The long-term accumulation of manganese sulfate residues can lead to the release of soluble manganese ions, thereby contaminating the surrounding environment. Although numerous methods exist to address the issue of soluble manganese ions, current harmless treatment approaches fail to consider the subsequent utilization of manganese slag. This study aims to control the magnetic properties of processed residues by adjusting the addition of barium hydroxide and the reaction duration. Our results reveal that the harmless treatment of manganese sulfate slag is achievable with various amounts of barium hydroxide, and the magnetic properties of the reconstructed slag increase with the increased barium hydroxide dosage. Magnetic separation is employed to separate the magnetic components from the reconstructed slag, and the distribution state of these magnetic substance is modulated by altering the particle size and reagent addition. Under optimal conditions, this study finds that the grade of iron was 24.17 %, the grade of manganese was 8.08 %, and the recovery could reach 79 % for iron and 70 % for manganese. Finally, the fining slag obtained by magnetic separation was utilized as an additive in the preparation of ferrites, reducing the minimum reflection loss of the ferrites to −16.18 dB, signifying up to 90 % electromagnetic wave attenuation. These findings indicate that the fining slags holds great potential as a dopant for ferrites, offering a viable pathway for the resourceful and environmentally friendly treatment of manganese sulfate residues.
{"title":"Efficient green separation of Fe-Mn magnetics in manganese sulfate residue via Mn morphology control","authors":"Wentao Li, Qian Zhang, Zuohua Liu, Changyuan Tao, Guocan Zheng, Nanxiong Chen, Dong Wang, Hufei Chen","doi":"10.1016/j.seppur.2024.130542","DOIUrl":"https://doi.org/10.1016/j.seppur.2024.130542","url":null,"abstract":"The long-term accumulation of manganese sulfate residues can lead to the release of soluble manganese ions, thereby contaminating the surrounding environment. Although numerous methods exist to address the issue of soluble manganese ions, current harmless treatment approaches fail to consider the subsequent utilization of manganese slag. This study aims to control the magnetic properties of processed residues by adjusting the addition of barium hydroxide and the reaction duration. Our results reveal that the harmless treatment of manganese sulfate slag is achievable with various amounts of barium hydroxide, and the magnetic properties of the reconstructed slag increase with the increased barium hydroxide dosage. Magnetic separation is employed to separate the magnetic components from the reconstructed slag, and the distribution state of these magnetic substance is modulated by altering the particle size and reagent addition. Under optimal conditions, this study finds that the grade of iron was 24.17 %, the grade of manganese was 8.08 %, and the recovery could reach 79 % for iron and 70 % for manganese. Finally, the fining slag obtained by magnetic separation was utilized as an additive in the preparation of ferrites, reducing the minimum reflection loss of the ferrites to −16.18 dB, signifying up to 90 % electromagnetic wave attenuation. These findings indicate that the fining slags holds great potential as a dopant for ferrites, offering a viable pathway for the resourceful and environmentally friendly treatment of manganese sulfate residues.","PeriodicalId":427,"journal":{"name":"Separation and Purification Technology","volume":"60 1","pages":""},"PeriodicalIF":8.6,"publicationDate":"2024-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142610319","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}
This research describes the application of a double molecular stacking model, based on statistical physics theory, to analyze and explain the adsorption mechanism of triclosan on different high-silica zeolites. Modelling results indicated that molecules of this pollutant were adsorbed via different configurations on surfaces of tested zeolites where non-parallel, parallel, and mixed orientations occurred depending on tested systems. The adsorption capacities to remove triclosan from water using high-silica zeolites depended on their composition and textural parameters where the best zeolite showed a high surface area. Calculated adsorption energies ranged from 15 to 26 kJ/mol for all tested systems. This modelling approach indicated that triclosan separation mechanism was controlled by physical interactions where hydrogen bonding and van der Waals forces played a relevant role to remove this pollutant. A thermodynamic analysis of these adsorption systems was also performed. These theoretical results contribute to characterize the adsorption properties and mechanism of high-silica zeolites to remove toxic organic compounds from water
