Journal of Membrane Science最新文献_第2页

Electrostatic molecular engineering of honeycomb-like MXene membranes with ultra-short hydrophilic channels for high-efficiency dye/salt separation

IF 8.4 1区工程技术 Q1 ENGINEERING, CHEMICAL

Journal of Membrane Science

Pub Date : 2025-04-17 DOI: 10.1016/j.memsci.2025.124118

Peng Zu , Haoning Li , Xiao Huang , Guangming Yan , Xiujing Xing , Gang Zhang

In recent years, research in the field of dye/salt separation has been significantly progressed. However, issues such as poor permeability and low dye/salt separation factor remain unsolved. In response, we have developed a molecular engineering strategy to construct a MXene-based membrane with record-breaking performance. Crystal Violet (CV) molecules were initially used as electrostatic media to precisely adjust the interlayer spacing and orientation of MXene, resulting in the formation of an ordered honeycomb-like structure featuring three-dimensional interconnected channels. This configuration greatly shortened the pathways compared to traditional mass transfer channels. Theoretical calculations indicate that the CV molecules primarily engaged in strong interactions with the oxygen-containing functional groups on the surfaces of MXene layers, effectively regulating the hydrophilicity and steric hindrance effect within the channels. By introducing ECP 600JD Carbon (EC) particles as an intermediate layer, the self-defects of the composite membrane in the ultra-thin state were significantly repaired. Additionally, ultra-short hydrophilic mass transfer channels were established. As a consequence, Large Layered MXene@CV Ultra-thin Membrane/EC (LMCU/C) was successfully prepared, exhibiting excellent dye/salt separation performance and high permeability. This membrane demonstrated a permeance of 540.8 LMH/bar for CR/NaCl mixed solution, achieved a dye/salt separation factor of approximately 47, and maintained operational stability for 10 h, outperforming the majority of existing membranes. This work can provide fresh insights into strategies for designing membrane structures through molecular engineering.

{"title":"Electrostatic molecular engineering of honeycomb-like MXene membranes with ultra-short hydrophilic channels for high-efficiency dye/salt separation","authors":"Peng Zu , Haoning Li , Xiao Huang , Guangming Yan , Xiujing Xing , Gang Zhang","doi":"10.1016/j.memsci.2025.124118","DOIUrl":"10.1016/j.memsci.2025.124118","url":null,"abstract":"<div><div>In recent years, research in the field of dye/salt separation has been significantly progressed. However, issues such as poor permeability and low dye/salt separation factor remain unsolved. In response, we have developed a molecular engineering strategy to construct a MXene-based membrane with record-breaking performance. Crystal Violet (CV) molecules were initially used as electrostatic media to precisely adjust the interlayer spacing and orientation of MXene, resulting in the formation of an ordered honeycomb-like structure featuring three-dimensional interconnected channels. This configuration greatly shortened the pathways compared to traditional mass transfer channels. Theoretical calculations indicate that the CV molecules primarily engaged in strong interactions with the oxygen-containing functional groups on the surfaces of MXene layers, effectively regulating the hydrophilicity and steric hindrance effect within the channels. By introducing ECP 600JD Carbon (EC) particles as an intermediate layer, the self-defects of the composite membrane in the ultra-thin state were significantly repaired. Additionally, ultra-short hydrophilic mass transfer channels were established. As a consequence, Large Layered MXene@CV Ultra-thin Membrane/EC (LMCU/C) was successfully prepared, exhibiting excellent dye/salt separation performance and high permeability. This membrane demonstrated a permeance of 540.8 LMH/bar for CR/NaCl mixed solution, achieved a dye/salt separation factor of approximately 47, and maintained operational stability for 10 h, outperforming the majority of existing membranes. This work can provide fresh insights into strategies for designing membrane structures through molecular engineering.</div></div>","PeriodicalId":368,"journal":{"name":"Journal of Membrane Science","volume":"727 ","pages":"Article 124118"},"PeriodicalIF":8.4,"publicationDate":"2025-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143850838","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}

引用次数: 0

Polyethersulfone-modulated Matrimid®-derived carbon molecular sieve membranes for enhanced C3H6/C3H8 separation

