Journal of Membrane Science最新文献

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Threading MOF membranes with polymer chains for superior benzene/cyclohexane separation
IF 8.4 1区 工程技术
Journal of Membrane Science Pub Date : 2024-11-28 DOI: 10.1016/j.memsci.2024.123566
Caixia Wang , Bo Zhang , Shenzhen Cong , Chenglian Luo , Min Li , Zhecheng Guo , Zhi Wang , Xinlei Liu
{"title":"Threading MOF membranes with polymer chains for superior benzene/cyclohexane separation","authors":"Caixia Wang ,&nbsp;Bo Zhang ,&nbsp;Shenzhen Cong ,&nbsp;Chenglian Luo ,&nbsp;Min Li ,&nbsp;Zhecheng Guo ,&nbsp;Zhi Wang ,&nbsp;Xinlei Liu","doi":"10.1016/j.memsci.2024.123566","DOIUrl":"10.1016/j.memsci.2024.123566","url":null,"abstract":"<div><div>High performance membranes for benzene/cyclohexane separation are crucial. Metal–organic frameworks (MOFs), given by their high structural designability, are expected to provide satisfying membrane performance for this separation. In this study, polymer chains were threaded into the pores of MOF UiO-66, to reconstruct the structures of the membrane channels. The permeance of benzene and selectivity of benzene/cyclohexane were boosted simultaneously, compared with the bare UiO-66 membranes. The performance enhancement was rationalized since the solubility of benzene was improved meanwhile the diffusivity of cyclohexane dropped by virtue of the new adsorption sites of benzene and narrower membrane channels created by threading polymers. The as-synthesized polyvinyl alcohol (PVA)-threaded UiO-66 membranes exhibited a benzene permeance around 110 GPU and a benzene/cyclohexane selectivity around 30.</div></div>","PeriodicalId":368,"journal":{"name":"Journal of Membrane Science","volume":"717 ","pages":"Article 123566"},"PeriodicalIF":8.4,"publicationDate":"2024-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142756982","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
Thermal-modulated interfacial polymerization towards chlorine-resistant and dense polyester NF membranes for healthy drinking water
IF 8.4 1区 工程技术
Journal of Membrane Science Pub Date : 2024-11-28 DOI: 10.1016/j.memsci.2024.123565
Wenxin Yan , Guangxiang Ma , Xinwei Kang , Zhe Yang , Fengxia Zhang , Daoji Wu , Min Song , Meng Li , Daliang Xu , Xuewu Zhu
{"title":"Thermal-modulated interfacial polymerization towards chlorine-resistant and dense polyester NF membranes for healthy drinking water","authors":"Wenxin Yan ,&nbsp;Guangxiang Ma ,&nbsp;Xinwei Kang ,&nbsp;Zhe Yang ,&nbsp;Fengxia Zhang ,&nbsp;Daoji Wu ,&nbsp;Min Song ,&nbsp;Meng Li ,&nbsp;Daliang Xu ,&nbsp;Xuewu Zhu","doi":"10.1016/j.memsci.2024.123565","DOIUrl":"10.1016/j.memsci.2024.123565","url":null,"abstract":"<div><div>Low-pressure, chlorine-resistant polyester (PE) nanofiltration (NF) membranes achieving superior organic matter/mineral selectivity are a promising candidate for producing healthy drinking water. However, PE-based NF membranes are mostly loosely structured, and less effective in removing natural organic matter. In this work, a maltitol monomer with a distorted non-planar structure was used to precisely regulate the properties of PE-based dense NF membranes (DNF) by thermal-modulated interfacial polymerization (TIP). The <span>TIP</span> contributed to the fast formation of a dense and highly crosslinked PE network on the support. The prepared DNF membranes were highly hydrophilic and electronegative. The non-volatile Isopar G was chosen as an organic solvent to minimize the nanobubble effect on PE membrane surface roughness, resulting in a relatively smooth membrane surface. The optimized [email protected] membrane exhibited satisfactory water permeance (15.7 L m<sup>−2</sup> h<sup>−1</sup> bar<sup>−1</sup>), DOC rejection (79.6 %), and outstanding chlorine resistance (48,000 ppm h). This study provides a new strategy for tailoring high-performance PE-based DNF membranes to treat natural surface water for healthy drinking water.</div></div>","PeriodicalId":368,"journal":{"name":"Journal of Membrane Science","volume":"717 ","pages":"Article 123565"},"PeriodicalIF":8.4,"publicationDate":"2024-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142756980","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
Natural composite hydrogel regulated interface polymerization to prepare high performance nanofiltration membranes with wrinkled structure
IF 8.4 1区 工程技术
Journal of Membrane Science Pub Date : 2024-11-28 DOI: 10.1016/j.memsci.2024.123567