{"title":"Triclosan removal using high-silica zeolites: A novel insight via statistical physics modelling","authors":"Mohamed Bouzidi, Lotfi Sellaoui, Fatma Dhaouadi, Fathi Alimi, Norah Alwadai, Taoufik Saidani, Adrián Bonilla-Petriciolet","doi":"10.1016/j.seppur.2024.130547","DOIUrl":"https://doi.org/10.1016/j.seppur.2024.130547","url":null,"abstract":"This research describes the application of a double molecular stacking model, based on statistical physics theory, to analyze and explain the adsorption mechanism of triclosan on different high-silica zeolites. Modelling results indicated that molecules of this pollutant were adsorbed via different configurations on surfaces of tested zeolites where non-parallel, parallel, and mixed orientations occurred depending on tested systems. The adsorption capacities to remove triclosan from water using high-silica zeolites depended on their composition and textural parameters where the best zeolite showed a high surface area. Calculated adsorption energies ranged from 15 to 26 kJ/mol for all tested systems. This modelling approach indicated that triclosan separation mechanism was controlled by physical interactions where hydrogen bonding and van der Waals forces played a relevant role to remove this pollutant. A thermodynamic analysis of these adsorption systems was also performed. These theoretical results contribute to characterize the adsorption properties and mechanism of high-silica zeolites to remove toxic organic compounds from water","PeriodicalId":427,"journal":{"name":"Separation and Purification Technology","volume":"162 1","pages":""},"PeriodicalIF":8.6,"publicationDate":"2024-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142637523","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 : 2024-11-14DOI: 10.1016/j.seppur.2024.130534
Zheng Wang, Yong Fan, Yimin Zhang, Hong Liu, Peng Liu, Qian Wan
In the context of the accelerated development of all-vanadium liquid flow batteries and vanadium-based alloys, there is a growing requirement for high-purity V2O5. In this study, vanadium shale leachate was used as raw material and V2O5 products with purity >99.9 % were prepared greenly and efficiently through vanadium precipitation by melamine adsorption, and the adsorption conditions and mechanisms were investigated. XPS, FTIR, DFT, and MD results show that the –NH2 and N atoms on the melamine bind to VO2+ through coordination, resulting in high adsorption performance. The Langmuir isothermal adsorption model predicted the maximum adsorption capacity of melamine for vanadium to be 892.86 mg/g. Furthermore, the adsorption thermodynamics indicated that the adsorption reaction was heat-absorbing and spontaneous. The pseudo-second-order kinetic model provided a superior description of the adsorption kinetic data at 363 K, and the adsorption process was found to be mainly controlled by the chemical reaction control kinetic model. The reaction conditions were optimized by response surface methodology, and under the optimized conditions, the vanadium precipitation rate was >99 %, the purity of the prepared V2O5 was >99.9 %, and the vanadium precipitation process did not produce ammonia–nitrogen wastewater. The method provides an efficient, economical, and environmentally friendly way for the preparation of high-purity V2O5.
{"title":"Innovated application of melamine for high-purity V2O5 preparation","authors":"Zheng Wang, Yong Fan, Yimin Zhang, Hong Liu, Peng Liu, Qian Wan","doi":"10.1016/j.seppur.2024.130534","DOIUrl":"https://doi.org/10.1016/j.seppur.2024.130534","url":null,"abstract":"In the context of the accelerated development of all-vanadium liquid flow batteries and vanadium-based alloys, there is a growing requirement for high-purity V<sub>2</sub>O<sub>5</sub>. In this study, vanadium shale leachate was used as raw material and V<sub>2</sub>O<sub>5</sub> products with purity >99.9 % were prepared greenly and efficiently through vanadium precipitation by melamine adsorption, and the adsorption conditions and mechanisms were investigated. XPS, FTIR, DFT, and MD results show that the –NH<sub>2</sub> and N atoms on the melamine bind to VO<sub>2</sub><sup>+</sup> through coordination, resulting in high adsorption performance. The Langmuir isothermal adsorption model predicted the maximum adsorption capacity of melamine for vanadium to be 892.86 mg/g. Furthermore, the adsorption thermodynamics indicated that the adsorption reaction was heat-absorbing and spontaneous. The pseudo-second-order kinetic model provided a superior description of the adsorption kinetic data at 363 K, and the adsorption process was found to be mainly controlled by the chemical reaction control kinetic model. The reaction conditions were optimized by response surface methodology, and under the optimized conditions, the vanadium precipitation rate was >99 %, the purity of the prepared V<sub>2</sub>O<sub>5</sub> was >99.9 %, and the vanadium precipitation process did not produce ammonia–nitrogen wastewater. The method provides an efficient, economical, and environmentally friendly way for the preparation of high-purity V<sub>2</sub>O<sub>5</sub>.","PeriodicalId":427,"journal":{"name":"Separation and Purification Technology","volume":"11 1","pages":""},"PeriodicalIF":8.6,"publicationDate":"2024-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142609778","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 : 2024-11-14DOI: 10.1016/j.seppur.2024.130477