IF 8.4 1区工程技术 Q1 ENGINEERING, CHEMICAL

Journal of Membrane Science

Pub Date : 2025-04-16 DOI: 10.1016/j.memsci.2025.124104

Fake Sun, Zeyuan Gao, Yongchao Sun, Yijun Liu, Jianyu Guan, Hongjin Li, Tianyou Li, Gaohong He, Canghai Ma

Polymer-derived carbon molecular sieve (CMS) membranes hold significant potentials for propylene/propane (C₃H₆/C₃H₈) separation; however, further enhancement of their molecular sieving properties remains a critical challenge. In this study, we present a novel approach to regulating the pore structure of CMS membranes by incorporating the rubbery polyethersulfone (PES) into the Matrimid® precursor to fabricate CMS membranes. The incorporation of PES during pyrolysis creates voids between Matrimid® molecular chains, increasing the chain d-spacing and the content of ultramicropores, significantly enhancing the C₃H₆/C₃H₈ separation performance of the CMS membranes. As the PES content in the precursor membrane increases, the rising content of ultramicropores leads to improved C₃H₆/C₃H₈ selectivity, along with a minor increase in gas permeability. Notably, the 60 %Matrimid®+40 %PES-550 CMS membrane displays a C₃H₆ permeability of 70.3 Barrer with a C₃H₆/C₃H₈ selectivity of 21.4, representing increases of 194 % and 188 %, respectively, compared to Matrimid®-550 and exceeding the C₃H₆/C₃H₈ separation upper bound. Furthermore, under mixed gas separation conditions with a 50/50 (mol%) C₃H₆/C₃H₈ feed, this membrane exhibited a C₃H₆ permeability of 47.6 Barrer with a C₃H₆/C₃H₈ selectivity of 18.3, also surpassing the mixed gas upper bound for C₃H₆/C₃H₈ separation. The design principle of CMS membranes in this work provides a new approach for the preparation of high-performance CMS membranes, with the potential for separating the challenging C₃H₆/C₃H₈ mixture.

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引用次数: 0

Huge improved gas separation performance of carbon molecular sieve membranes by incorporating polyimide COF into a linear polyimide precursor

IF 8.4 1区工程技术 Q1 ENGINEERING, CHEMICAL

Journal of Membrane Science

Pub Date : 2025-04-16 DOI: 10.1016/j.memsci.2025.124103

Aqib Riaz , Congcong Wu , Xuepeng Li , Muhammad Sarfraz , Luxin Sun , Lingyu Liu , Yunfei Song , Xiaohua Ma

Most of polyimide based carbon molecular sieve membranes (CMSM) are constrained by an inherent trade-off effect between CO₂ permeability and CO₂/CH₄ selectivity. In this work, a simple approach was developed to enhance the CO₂/CH₄ separation property of CMSMs by incorporating a triazine-containing polyimide-based covalent organic framework (PI–COF) into a linear polyimide precursor (PI). This incorporation induced the formation of a cross-linked structure within the PI matrix, followed by carbonization, to simultaneously achieve high CO₂ permeability and improved CO₂/CH₄ selectivity. The porous PI-COF particles were well dispersed in the carbon matrix and matched well with the matrix during pyrolysis. PI-550-C5 derived from the PI containing 5 % PI-COF exhibits higher S_BET (557 vs. 495 m²/g) and d-spacing (10.47 vs. 9.97 Å than pure PI-550. The CO₂ permeability of PI-550-C5 increased by 122 % (5962 vs. 2680 Barrer) compared to that of PI-550 and the CO₂/CH₄ selectivity was also increased by 39 %, coupled with excellent anti plasticization and mixed gas separation properties. The CO₂ permeability of PI-550-C5 was only 14 % less than pristine PI-550 membrane after 120 days and CO₂/CH₄ selectivity was increased 77 %. PI-550-C5 surpassed the Robeson Upper bounds for CO₂/CH₄, O₂/N₂ (2008, 2019) and CO₂/CH₄ (2018) in single- and mixed-gas tests, respectively, demonstrating exceptional permeability and selectivity. This work provides a potential approach to fabricate PI-based high performance CMSM with PI-COF filler for excellent gas separation performance.

