都有出色的吸附能力。特别是 Fe_edg_B1，与 h-BN 相比，它对 DBT 的吸附性能提高了 62.6%。量子化学分析表明，DBT 中的 S 原子与 Fe 原子通过配位相互作用形成了 S-Fe 配位键，从而显著提高了吸附选择性和吸附容量。这项研究可为设计高选择性的 SAAs 提供有益的参考。
{"title":"The origin of selective adsorption desulfurization by Fe single atom adsorbents on hexagonal boron nitride surface","authors":"Naixia Lv, Tianxiao Zhu, Dongmei Luo, Wei Yi, Chunyan Dai, Hongping Li, Wenshuai Zhu, Huaming Li","doi":"10.1016/j.seppur.2024.130641","DOIUrl":"https://doi.org/10.1016/j.seppur.2024.130641","url":null,"abstract":"Hexagonal boron nitride (h-BN) has widespread application in the field of adsorption desulfurization due to their excellent performance. However, the selective adsorption of h-BN is still a challenge. Here, to further enhance the adsorption capacity and selectivity of BN-based adsorbents, the stability of Fe single-atom adsorbents (SAAs, Fe-BN), and their adsorption performance and mechanism towards the representative sulfide, dibenzothiophene (DBT) were investigated by density functional theory calculations. Specifically, four Fe doping types are considered: Fe_cen_B and Fe_edg_B (both at B sites), Fe_cen_N (at the N site), and Fe_four_cen (at the B − N site). All types of Fe-BN SAAs exhibit outstanding adsorption capacity for thiophenic sulfides. Especially for Fe_edg_B1, which shows 62.6 % improvement in adsorption performance compared to h-BN for DBT. Quantum chemical analysis reveals that S-Fe coordination bonds formed between S atom in DBT and Fe atoms via coordination interaction, significantly improving the adsorption selectivity and capacity. This study may provide a useful reference for designing the highly selective SAAs.","PeriodicalId":427,"journal":{"name":"Separation and Purification Technology","volume":"19 1","pages":""},"PeriodicalIF":8.6,"publicationDate":"2024-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142678589","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}
The authors regret The image in Fig. 1b of this article showing the XRD pattern of RP was inadvertently misused by the RP-AP-0.1. The correct version of the Fig. 1 appears below.
{"title":"Corrigendum to “Aminated metal-free red phosphorus nanosheets for adsorption and photocatalytic reduction of Cr(VI) from water” [Sep. Purif. Technol. 274 (2021) 118968]","authors":"Yingjun Wang, Yequn Liu, Shuangyou Bao, Yongsheng Yu, Jiaming Li, Weiwei Yang, Shichong Xu, Haibo Li","doi":"10.1016/j.seppur.2024.130581","DOIUrl":"https://doi.org/10.1016/j.seppur.2024.130581","url":null,"abstract":"The authors regret The image in Fig. 1b of this article showing the XRD pattern of RP was inadvertently misused by the RP-AP-0.1. The correct version of the Fig. 1 appears below.<span><figure><span><img alt=\"\" height=\"557\" src=\"https://ars.els-cdn.com/content/image/1-s2.0-S138358662404320X-fx1.jpg\"/><ol><li><span><span>Download: <span>Download high-res image (578KB)</span></span></span></li><li><span><span>Download: <span>Download full-size image</span></span></span></li></ol></span></figure></span>","PeriodicalId":427,"journal":{"name":"Separation and Purification Technology","volume":"41 1","pages":""},"PeriodicalIF":8.6,"publicationDate":"2024-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142678594","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 : 2024-11-21DOI: 10.1016/j.seppur.2024.130640
Minjun Zhang, Yifan Wang, Wan Zhou, Xiaolong Zheng, Xinjie Liu, Baoan Zhu, Shenqi Wang, Lei Zhou
Excessive bilirubin poses a significant risk factor in the progression of chronic liver disease. However, due to its nature as an albumin-bound toxin, bilirubin cannot be efficiently eliminated through conventional hemodialysis therapy or existing hemoperfusion adsorbents, presenting a challenge in selective removal. It is widely acknowledged that adjusting the pore properties of adsorbents can impact the adsorption efficiency of a hemoperfusion adsorbent. However, few studies have been working on improving the selectivity of bilirubin removal through precise regulation of pore size. In this paper, we aim to demonstrate that the selectivity of bilirubin removal can be achieved and enhanced by fine-tuning the pore size of ordered mesoporous materials. Ordered mesoporous SiO2 (OMS) is selected as the research object due to its highly organized and uniform porous structure, as well as its excellent biocompatibility. The results indicate that OMS nanoparticles with a pore diameter of 2.5 nm (OMS-2.5 nm) exhibit superior adsorption capacity for bilirubin in both pure and albumin-rich solutions, suggesting the potential for achieving efficient and selective bilirubin removal through pore size optimization. Furthermore, to demonstrate the feasibility of OMS nanoparticles in practical applications (i.e. their inheritability of selectivity), we engineered OMS nanoparticles into polyvinyl alcohol (PVA) microspheres, forming OMS/PVA composite microspheres. The incorporation of OMS nanoparticles significantly enhances the bilirubin adsorption capacity of PVA microspheres while simultaneously reducing their albumin adsorption. The excellent selective adsorption efficacy of OMS-2.5 nm is preserved in the composite microspheres, underscoring its potential therapeutic benefits for treating diseases with excessive bilirubin levels.