YeonJi Choi, Kyung Min Choi, Kyungtae Park
The development of the space industry, increasing semiconductor production, and growing demand for medical xenon has significantly boosted the xenon market. However, the commercial production of cryogenic distillation is an energy intensive process and results in economic and environmental issues. In this study, experimental adsorbent data collection and a vacuum pressure swing adsorption (VPSA) simulation are presented for recovering and purifying xenon from semiconductor waste gas containing 0.1 mol% Xe and 99.9 mol% N2. FMOFCu was used for xenon adsorption, and the adsorption data were collected through isotherm and breakthrough experiments using Xe and N2. Further, the VPSA process was designed and parametric studies were conducted using gPROMS simulations based on experimental data. Consequently, 99.9 % of the xenon product was produced through a two-stage VPSA process, and an economic and environmental evaluation of the produced xenon was conducted. The minimum selling price of the produced xenon ranged from 554.42 to 1482.08 $/kgXe, which was more than 1000 $/kgXe lower than the current wholesale price of xenon. The electricity consumption of the proposed VPSA process was 40.99 kWh, and the calculated global warming potential was 28.92 kg CO2 eq for 1 kg of Xe produced. Therefore, the proposed VPSA process was economical and environmentally sustainable
{"title":"Four-bed vacuum pressure swing adsorption for xenon recycling from semiconductor waste gas","authors":"YeonJi Choi, Kyung Min Choi, Kyungtae Park","doi":"10.1016/j.seppur.2024.130477","DOIUrl":"https://doi.org/10.1016/j.seppur.2024.130477","url":null,"abstract":"The development of the space industry, increasing semiconductor production, and growing demand for medical xenon has significantly boosted the xenon market. However, the commercial production of cryogenic distillation is an energy intensive process and results in economic and environmental issues. In this study, experimental adsorbent data collection and a vacuum pressure swing adsorption (VPSA) simulation are presented for recovering and purifying xenon from semiconductor waste gas containing 0.1 mol% Xe and 99.9 mol% N<sub>2</sub>. FMOFCu was used for xenon adsorption, and the adsorption data were collected through isotherm and breakthrough experiments using Xe and N<sub>2</sub>. Further, the VPSA process was designed and parametric studies were conducted using gPROMS simulations based on experimental data. Consequently, 99.9 % of the xenon product was produced through a two-stage VPSA process, and an economic and environmental evaluation of the produced xenon was conducted. The minimum selling price of the produced xenon ranged from 554.42 to 1482.08 $/kgXe, which was more than 1000 $/kgXe lower than the current wholesale price of xenon. The electricity consumption of the proposed VPSA process was 40.99 kWh, and the calculated global warming potential was 28.92 kg CO<sub>2</sub> eq for 1 kg of Xe produced. Therefore, the proposed VPSA process was economical and environmentally sustainable","PeriodicalId":427,"journal":{"name":"Separation and Purification Technology","volume":"98 1","pages":""},"PeriodicalIF":8.6,"publicationDate":"2024-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142609783","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 recycling and environmentally friendly application of toxic metal cations from spent lithium-ion batteries is a global environmental challenge. This study utilizes the high structural tolerance of layered double hydroxides (LDHs) to synthesize high-entropy NiCoMnAlFe-LDHs from spent LiNi1-x-yMnxCoyO2 cathodes and liquid wastes, achieving efficient recovery of toxic metal cations. The obtained high-entropy NiCoMnAlFe-LDHs demonstrated rapid photo-thermal conversion capability driven by infrared radiation, generating localized high temperature on the surface of catalyst and rapidly catalyzing the hydrolysis of NaBH4 solution for hydrogen evolution. The hydrogen evolution rate reaches 1.72 mol·h−1·g−1·W−1 driven by 1050 nm infrared laser irradiation. The hydrolysis reaction of NaBH4 ceases immediately upon turning off the light source, allowing for controllable hydrogen release from NaBH4 and effectively solve the scientific challenges for NaBH4 as hydrogen carrier. This study offers a new approach for the recycling of spent lithium battery and the green utilization of hazardous materials.