大多数基于聚酰亚胺的碳分子筛膜（CMSM）都受到二氧化碳渗透性和二氧化碳/四氯化碳选择性之间固有的权衡效应的限制。在这项工作中，我们开发了一种简单的方法，通过在线性聚酰亚胺前体（PI）中加入一种含三嗪的聚酰亚胺共价有机框架（PI-COF）来增强 CMSM 的 CO2/CH4 分离性能。这种加入在 PI 基质中形成了交联结构，随后进行了碳化，从而同时实现了高二氧化碳渗透性和更好的二氧化碳/CH4 选择性。多孔 PI-COF 颗粒在碳基质中分散良好，在热解过程中与基质匹配良好。由含有 5% PI-COF 的 PI 制成的 PI-550-C5 与纯 PI-550 相比，具有更高的 SBET（557 比 495 m2/g）和 d 间距（10.47 比 9.97 Å）。与 PI-550 相比，PI-550-C5 的二氧化碳渗透率提高了 122%（5962 对 2680 巴勒），二氧化碳/CH4 选择性也提高了 39%，同时还具有优异的抗塑化和混合气体分离性能。120 天后，PI-550-C5 的二氧化碳渗透率仅比原始 PI-550 膜低 14%，二氧化碳/四氯化碳选择性提高了 77%。在单一气体和混合气体测试中，PI-550-C5 分别超过了 CO2/CH4、O2/N2（2008 年、2019 年）和 CO2/CH4（2018 年）的罗伯逊上限，显示出卓越的渗透性和选择性。这项工作为利用 PI-COF 填料制造具有优异气体分离性能的 PI 基高性能 CMSM 提供了一种潜在的方法。

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引用次数: 0

Natural products-based Janus hydrophilic/hydrophobic membrane for efficient scaling-resistance and photothermal membrane distillation

IF 8.4 1区工程技术 Q1 ENGINEERING, CHEMICAL

Journal of Membrane Science

Pub Date : 2025-04-16 DOI: 10.1016/j.memsci.2025.124100

Min Li , Nan Shang , Qi Liu , Jinheng Lei , Xun Zhou , Peiqing Zhang , Noreddine Ghaffour , Quan Feng , Zhenyu Li

Freshwater scarcity has gradually become a serious global water crisis that needs to be solved urgently. Membrane distillation (MD) has been regarded as a promising desalination technology due to its merits compared with other desalination technologies, including high rejection of non-volatile components and superior feed water salinity tolerance. However, the conventional MD faces several challenges, including thermal loss and membrane scaling. Here, we develop a natural products-based Janus sodium alginate/melanin nanoparticles-composited polyvinylidene fluoride membrane (SA-M-PVDF membrane) with outstanding photothermal effect and high hydrophilicity, which can allow the SA-M-PVDF membrane to present excellent photothermal membrane distillation (PMD) performance and scaling-resistance property respectively, thus can solve the hard problems of thermal loss and frequent membrane scaling. Moreover, owing to the biomaterial characters of melanin nanoparticles and SA, the synthesis of SA-M-PVDF membrane circumvents risk of secondary pollution to product water. As expected, the SA-M-PVDF membrane showed excellent PMD performance with 96.5 % solar energy utilization efficiency. The SA-M-PVDF membrane exhibited high scaling-resistance ability and robust structural stability, sustaining over 40 h of continuous PMD operation with high-salinity feed, prospectively providing a facile and environmental approach for sustainably alleviating the freshwater and energy shortage.

{"title":"Natural products-based Janus hydrophilic/hydrophobic membrane for efficient scaling-resistance and photothermal membrane distillation","authors":"Min Li , Nan Shang , Qi Liu , Jinheng Lei , Xun Zhou , Peiqing Zhang , Noreddine Ghaffour , Quan Feng , Zhenyu Li","doi":"10.1016/j.memsci.2025.124100","DOIUrl":"10.1016/j.memsci.2025.124100","url":null,"abstract":"<div><div>Freshwater scarcity has gradually become a serious global water crisis that needs to be solved urgently. Membrane distillation (MD) has been regarded as a promising desalination technology due to its merits compared with other desalination technologies, including high rejection of non-volatile components and superior feed water salinity tolerance. However, the conventional MD faces several challenges, including thermal loss and membrane scaling. Here, we develop a natural products-based Janus sodium alginate/melanin nanoparticles-composited polyvinylidene fluoride membrane (SA-M-PVDF membrane) with outstanding photothermal effect and high hydrophilicity, which can allow the SA-M-PVDF membrane to present excellent photothermal membrane distillation (PMD) performance and scaling-resistance property respectively, thus can solve the hard problems of thermal loss and frequent membrane scaling. Moreover, owing to the biomaterial characters of melanin nanoparticles and SA, the synthesis of SA-M-PVDF membrane circumvents risk of secondary pollution to product water. As expected, the SA-M-PVDF membrane showed excellent PMD performance with 96.5 % solar energy utilization efficiency. The SA-M-PVDF membrane exhibited high scaling-resistance ability and robust structural stability, sustaining over 40 h of continuous PMD operation with high-salinity feed, prospectively providing a facile and environmental approach for sustainably alleviating the freshwater and energy shortage.</div></div>","PeriodicalId":368,"journal":{"name":"Journal of Membrane Science","volume":"728 ","pages":"Article 124100"},"PeriodicalIF":8.4,"publicationDate":"2025-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143859751","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}