Xuan Wang , Yuxuan Yang , Zehua Li , Tiantian Li , Chunmei Niu , Ruolin Wang
{"title":"Natural composite hydrogel regulated interface polymerization to prepare high performance nanofiltration membranes with wrinkled structure","authors":"Xuan Wang ,&nbsp;Yuxuan Yang ,&nbsp;Zehua Li ,&nbsp;Tiantian Li ,&nbsp;Chunmei Niu ,&nbsp;Ruolin Wang","doi":"10.1016/j.memsci.2024.123567","DOIUrl":"10.1016/j.memsci.2024.123567","url":null,"abstract":"<div><div>Composite hydrogels offer significant potential in the development of nanofiltration membranes. Nonetheless, fabricating defect-free and ultra-thin polyamide membranes with wrinkled structure on three-dimensional composite hydrogel substrates through conventional interfacial polymerization remains a considerable challenge. Achieving both enhanced water permeability and ionic selectivity simultaneously is particularly challenging. In this study, a hydroxyl-enriched natural composite hydrogel, carboxyl methylated Astragalus gum/acid-soluble chitosan/multi-walled carboxylated carbon nanotubes (CTG/CS@CNT-COOH), was introduced as an intermediate layer to improve the process. This interlayer effectively enhanced PIP retention and reduced its diffusion rate into the organic phase by over 90 % through hydrogen bonding and physical barriers. The resulting polyamide layer, with a thickness of only 79.0 nm, exhibited a desirable wrinkled structure. SEM and AFM were employed to assess membrane morphology, while ATR-FTIR and XPS provided a detailed characterization of the membrane surface chemistry. The hydrophilicity and charge properties of various membranes were examined using water contact angle and zeta potential measurements. Notably, the modified thin-film composite membrane (TFC4) demonstrated exceptional pure water permeance, reaching 23.31 L m<sup>−2</sup> h<sup>−1</sup>·bar<sup>−1</sup>, compared to 8.63 L m<sup>−2</sup> h<sup>−1</sup>·bar<sup>−1</sup> for TFC membrane lacking the composite hydrogel, alongside a Na<sub>2</sub>SO<sub>4</sub> rejection rate of 98.38 %. Furthermore, the membrane exhibited strong fouling resistance and maintained structural integrity throughout extended filtration tests. This study presents a straightforward strategy for developing high-performance TFC membranes with enhanced efficiency.</div></div>","PeriodicalId":368,"journal":{"name":"Journal of Membrane Science","volume":"717 ","pages":"Article 123567"},"PeriodicalIF":8.4,"publicationDate":"2024-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142759030","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
Leveraging molecular scale free volume generation to improve gas separation performance of carbon molecular sieve membranes
IF 8.4 1区 工程技术
Journal of Membrane Science Pub Date : 2024-11-27 DOI: 10.1016/j.memsci.2024.123564
Steven Schlosser, Wulin Qiu, Zhongyun Liu, Zachary S. Campbell, William J. Koros
{"title":"Leveraging molecular scale free volume generation to improve gas separation performance of carbon molecular sieve membranes","authors":"Steven Schlosser,&nbsp;Wulin Qiu,&nbsp;Zhongyun Liu,&nbsp;Zachary S. Campbell,&nbsp;William J. Koros","doi":"10.1016/j.memsci.2024.123564","DOIUrl":"10.1016/j.memsci.2024.123564","url":null,"abstract":"<div><div>Carbon molecular sieve (CMS) membranes have proven to be promising candidates for next-generation gas separations. Modification of polymeric precursors is a critical tool that permits fine-tuning of CMS structure and performance for a wide variety of gas mixtures. Here, we make a targeted alteration to a polyimide CMS precursor through substitution of free-volume-generating trifluoromethyl groups for aliphatic methyl groups on the polymer backbone. Gas separation performance shows a vast improvement, demonstrated by up to an eightfold increase in gas permeability as well as higher mixed gas separation factors in some cases. We investigate these properties, and their dependence on pyrolysis temperature, with detailed measurements of gas sorption and permeation in CMS dense film membranes with additional analysis through classical materials characterization methods. Our observations indicate that addition of free-volume-generating groups into polymeric precursors is a powerful tool for developing state-of-the-art CMS membranes, especially in cases when high permeability is an important design parameter.</div></div>","PeriodicalId":368,"journal":{"name":"Journal of Membrane Science","volume":"717 ","pages":"Article 123564"},"PeriodicalIF":8.4,"publicationDate":"2024-11-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142745446","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