{"title":"Recycling spent LiNi1-x-yMnxCoyO2 cathodes to high-entropy NiCoMnAlFe-LDHs for controllable hydrogen generation via NaBH4 hydrolysis","authors":"Qiaoqi Li, Xiaoyan Liu, Wenhao Xu, Keyi Zhang, Siyuan Zhang, Pengfei Teng, Niajia Wang, Xia Li, Lili Zhang","doi":"10.1016/j.seppur.2024.130418","DOIUrl":"https://doi.org/10.1016/j.seppur.2024.130418","url":null,"abstract":"The recycling and environmentally friendly application of toxic metal cations from spent lithium-ion batteries is a global environmental challenge. This study utilizes the high structural tolerance of layered double hydroxides (LDHs) to synthesize high-entropy NiCoMnAlFe-LDHs from spent LiNi<sub>1-</sub><strong><em><sub>x</sub></em></strong><sub>-</sub><strong><em><sub>y</sub></em></strong>Mn<strong><em><sub>x</sub></em></strong>Co<strong><em><sub>y</sub></em></strong>O<sub>2</sub> cathodes and liquid wastes, achieving efficient recovery of toxic metal cations. The obtained high-entropy NiCoMnAlFe-LDHs demonstrated rapid photo-thermal conversion capability driven by infrared radiation, generating localized high temperature on the surface of catalyst and rapidly catalyzing the hydrolysis of NaBH<sub>4</sub> solution for hydrogen evolution. The hydrogen evolution rate reaches 1.72 mol·h<sup>−1</sup>·g<sup>−1</sup>·W<sup>−1</sup> driven by 1050 nm infrared laser irradiation. The hydrolysis reaction of NaBH<sub>4</sub> ceases immediately upon turning off the light source, allowing for controllable hydrogen release from NaBH<sub>4</sub> and effectively solve the scientific challenges for NaBH<sub>4</sub> as hydrogen carrier. This study offers a new approach for the recycling of spent lithium battery and the green utilization of hazardous materials.","PeriodicalId":427,"journal":{"name":"Separation and Purification Technology","volume":"158 1","pages":""},"PeriodicalIF":8.6,"publicationDate":"2024-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142609788","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 : 2024-11-14DOI: 10.1016/j.seppur.2024.130548
Zheyuan Fan, Jiaqi Huang, Xiaoting Huang, Jian Li, Yu Xie, Jingxian Liu, Yun Ling, Weiwei Ye, Yongcun Ma, Yiqiao Wang
g-C3N4 is an excellent and affordable photocatalyst, but its weak built-in electric field slows down its photogenerated carrier separation rate. Meanwhile, modulating the interfacial electric field is also an effective way to increase the light-generated carrier separation efficiency. In this study, the built-in electric field of g-C3N4 is enhanced by using N vacancies (from 0.742 V to 0.868 V). Subsequently, the modified Nv-C3N4 (N0CN) is utilized to create a heterojunction with AgBr to generate a synergistic effect of built-in and interfacial electric fields (from 0.868 V to 1.032 V). The photogenerated carrier separation was significantly enhanced by the synergistic interaction of the dual electric fields, leading to a notable improvement in the photocatalytic efficiency of A-N0CN. The H2 production performance reached 1884.6 µmolg-1h−1, which was measured 1047 times higher than that of N0CN (1.8 µmolg-1h−1), A-CN (969.9 µmolg-1h−1) and CN (1.1 µmolg-1h−1), representing increases of 1.94 and 1713 times, respectively. This research offers a new perspective for catalyst design involving dual electric field synergy.