引用次数: 0

Fouling resistant nanofiltration membranes from self-assembled quaternary ammonium monomers

IF 8.4 1区工程技术 Q1 ENGINEERING, CHEMICAL

Journal of Membrane Science

Pub Date : 2025-04-14 DOI: 10.1016/j.memsci.2025.124101

Junkyu Hwang, Na Kyung Kim, Chinedum O. Osuji

Nanofiltration membranes with uniform and tunable pore sizes are highly sought after for wastewater treatment. Macromolecular organics and oily species are prevalent in wastewater streams and are challenging drivers of fouling that lead to decreased membrane performance. Efforts to reduce fouling therefore remain of interest in the development of new nanofiltration membranes. We report that nanostructured thin film composite membranes fabricated from a self-assembled mesophase of a polymerizable surfactant [2-(acryloyloxy)ethyl]dimethyl tetradecyl ammonium bromide (AETDAB) demonstrate excellent fouling resistance to protein solutions and oil-in-water emulsions. AETDAB lyotropic mesophases were cast atop a support membrane and crosslinked, forming hexagonally packed polymer cylinders arrayed in the plane of the membrane. The evenly spaced cylinders create channels with diameters of ∼1 nm that represent the transport limiting dimension for the system. The composite membranes showed outstanding antifouling characteristics, retaining ∼95 % of permeance over a 72-h period while completely rejecting a model organic foulant, bovine serum albumin (BSA). The membrane also demonstrated similarly strong fouling resistance during the filtration of oil-in-water emulsions, retaining ∼95 % of its permeance. The fouling resistance highlight the membrane's potential to be used for challenging nanofiltration applications, while retaining its performance over long periods of time.

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引用次数: 0

The membranes of V–Pd alloys: study of ultrapure hydrogen extraction from gas mixtures V-Pd 合金膜：从气体混合物中提取超纯氢的研究

IF 8.4 1区工程技术 Q1 ENGINEERING, CHEMICAL

Journal of Membrane Science

Pub Date : 2025-04-12 DOI: 10.1016/j.memsci.2025.124099

S.R. Kuzenov , V.N. Alimov , A.O. Busnyuk , I.V. Bobylev , E. Yu Peredistov , A.I. Livshits

The membranes of bcc V–Pd alloys are promising alternative to commercial membranes from Pd-based alloys. An optimum content of Pd in the alloy was found as 5.1 at% and 7.0 at% for the operations with the gas mixtures contenting H₂ at 0.66 MPa and 9.0 MPa respectively. The thin-walled tubular membranes made from these alloys and electrolessly plated inside and outside with Pd served as samples for the experimental research. The effects of gaseous products of CH₄ steam-and autothermal conversion on the membrane throughput and on the hydrogen extraction ratio were studied with the binary mixtures of 0.8H₂+0.2X (X = CO, CO₂, CH₄, N₂) as well as with 5-and 6-component mixtures (including steam). The reduction in hydrogen throughput caused by CO, CO₂ and CH₄ was clearly observed, but was relatively small and completely reversible. The tubular membranes of both alloys allowed to extract ≈80 % of hydrogen from the multi-component mixtures at their pressure 1.2 MPa, providing the density of hydrogen permeation flux of ≈0.5 scc/(cm²s) and total hydrogen flux exceeding 20 scc/s. It was found with mass analytical method that the hydrogen selectivity of V–Pd alloy membrane with respect to He (H₂/He) is no less than 3⋅10¹⁰.