{"title":"Ordered mesoporous SiO2 as hemoperfusion adsorbents for enhanced selectivity of bilirubin removal from blood","authors":"Minjun Zhang, Yifan Wang, Wan Zhou, Xiaolong Zheng, Xinjie Liu, Baoan Zhu, Shenqi Wang, Lei Zhou","doi":"10.1016/j.seppur.2024.130640","DOIUrl":"https://doi.org/10.1016/j.seppur.2024.130640","url":null,"abstract":"Excessive bilirubin poses a significant risk factor in the progression of chronic liver disease. However, due to its nature as an albumin-bound toxin, bilirubin cannot be efficiently eliminated through conventional hemodialysis therapy or existing hemoperfusion adsorbents, presenting a challenge in selective removal. It is widely acknowledged that adjusting the pore properties of adsorbents can impact the adsorption efficiency of a hemoperfusion adsorbent. However, few studies have been working on improving the selectivity of bilirubin removal through precise regulation of pore size. In this paper, we aim to demonstrate that the selectivity of bilirubin removal can be achieved and enhanced by fine-tuning the pore size of ordered mesoporous materials. Ordered mesoporous SiO<sub>2</sub> (OMS) is selected as the research object due to its highly organized and uniform porous structure, as well as its excellent biocompatibility. The results indicate that OMS nanoparticles with a pore diameter of 2.5 nm (OMS-2.5 nm) exhibit superior adsorption capacity for bilirubin in both pure and albumin-rich solutions, suggesting the potential for achieving efficient and selective bilirubin removal through pore size optimization. Furthermore, to demonstrate the feasibility of OMS nanoparticles in practical applications (<em>i.e.</em> their inheritability of selectivity), we engineered OMS nanoparticles into polyvinyl alcohol (PVA) microspheres, forming OMS/PVA composite microspheres. The incorporation of OMS nanoparticles significantly enhances the bilirubin adsorption capacity of PVA microspheres while simultaneously reducing their albumin adsorption. The excellent selective adsorption efficacy of OMS-2.5 nm is preserved in the composite microspheres, underscoring its potential therapeutic benefits for treating diseases with excessive bilirubin levels.","PeriodicalId":427,"journal":{"name":"Separation and Purification Technology","volume":"1 1","pages":""},"PeriodicalIF":8.6,"publicationDate":"2024-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142678597","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 : 2024-11-21DOI: 10.1016/j.seppur.2024.130634
Wanyan Li, Mei-Fu Zhou, Ning Wang, Hannian Gu
Scandium (Sc) is the most commercially valuable rare earth element due to its unique superior properties and extensive application. Bauxite residue (red mud) is regarded as one of the industrial wastes but has the potential to recover Sc. In this study, a two-step process via sulfation roasting with iron sulfate and water leaching was developed to selectively recover Sc from red mud. The results showed that the leaching efficiency of Sc depended on various factors including roasting temperature, the dosage of iron sulfate, and roasting atmosphere. The leaching efficiency of Sc reached 78.8 % with 5.1 % of Fe and 13.0 % of Al dissolved in the Sc-rich solution at the optimum conditions of the SO3-controlled roasting at 700 °C for 15 min with red mud and iron sulfate mass ratio of 1:1, followed by water leaching at room temperature for 180 min. It is demonstrated that the Sc-rich solution could be recycled for leaching clinkers to accumulate Sc concentrations to meet the requirements of solvent extraction. This study also provides new insights about the reaction mechanisms and phase transformations of the roasting and water leaching process. The findings provided a valorization route of red mud by recovery of Sc resource due to the relatively simple process, high selectivity, and low-cost reagents.