{"title":"Nitrogen-deficient C3N4 coupled with AgBr construction Z-scheme heterojunction form double electric field to promote photogenerated carrier separation enhancement hydrogen evolution","authors":"Zheyuan Fan, Jiaqi Huang, Xiaoting Huang, Jian Li, Yu Xie, Jingxian Liu, Yun Ling, Weiwei Ye, Yongcun Ma, Yiqiao Wang","doi":"10.1016/j.seppur.2024.130548","DOIUrl":"10.1016/j.seppur.2024.130548","url":null,"abstract":"<div><div>g-C<sub>3</sub>N<sub>4</sub> is an excellent and affordable photocatalyst, but its weak built-in electric field slows down its photogenerated carrier separation rate. Meanwhile, modulating the interfacial electric field is also an effective way to increase the light-generated carrier separation efficiency. In this study, the built-in electric field of g-C<sub>3</sub>N<sub>4</sub> is enhanced by using N vacancies (from 0.742 V to 0.868 V). Subsequently, the modified Nv-C<sub>3</sub>N<sub>4</sub> (N<sub>0</sub>CN) is utilized to create a heterojunction with AgBr to generate a synergistic effect of built-in and interfacial electric fields (from 0.868 V to 1.032 V). The photogenerated carrier separation was significantly enhanced by the synergistic interaction of the dual electric fields, leading to a notable improvement in the photocatalytic efficiency of A-N<sub>0</sub>CN. The H<sub>2</sub> production performance reached 1884.6 µmolg<sup>-1</sup>h<sup>−1</sup>, which was measured 1047 times higher than that of N<sub>0</sub>CN (1.8 µmolg<sup>-1</sup>h<sup>−1</sup>), A-CN (969.9 µmolg<sup>-1</sup>h<sup>−1</sup>) and CN (1.1 µmolg<sup>-1</sup>h<sup>−1</sup>), representing increases of 1.94 and 1713 times, respectively. This research offers a new perspective for catalyst design involving dual electric field synergy.</div></div>","PeriodicalId":427,"journal":{"name":"Separation and Purification Technology","volume":"359 ","pages":"Article 130548"},"PeriodicalIF":8.1,"publicationDate":"2024-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142610272","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 selective extraction of lithium ions (Li+) from salt lake brines holds substantial significance for environmental and energy applications. However, the effective extraction of Li+ is hindered by the low concentration of Li+ and the high Mg2+ to Li+ ratio in salt lakes. In this study, polyelectrolyte modified cation exchange membranes (CEMs) were prepared by coating poly(allylamine hydrochloride)/poly(sodium 4-styrenesulfonate) (PAH/PSS) bilayers using a layer-by-layer method, and their effects on the selective separation of Li+ and Mg2+ ions were investigated. By optimizing the bilayer number and current density, an average Li+/Mg2+ selectivity exceeding 10 was achieved. Increasing the bilayer number from 0.5 to 2.5 led to a rise in peak Li+/Mg2+ selectivity from 12.8 to 31.6, which was significantly higher than that of the unmodified CEM. An optimal Li+/Mg2+ selectivity of 97.2 was further achieved by increasing the current density to 2.0 mA/cm2. The mechanism of Li+/Mg2+ separation in PAH and PSS monolayers were also elucidated. PSS demonstrated a higher Li+ adsorption ability compared to Mg2+, while PAH enhanced Li+/Mg2+ selectivity through stronger electrostatic repulsion against Mg2+. This study highlights the potential of polyelectrolyte-modified membranes for Li+ extraction, inspiring a novel electrified process for the highly selective separation of valuable species using tailor-designed membranes with polyelectrolyte bilayers.