{"title":"The membranes of V–Pd alloys: study of ultrapure hydrogen extraction from gas mixtures","authors":"S.R. Kuzenov , V.N. Alimov , A.O. Busnyuk , I.V. Bobylev , E. Yu Peredistov , A.I. Livshits","doi":"10.1016/j.memsci.2025.124099","DOIUrl":"10.1016/j.memsci.2025.124099","url":null,"abstract":"<div><div>The membranes of bcc V–Pd alloys are promising alternative to commercial membranes from Pd-based alloys. An optimum content of Pd in the alloy was found as 5.1 at% and 7.0 at% for the operations with the gas mixtures contenting H2 at 0.66 MPa and 9.0 MPa respectively. The thin-walled tubular membranes made from these alloys and electrolessly plated inside and outside with Pd served as samples for the experimental research. The effects of gaseous products of CH4 steam-and autothermal conversion on the membrane throughput and on the hydrogen extraction ratio were studied with the binary mixtures of 0.8H2+0.2X (X = CO, CO2, CH4, N2) as well as with 5-and 6-component mixtures (including steam). The reduction in hydrogen throughput caused by CO, CO2 and CH4 was clearly observed, but was relatively small and completely reversible. The tubular membranes of both alloys allowed to extract ≈80 % of hydrogen from the multi-component mixtures at their pressure 1.2 MPa, providing the density of hydrogen permeation flux of ≈0.5 scc/(cm2s) and total hydrogen flux exceeding 20 scc/s. It was found with mass analytical method that the hydrogen selectivity of V–Pd alloy membrane with respect to He (H2/He) is no less than 3⋅1010.</div></div>","PeriodicalId":368,"journal":{"name":"Journal of Membrane Science","volume":"727 ","pages":"Article 124099"},"PeriodicalIF":8.4,"publicationDate":"2025-04-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143830179","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}

引用次数: 0

Co-deposition enhances electrodialysis of thin film composite (TFC) membranes for efficient separation of Cl−/SO42-

IF 8.4 1区工程技术 Q1 ENGINEERING, CHEMICAL

Journal of Membrane Science

Pub Date : 2025-04-12 DOI: 10.1016/j.memsci.2025.124094

Penghao Hao , Xueqing Wang , Xue Yu , Chunyan Wang , Yinuo Zhang , Yang Liu , Ming Tan , Yang Zhang

The increasing demand for monovalent anion separation necessitates the development of highly efficient and cost-effective monovalent selective membrane. In this study, thin-film composite (TFC) membranes were fabricated via a co-deposition method and applied in an electrodialysis system for Cl⁻/SO₄²⁻ separation. The high density of amine groups in the membrane enhances ion exchange performance, while the dense cross-linked structure and residual carboxyl groups formed after the interfacial polymerization (IP) reaction restrict SO₄²⁻ transport due to limited pore size and strong electrostatic repulsion. In contrast, the membrane exhibits high permeability for Cl⁻, enabling efficient separation of the two anions. The TFC membrane prepared by IP followed by co-deposition of 0.2 wt% Polyethyleneimine (PEI) and 0.2 wt% dopamine (DA) demonstrated excellent separation performance. At a current density of 100 A m⁻², the flux of Cl⁻ was 24.62 × 10⁻⁷(mol·cm⁻²·min⁻¹), while the flux of SO₄²⁻ was only 0.31 × 10⁻⁷(mol·cm⁻²·min⁻¹), with a selection factor of 80.5, the selection factor is 17 times higher than that of commercial monovalent anion exchange membranes. The prepared TFC membranes exhibited excellent stability, maintaining consistent ionic fluxes of 23.79 × 10⁻⁷ mol cm⁻²·min⁻¹ for Cl⁻ and 0.27 × 10⁻⁷ mol cm⁻²·min⁻¹ for SO₄²⁻, respectively. Seven consecutive cycling experiments proves good stability of the membrane. This demonstrates their great potential for industrial applications.