{"title":"Selective extraction of scandium from bauxite residue (red mud) utilizing iron sulfate roasting followed by water leaching","authors":"Wanyan Li, Mei-Fu Zhou, Ning Wang, Hannian Gu","doi":"10.1016/j.seppur.2024.130634","DOIUrl":"https://doi.org/10.1016/j.seppur.2024.130634","url":null,"abstract":"Scandium (Sc) is the most commercially valuable rare earth element due to its unique superior properties and extensive application. Bauxite residue (red mud) is regarded as one of the industrial wastes but has the potential to recover Sc. In this study, a two-step process via sulfation roasting with iron sulfate and water leaching was developed to selectively recover Sc from red mud. The results showed that the leaching efficiency of Sc depended on various factors including roasting temperature, the dosage of iron sulfate, and roasting atmosphere. The leaching efficiency of Sc reached 78.8 % with 5.1 % of Fe and 13.0 % of Al dissolved in the Sc-rich solution at the optimum conditions of the SO<sub>3</sub>-controlled roasting at 700 °C for 15 min with red mud and iron sulfate mass ratio of 1:1, followed by water leaching at room temperature for 180 min. It is demonstrated that the Sc-rich solution could be recycled for leaching clinkers to accumulate Sc concentrations to meet the requirements of solvent extraction. This study also provides new insights about the reaction mechanisms and phase transformations of the roasting and water leaching process. The findings provided a valorization route of red mud by recovery of Sc resource due to the relatively simple process, high selectivity, and low-cost reagents.","PeriodicalId":427,"journal":{"name":"Separation and Purification Technology","volume":"8 1","pages":""},"PeriodicalIF":8.6,"publicationDate":"2024-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142678590","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 : 2024-11-21DOI: 10.1016/j.seppur.2024.130643
Lin Hu, Jingcheng Wu, Xian-Yong Wei, Changlin Yu, Lei Li, Lingling Li
Exploring the value-added utilization of lignin showed the great significant to realize the efficient conversion of lignocellulosic biomass, which had good environmental, economic, and social benefits. However, the catalytic hydrogenolysis of lignin faced the great problems, including harsh reaction conditions and low product yield. In this research, the FeOx modified Ru/mordenite (M) was synthesized by deposition–precipitation method and strengthened the effective lignin conversion process. Ru2.5%Fe2.5%/M showed the high catalytic hydrogenolysis activity of β-O-4 and α-O-4 bond under the condition of 260 °C, 1 MPa H2, and 3 h in the methanol. Though the research about reaction of model compounds and several characterizations, synergistic action of highly dispersion RuFe nanoparticles and acidic sites significantly promoted the breakage of C-O bond. The introduction of Fe species can reduced the size of metal nanoparticles. The lignin oil reached the high value of 47.8 wt%, and contained the low RC value of phenolic compounds. Finally, the reaction mechanism of lignin catalytic hydrogenolysis was discussed, and it found that the highly dispersed RuFe nanoparticles enhanced the synergistic transfer ability of H2 and methanol to release H•. This research would give some useful understandings for the efficient thermochemical conversion of lignin.
{"title":"Reaction synergy of RuFe bimetallic catalysts on mordenite in lignin hydrogenolysis for aromatic compounds production","authors":"Lin Hu, Jingcheng Wu, Xian-Yong Wei, Changlin Yu, Lei Li, Lingling Li","doi":"10.1016/j.seppur.2024.130643","DOIUrl":"https://doi.org/10.1016/j.seppur.2024.130643","url":null,"abstract":"Exploring the value-added utilization of lignin showed the great significant to realize the efficient conversion of lignocellulosic biomass, which had good environmental, economic, and social benefits. However, the catalytic hydrogenolysis of lignin faced the great problems, including harsh reaction conditions and low product yield. In this research, the FeOx modified Ru/mordenite (M) was synthesized by deposition–precipitation method and strengthened the effective lignin conversion process. Ru<sub>2.5%</sub>Fe<sub>2.5%</sub>/M showed the high catalytic hydrogenolysis activity of β-O-4 and α-O-4 bond under the condition of 260 °C, 1 MPa H<sub>2</sub>, and 3 h in the methanol. Though the research about reaction of model compounds and several characterizations, synergistic action of highly dispersion RuFe nanoparticles and acidic sites significantly promoted the breakage of C-O bond. The introduction of Fe species can reduced the size of metal nanoparticles. The lignin oil reached the high value of 47.8 wt%, and contained the low RC value of phenolic compounds. Finally, the reaction mechanism of lignin catalytic hydrogenolysis was discussed, and it found that the highly dispersed RuFe nanoparticles enhanced the synergistic transfer ability of H<sub>2</sub> and methanol to release H•. This research would give some useful understandings for the efficient thermochemical conversion of lignin.","PeriodicalId":427,"journal":{"name":"Separation and Purification Technology","volume":"192 1","pages":""},"PeriodicalIF":8.6,"publicationDate":"2024-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142678587","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}
{"title":"Corrigendum to “Utilization of recycled materials for low-cost MXene synthesis and fabrication of graphite/MXene composite for enhanced water desalination performance” [Sep. Purif. Technol. 354(Part 4) 2025 129055]","authors":"M.A. Zaed, R. Saidur, A.K. Pandey, Mohammed Kadhom, K.H. Tan, Jayesh Cherusseri, N. Abdullah","doi":"10.1016/j.seppur.2024.130156","DOIUrl":"https://doi.org/10.1016/j.seppur.2024.130156","url":null,"abstract":"The authors regret that <strong>Fig. 4(c)</strong> should be replaced by the following figure.<span><figure><span><img alt=\"\" height=\"399\" src=\"https://ars.els-cdn.com/content/image/1-s2.0-S1383586624038954-fx1.jpg\"/><ol><li><span><span>Download: <span>Download high-res image (322KB)</span></span></span></li><li><span><span>Download: <span>Download full-size image</span></span></span></li></ol></span></figure></span>","PeriodicalId":427,"journal":{"name":"Separation and Purification Technology","volume":"1 1","pages":""},"PeriodicalIF":8.6,"publicationDate":"2024-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142678599","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}
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