{"title":"A novel polyelectrolyte-modified membrane for selective lithium extraction from water in an electrified process","authors":"Ao Li, Yueting Wu, Qinghao Wu, Ruixue Zhao, Zihan Zhong, Ruotong Yang, Yuanfeng Liu, Xue Xia, Kuichang Zuo","doi":"10.1016/j.seppur.2024.130539","DOIUrl":"https://doi.org/10.1016/j.seppur.2024.130539","url":null,"abstract":"The selective extraction of lithium ions (Li<sup>+</sup>) from salt lake brines holds substantial significance for environmental and energy applications. However, the effective extraction of Li<sup>+</sup> is hindered by the low concentration of Li<sup>+</sup> and the high Mg<sup>2+</sup> to Li<sup>+</sup> ratio in salt lakes. In this study, polyelectrolyte modified cation exchange membranes (CEMs) were prepared by coating poly(allylamine hydrochloride)/poly(sodium 4-styrenesulfonate) (PAH/PSS) bilayers using a layer-by-layer method, and their effects on the selective separation of Li<sup>+</sup> and Mg<sup>2+</sup> ions were investigated. By optimizing the bilayer number and current density, an average Li<sup>+</sup>/Mg<sup>2+</sup> selectivity exceeding 10 was achieved. Increasing the bilayer number from 0.5 to 2.5 led to a rise in peak Li<sup>+</sup>/Mg<sup>2+</sup> selectivity from 12.8 to 31.6, which was significantly higher than that of the unmodified CEM. An optimal Li<sup>+</sup>/Mg<sup>2+</sup> selectivity of 97.2 was further achieved by increasing the current density to 2.0 mA/cm<sup>2</sup>. The mechanism of Li<sup>+</sup>/Mg<sup>2+</sup> separation in PAH and PSS monolayers were also elucidated. PSS demonstrated a higher Li<sup>+</sup> adsorption ability compared to Mg<sup>2+</sup>, while PAH enhanced Li<sup>+</sup>/Mg<sup>2+</sup> selectivity through stronger electrostatic repulsion against Mg<sup>2+</sup>. This study highlights the potential of polyelectrolyte-modified membranes for Li<sup>+</sup> extraction, inspiring a novel electrified process for the highly selective separation of valuable species using tailor-designed membranes with polyelectrolyte bilayers.","PeriodicalId":427,"journal":{"name":"Separation and Purification Technology","volume":"44 1","pages":""},"PeriodicalIF":8.6,"publicationDate":"2024-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142610320","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 : 2024-11-14DOI: 10.1016/j.seppur.2024.130426
Milana M. Mavinkurve, Yagnaseni Roy
Organic solvent nanofiltration (OSN) performance is influenced by several factors, including the solvent, membrane, transmembrane pressure, system size, flowrate, and desired end concentration. System design and optimization of such a complex process requires a unified framework so that the effect of each influence can be compared quantitatively in a single plot. To that effect, a mathematical framework was derived by functionally relating the target quantities (solute yield and solvent recovery) interconnected by the mass balances of each species. The plot obtained indicates solute-solvent selectivity, solute yield, solvent recovery, closeness to the saturation concentration, and a comparison of system sizes; hence when plotted for varied operating conditions and solvent-membrane systems, such a plot is instructive to improved system design. In the current paper, this framework is illustrated for OSN implemented for curcumin extract concentration. Two membranes (Evonik Puramem Performance, PMP, and Evonik Puramem Selective, PMS) were compared at various pressures on a single plot. The key output values obtained are solute yield, solvent recovery, system size comparison, and permeate bulk solute concentration. It was shown using the framework that when operated at 10 bar, the PMS membrane has a higher solute yield (180%); however, it requires a larger membrane area (25%) to reach saturation, compared to PMP. Finally, the effect of concentration polarization on the separation is demonstrated using the framework.