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引用次数: 0

Improvement of H2/CO2 selectivity at high pressure and temperature of benzimidazole-linked hybrid membranes via post treatment

IF 8.4 1区工程技术 Q1 ENGINEERING, CHEMICAL

Journal of Membrane Science

Pub Date : 2025-04-12 DOI: 10.1016/j.memsci.2025.124096

Jiao Zhu , Zhecheng Guo , Zhi Wang , Xinlei Liu

H₂-selective membranes with high performance at high pressure and temperature are required. Here, we prepared high performance membranes for H₂/CO₂ separation by post treatment (in terms of crosslinking and thermal treatment) of CP-2-BILP molecular-scale hybrid membranes. Post crosslinking with TMC generated new amide linkages and compacted the membranes. So, the CP-2-BILP-0.4 %TMC membranes had an improved H₂/CO₂ selectivity of 65.5 (corresponding H₂ permeance of 35.6 GPU) at 11 bar (423 K) and an improved H₂/CO₂ selectivity of 41.7 (corresponding H₂ permeance of 515 GPU) at 573 K (1 bar). Post thermal treatment promoted further reaction of monomers and further formation of benzimidazole rings, and also compacted the membranes. Given by the synergistic effect of post crosslinking and thermal treatment, the CP-2-BILP-0.4 %TMC-423K membranes demonstrated a good pressure resistance. When the feed pressure was increased from 1 bar to 11 bar, the H₂/CO₂ selectivity of the membranes only decreased 10.2 % (74.5–66.9) and the H₂ permeance only slightly dropped (48.3 GPU to 44.1 GPU). The good H₂/CO₂ separation performance at high pressure and temperature, as well as good stability, demonstrated their potential for H₂ purification under industrial relevant process.

{"title":"Improvement of H2/CO2 selectivity at high pressure and temperature of benzimidazole-linked hybrid membranes via post treatment","authors":"Jiao Zhu , Zhecheng Guo , Zhi Wang , Xinlei Liu","doi":"10.1016/j.memsci.2025.124096","DOIUrl":"10.1016/j.memsci.2025.124096","url":null,"abstract":"<div><div>H2-selective membranes with high performance at high pressure and temperature are required. Here, we prepared high performance membranes for H2/CO2 separation by post treatment (in terms of crosslinking and thermal treatment) of CP-2-BILP molecular-scale hybrid membranes. Post crosslinking with TMC generated new amide linkages and compacted the membranes. So, the CP-2-BILP-0.4 %TMC membranes had an improved H2/CO2 selectivity of 65.5 (corresponding H2 permeance of 35.6 GPU) at 11 bar (423 K) and an improved H2/CO2 selectivity of 41.7 (corresponding H2 permeance of 515 GPU) at 573 K (1 bar). Post thermal treatment promoted further reaction of monomers and further formation of benzimidazole rings, and also compacted the membranes. Given by the synergistic effect of post crosslinking and thermal treatment, the CP-2-BILP-0.4 %TMC-423K membranes demonstrated a good pressure resistance. When the feed pressure was increased from 1 bar to 11 bar, the H2/CO2 selectivity of the membranes only decreased 10.2 % (74.5–66.9) and the H2 permeance only slightly dropped (48.3 GPU to 44.1 GPU). The good H2/CO2 separation performance at high pressure and temperature, as well as good stability, demonstrated their potential for H2 purification under industrial relevant process.</div></div>","PeriodicalId":368,"journal":{"name":"Journal of Membrane Science","volume":"727 ","pages":"Article 124096"},"PeriodicalIF":8.4,"publicationDate":"2025-04-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143825883","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}

引用次数: 0

Achieving complete remediation of tetracycline contaminated water using a PVDF/δ-MnO2 photocatalytic membrane reactor

IF 8.4 1区工程技术 Q1 ENGINEERING, CHEMICAL

Journal of Membrane Science

Pub Date : 2025-04-12 DOI: 10.1016/j.memsci.2025.124097

Lizette Ann Mendoza , Shih-Hong Liou , Irish Valerie Maggay , Gian Vincent Dizon , Yung Chang , Lemmuel L. Tayo , Chechia Hu , Antoine Venault