Novel guanidinium functionalized poly(pentafluorostyrene): Synthesis and application as ion-pair membrane in PA doped HT-PEMFC
IF 8.4 1区 工程技术
Journal of Membrane Science Pub Date : 2024-11-27 DOI: 10.1016/j.memsci.2024.123560
Hyeongrae Cho , Anja Krastel , Funda Arslan , Tobias Morawietz , Johannes Bender , Jochen Kerres , Vladimir Atanasov
{"title":"Novel guanidinium functionalized poly(pentafluorostyrene): Synthesis and application as ion-pair membrane in PA doped HT-PEMFC","authors":"Hyeongrae Cho ,&nbsp;Anja Krastel ,&nbsp;Funda Arslan ,&nbsp;Tobias Morawietz ,&nbsp;Johannes Bender ,&nbsp;Jochen Kerres ,&nbsp;Vladimir Atanasov","doi":"10.1016/j.memsci.2024.123560","DOIUrl":"10.1016/j.memsci.2024.123560","url":null,"abstract":"<div><div>Anion exchange membranes based on poly(pentafluorostyrene) (PPFSt) functionalized with tetramethylguanidinium are described in this study. By incorporating flexible thiohexyl groups onto PPFSt followed by functionalization with tetramethylguanidine and its quaternization with dimethylsulfate, free standing anion exchange membranes were fabricated. The resulting membranes were doped in phosphoric acid (PA) and applied for high temperature proton exchange membrane fuel cells (HT-PEMFCs). The 60 % thiohexylated and 40 % tetramethylguanidinium-functionalized PPFSt membrane (M-PPFSt-TH-TMG) showed higher phosphoric acid doping level (ADL) than <em>meta</em>-PBI (<em>m</em>-PBI) membrane: 13.5 PA/guanidinium to 4.9 PA/imidazole respectively. Conductivity of the M-PPFSt-TH-TMG membrane displayed 322 mS cm<sup>−1</sup> (ADL 13.5) and is therefore higher than the one of <em>m</em>-PBI membrane showing 203 mS cm<sup>−1</sup> (ADL 4.5) at 160 °C. The fuel cell performance was measured at 160 °C with non-humidified gases and without back pressure on both anode and cathode sides and compared with commercial MEA (Celtec-P 1100W). A PA doped M-PPFSt-TH-TMG MEA showed higher performance than the commercial one exhibiting 793 and 656 mW cm<sup>−2</sup> respectively measured under the same condition. The highest performance was obtained with the membrane M-PPFSt-TH-TMG: this membrane showed a peak power density of 1.31 W cm<sup>−2</sup> in H<sub>2</sub>/O<sub>2</sub> FC at 160 °C with 2 bars of backpressure on both anode and cathode sides. A stability test in FC showed no significant decay running at a constant current density of 217 mA cm<sup>−2</sup> at 160 °C with non-humidified gases for 100 h. An accelerated stress test (AST) carried out via thermal cycling between 80 and 160 °C with humidified gases showed rapid decay over the first 20 cycles, followed by stabilization.</div></div>","PeriodicalId":368,"journal":{"name":"Journal of Membrane Science","volume":"717 ","pages":"Article 123560"},"PeriodicalIF":8.4,"publicationDate":"2024-11-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142745447","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Rethinking nanofiltration membrane design for breaking the trade-off in Li/Mg separation: A comprehensive analysis based on the separation factor-lithium flux (S-JLi) framework
IF 8.4 1区 工程技术
Journal of Membrane Science Pub Date : 2024-11-26 DOI: 10.1016/j.memsci.2024.123558
Xiaohu Zhai , Jianyu Hu , Zhong Chu , Jinghang Zou , Xuesong Li , Zhiwei Wang
{"title":"Rethinking nanofiltration membrane design for breaking the trade-off in Li/Mg separation: A comprehensive analysis based on the separation factor-lithium flux (S-JLi) framework","authors":"Xiaohu Zhai ,&nbsp;Jianyu Hu ,&nbsp;Zhong Chu ,&nbsp;Jinghang Zou ,&nbsp;Xuesong Li ,&nbsp;Zhiwei Wang","doi":"10.1016/j.memsci.2024.123558","DOIUrl":"10.1016/j.memsci.2024.123558","url":null,"abstract":"<div><div>Nanofiltration (NF) membranes are crucial for lithium (Li) recovery from salt-lake brine, but efficient Li/magnesium (Mg) separation remains challenging. This study employs the recently proposed <em>S-J</em><sub>Li</sub> (separation factor vs Li flux) framework to evaluate NF membrane performance for Li/Mg separation, addressing limitations in traditional <em>S-A</em> (separation factor vs water permeance) frameworks. Using the Donnan Steric Pore Model with Dielectric Exclusion (DSPM-DE), we systematically investigate how operating conditions, feedwater properties, and membrane characteristics affect Li/Mg separation. Our results reveal that positively charged membranes outperform