{"title":"Analytical framework for nanofiltration processes with imperfect rejection and its application to curcumin concentration","authors":"Milana M. Mavinkurve, Yagnaseni Roy","doi":"10.1016/j.seppur.2024.130426","DOIUrl":"https://doi.org/10.1016/j.seppur.2024.130426","url":null,"abstract":"Organic solvent nanofiltration (OSN) performance is influenced by several factors, including the solvent, membrane, transmembrane pressure, system size, flowrate, and desired end concentration. System design and optimization of such a complex process requires a unified framework so that the effect of each influence can be compared quantitatively in a single plot. To that effect, a mathematical framework was derived by functionally relating the target quantities (solute yield and solvent recovery) interconnected by the mass balances of each species. The plot obtained indicates solute-solvent selectivity, solute yield, solvent recovery, closeness to the saturation concentration, and a comparison of system sizes; hence when plotted for varied operating conditions and solvent-membrane systems, such a plot is instructive to improved system design. In the current paper, this framework is illustrated for OSN implemented for curcumin extract concentration. Two membranes (Evonik Puramem Performance, PMP, and Evonik Puramem Selective, PMS) were compared at various pressures on a single plot. The key output values obtained are solute yield, solvent recovery, system size comparison, and permeate bulk solute concentration. It was shown using the framework that when operated at 10 bar, the PMS membrane has a higher solute yield (180%); however, it requires a larger membrane area (25%) to reach saturation, compared to PMP. Finally, the effect of concentration polarization on the separation is demonstrated using the framework.","PeriodicalId":427,"journal":{"name":"Separation and Purification Technology","volume":"93 1","pages":""},"PeriodicalIF":8.6,"publicationDate":"2024-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142610273","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}
Manganese oxides (MnOx) exhibit considerable potential in the catalytic degradation of volatile organic compounds (VOCs) due to their excellent catalytic activity, superior stability and economic cost. In this work, a two-step calcination strategy was developed to prepare MnOx/CeO2 catalysts with low MnO bond strengths and highly active lattice oxygens. The obtained Mn4Ce1-NA after the optimization has a smaller grain size, enhanced specific surface area and weakened MnO bonds, which is attributed to the in situ restriction of the manganese oxides by the two-step calcination. Moreover, the entrance of Ce into the MnOx lattice further weakened the MnO bonds, leading to superior low-temperature reducibility and lattice oxygen activity, which effectively promoted the catalytic activity of the catalysts. The optimal samples displayed outstanding acetone degradation performance, capable of completing 90 % acetone conversion at 172 °C. The catalyst also exhibits excellent stability, with the conversion of acetone maintained at around 95 % for 64 h. This work contributes to a deeper understanding of reactive oxygen species in the catalytic oxidation of VOCs, while providing a new strategy for the rational design of efficient catalysts for the oxidation of VOCs.
{"title":"Boosting the catalytic performance of MnOx in acetone oxidation by weakening the MnO bond strength","authors":"Rui Han, Mingke Peng, Xueqian Wu, Caihong Pang, Yanfei Zheng, Caixia Liu, Qingling Liu","doi":"10.1016/j.seppur.2024.130540","DOIUrl":"https://doi.org/10.1016/j.seppur.2024.130540","url":null,"abstract":"Manganese oxides (MnO<sub>x</sub>) exhibit considerable potential in the catalytic degradation of volatile organic compounds (VOCs) due to their excellent catalytic activity, superior stability and economic cost. In this work, a two-step calcination strategy was developed to prepare MnO<sub>x</sub>/CeO<sub>2</sub> catalysts with low Mn<img alt=\"single bond\" src=\"https://sdfestaticassets-us-east-1.sciencedirectassets.com/shared-assets/55/entities/sbnd.gif\" style=\"vertical-align:middle\"/>O bond strengths and highly active lattice oxygens. The obtained Mn<sub>4</sub>Ce<sub>1</sub>-NA after the optimization has a smaller grain size, enhanced specific surface area and weakened Mn<img alt=\"single bond\" src=\"https://sdfestaticassets-us-east-1.sciencedirectassets.com/shared-assets/55/entities/sbnd.gif\" style=\"vertical-align:middle\"/>O bonds, which is attributed to the in situ restriction of the manganese oxides by the two-step calcination. Moreover, the entrance of Ce into the MnO<sub>x</sub> lattice