This study presents the development and evaluation of a novel photocatalytic membrane reactor (PMR) engineered for the efficient removal of tetracycline (TC) from water. δ-Manganese dioxide (δ-MnO₂) nanoparticles with a distinctive flower-like morphology were synthesized and thoroughly characterized to confirm their structure and surface properties. Following this, poly(vinylidene difluoride) (PVDF) membranes were manufactured via wet immersion process and then modified by coating them with the δ-MnO₂ catalyst to impart photocatalytic functionality. Testing the modified membranes revealed improved performance in TC rejection, albeit with a trade-off in flux, which decreased due to increased frictional resistance with higher δ-MnO₂ loading. Notably, the membrane with the highest coating concentration (M5) achieved a rejection rate of 96.1 %. This study further explored the degradation mechanism of TC by δ-MnO₂ under UV light, revealing the generation of reactive oxygen species such as hydroxyl radicals (•OH) and singlet oxygen (¹O₂), as well as valence band holes, all of which played pivotal roles in the decomposition of TC. Liquid Chromatography-Mass Spectrometry (LC/MS) analysis of the retentates and permeates confirmed effective TC degradation, showing a proportional decrease in TC concentration and an increase in intermediate formation with higher δ-MnO₂ content. Moreover, LC/MS analysis of permeates from the M5 membrane indicated complete TC removal, achieving 100 % elimination from wastewater in the PMR system. This approach shows strong potential for water purification and removing pharmaceutical contaminants by combining membrane separation and photocatalytic degradation within the PMR system.

本研究介绍了一种新型光催化膜反应器（PMR）的开发和评估情况，该反应器用于高效去除水中的四环素（TC）。研究人员合成了具有独特花朵状形态的 δ-二氧化锰（δ-MnO2）纳米粒子，并对其结构和表面特性进行了全面表征。随后，通过湿法浸泡工艺制造了聚偏二氟乙烯（PVDF）膜，并在膜上涂覆δ-MnO2 催化剂对其进行改性，以赋予其光催化功能。测试结果表明，改性膜的三氯乙酸排斥性能有所改善，但通量有所降低，原因是δ-MnO2负载量越高，摩擦阻力越大。值得注意的是，涂层浓度最高的膜（M5）达到了 96.1% 的抑制率。该研究进一步探讨了δ-MnO2 在紫外光下降解三氯甲烷的机理，揭示了羟基自由基（-OH）和单线态氧（1O2）等活性氧的生成以及价带空穴的产生，所有这些在三氯甲烷的分解过程中都发挥了关键作用。对回流物和渗透物进行的液相色谱-质谱（LC/MS）分析证实了三氯乙酸的有效降解，结果表明三氯乙酸浓度成比例地降低，而中间体的形成则随着 δ-MnO2 含量的增加而增加。此外，对来自 M5 膜的渗透物进行的 LC/MS 分析表明，三氯乙酸被完全去除，在 PMR 系统中，废水中的三氯乙酸去除率达到 100%。通过在 PMR 系统中结合膜分离和光催化降解，这种方法显示出在水净化和去除药物污染物方面的巨大潜力。

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引用次数: 0

Cellulose-based membrane with ion regulating function for high-safety lithium-ion battery at low temperature enabled by grafting structural engineering 通过接枝结构工程实现具有离子调节功能的纤维素基膜，用于低温下的高安全性锂离子电池

IF 8.4 1区工程技术 Q1 ENGINEERING, CHEMICAL

Journal of Membrane Science

Pub Date : 2025-04-11 DOI: 10.1016/j.memsci.2025.124093

Qi He , Kuo Li , Tu Ran , Shuhao Ruan , Xiaofei Yang , Yi Cheng , Haisong Wang

The separator plays an important role in determining the performance and cost of lithium-ion battery (LIBs). Biomass cellulose has been considered as a promising candidate to substitute the petroleum-based materials due to its biodegradability, high thermal stability and favorable wettability. However, the physical entanglement, hydrogen bonds and van der Waals force between the cellulose fibers results in small porosity and pore size, which make obstacles for electrolytes uptaking and Li⁺ migrating. Here the mesoporous cellulose-based membrane with ions regulating effect was designed by an approach of grafting structural engineering. The cross linking between the polymer with big molecules and the cellulose could effectively alleviate the aggregation of the cellulose fibers with the effect of steric hindrance. The grafted polymer with abundant –NH₂ functional groups have higher binding energy with the anions in the electrolyte as proved by DFT (density functional theoretical) calculation, which can restrict the movement of anions and accelerate Li⁺ transfer. The results indicate that the membrane has fast Li⁺ conductivity of 2.069 mS cm⁻¹. As separator for LIBs, it exhibits wide electrochemical stability window (up to 4.8 V) and enhanced rate/cycling performance even at extra low temperature (−30^oC).

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引用次数: 0