further weakened the Mn<img alt=\"single bond\" src=\"https://sdfestaticassets-us-east-1.sciencedirectassets.com/shared-assets/55/entities/sbnd.gif\" style=\"vertical-align:middle\"/>O bonds, leading to superior low-temperature reducibility and lattice oxygen activity, which effectively promoted the catalytic activity of the catalysts. The optimal samples displayed outstanding acetone degradation performance, capable of completing 90 % acetone conversion at 172 °C. The catalyst also exhibits excellent stability, with the conversion of acetone maintained at around 95 % for 64 h. This work contributes to a deeper understanding of reactive oxygen species in the catalytic oxidation of VOCs, while providing a new strategy for the rational design of efficient catalysts for the oxidation of VOCs.","PeriodicalId":427,"journal":{"name":"Separation and Purification Technology","volume":"163 1","pages":""},"PeriodicalIF":8.6,"publicationDate":"2024-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142610567","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 : 2024-11-14DOI: 10.1016/j.seppur.2024.130546
Qing Wang , Ruofei Zhao , Haoran Li , Shaojing Sun , Yan Sun , Weimin Gu , Na Wang , Xuli Li
Photo-Fenton as the advanced oxidation technology shows great potential in water purification, which is limited by the sluggish reaction kinetics. Herein, oxygen vacancy-mediated Bi2WO6/FeOOH (Vo-BWO/FeOOH) heterojunction has been successfully constructed and performs superior performance for degradation antibiotic wastewater and antibiotic resistant bacteria (ARB) inactivation. The optimal photo-Fenton degradation rate for TCH achieves 0.0833 min−1 over oxygen vacancy-rich BWO/FeOOH (Vo-r-BWO/FeOOH). The degradation rate of tetracycline reached 100 % within 60 min, while the removal efficiency of E. coli resistant to tetracycline, ampicillin, and kanamycin was 94.1 % at 80 min. Moreover, Vo-r-BWO/FeOOH heterojunction also exhibits excellent durability, strong removal ability for multiple antibiotics and exceptional activity in a practical water environment. The comprehensive study of experiment and density functional theory (DFT) calculations confirms that the synergistic effect of oxygen vacancies accelerates the interfacial charge carriers’ migration and adsorption-activation of H2O2. Finally, the degradation pathway and toxicity of intermediates have been ascertained. This work provides a valuable strategy for the remediation of antibiotic wastewater resources.
{"title":"Oxygen vacancy-mediated Bi2WO6/FeOOH heterojunction for efficient photo-Fenton degradation antibiotics and synergistic sterilization","authors":"Qing Wang , Ruofei Zhao , Haoran Li , Shaojing Sun , Yan Sun , Weimin Gu , Na Wang , Xuli Li","doi":"10.1016/j.seppur.2024.130546","DOIUrl":"10.1016/j.seppur.2024.130546","url":null,"abstract":"<div><div>Photo-Fenton as the advanced oxidation technology shows great potential in water purification, which is limited by the sluggish reaction kinetics. Herein, oxygen vacancy-mediated Bi<sub>2</sub>WO<sub>6</sub>/FeOOH (Vo-BWO/FeOOH) heterojunction has been successfully constructed and performs superior performance for degradation antibiotic wastewater and antibiotic resistant bacteria (ARB) inactivation. The optimal photo-Fenton degradation rate for TCH achieves 0.0833 min<sup>−1</sup> over oxygen vacancy-rich BWO/FeOOH (Vo-r-BWO/FeOOH). The degradation rate of tetracycline reached 100 % within 60 min, while the removal efficiency of <em>E. coli</em> resistant to tetracycline, ampicillin, and kanamycin was 94.1 % at 80 min. Moreover, Vo-r-BWO/FeOOH heterojunction also exhibits excellent durability, strong removal ability for multiple antibiotics and exceptional activity in a practical water environment. The comprehensive study of experiment and density functional theory (DFT) calculations confirms that the synergistic effect of oxygen vacancies accelerates the interfacial charge carriers’ migration and adsorption-activation of H<sub>2</sub>O<sub>2</sub>. Finally, the degradation pathway and toxicity of intermediates have been ascertained. This work provides a valuable strategy for the remediation of antibiotic wastewater resources.</div></div>","PeriodicalId":427,"journal":{"name":"Separation and Purification Technology","volume":"359 ","pages":"Article 130546"},"PeriodicalIF":8.1,"publicationDate":"2024-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142610271","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}
O bond strengths and highly active lattice oxygens. The obtained Mn4Ce1-NA after the optimization has a smaller grain size, enhanced specific surface area and weakened Mn
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