negatively charged ones, despite experiencing performance drops in high-salinity environments. We identify a trade-off between Li/Mg selectivity and Li flux that cannot be overcome by adjusting single membrane parameters. Multi-parameter synergistic regulation, particularly minimizing effective membrane thickness while optimizing charge density and pore size, emerges as a promising strategy to enhance separation performance. Our numerical simulations align well with experimental data, providing theoretical insights for designing high-performance Li/Mg separation membranes and emphasizing the importance of considering both selectivity and Li recovery in membrane development and evaluation.</div></div>","PeriodicalId":368,"journal":{"name":"Journal of Membrane Science","volume":"717 ","pages":"Article 123558"},"PeriodicalIF":8.4,"publicationDate":"2024-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142745448","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
Cross-layer alternating paired charge distribution to boost proton conductivity of COF lamellar membrane 跨层交替配对电荷分布提高 COF 层状膜的质子传导性
IF 8.4 1区 工程技术
Journal of Membrane Science Pub Date : 2024-11-26 DOI: 10.1016/j.memsci.2024.123556
Yuqing Xue, Xingke Yuan, Chongchong Chen, Wenpeng Li, Wenjia Wu, Zhirong Yang, Jingtao Wang
{"title":"Cross-layer alternating paired charge distribution to boost proton conductivity of COF lamellar membrane","authors":"Yuqing Xue,&nbsp;Xingke Yuan,&nbsp;Chongchong Chen,&nbsp;Wenpeng Li,&nbsp;Wenjia Wu,&nbsp;Zhirong Yang,&nbsp;Jingtao Wang","doi":"10.1016/j.memsci.2024.123556","DOIUrl":"10.1016/j.memsci.2024.123556","url":null,"abstract":"<div><div>Covalent organic frameworks (COFs) have attracted great interest for the development of proton exchange membranes (PEMs) in the field of hydrogen fuel cells. However, the Grotthuss mechanism of proton transfer fails to discriminate the preferential pathways on the complicated hydrogen-bond network, thus limiting cell performance. Herein, a heterocharged COF lamellar membrane with cross-layer alternating paired charge distribution was fabricated by alternately assembling the positively charged TpEB and negatively charged TpPa-SO<sub>3</sub>H nanosheets. We demonstrated that the TpEB nanosheet drives the proton to directional transfer along the hydrogen-bond network on the sulfonic acid periphery of TpPa-SO<sub>3</sub>H by significantly reducing ineffective motions in branched hydrogen-bond network for both through-plane and in-plane directions. Meanwhile, it provides a low absorption energy for proton transfer from the sulfonic acid shell. This assembly effect occurs within the three nanosheet layers during each alternate film formation (A<sub>3</sub>B<sub>3</sub>) and contributes to the long-term stability of the proton conductivity for TpEB@TpPa-SO<sub>3</sub>H. Notably, it achieves a maximum power density of 223 mW cm<sup>−2</sup> at 60 °C and 100 % RH, which is superior to those of 83 mW cm<sup>−2</sup> and 22 mW cm<sup>−2</sup> for the homocharged TpPa-SO<sub>3</sub>H and TpEB membranes, respectively. This work provides new insights into the design of high-conductivity PEMs from engineered COF membranes.</div></div>","PeriodicalId":368,"journal":{"name":"Journal of Membrane Science","volume":"717 ","pages":"Article 123556"},"PeriodicalIF":8.4,"publicationDate":"2024-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142723858","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
Interfacial polymerization of COF-polyamide composite membranes modified with ionic liquids for CO2 separations 离子液体修饰的 COF 聚酰胺复合膜的界面聚合,用于二氧化碳分离
IF 8.4 1区 工程技术
Journal of Membrane Science Pub Date : 2024-11-26 DOI: 10.1016/j.memsci.2024.123557
Yanting Tang , Qingnan Wang , Xiaohe Tian , Chenlu Liu , Keming Zhang , Xiaoting Feng , Rui Zhang , Yueyangchao Yu , Shaofei Wang
{"title":"Interfacial polymerization of COF-polyamide composite membranes modified with ionic liquids for CO2 separations","authors":"Yanting Tang ,&nbsp;Qingnan Wang ,&nbsp;Xiaohe Tian ,&nbsp;Chenlu Liu ,&nbsp;Keming Zhang ,&nbsp;Xiaoting Feng ,&nbsp;Rui Zhang ,&nbsp;Yueyangchao Yu ,&nbsp;Shaofei Wang","doi":"10.1016/j.memsci.2024.123557","DOIUrl":"10.1016/j.memsci.2024.123557","url":null,"abstract":"<div><div>Covalent organic frameworks (COFs), characterized by their well-organized porous structure, exhibit promising prospects for carbon capture. Nevertheless, their weak film-forming property and relatively large pore sizes constrain their utilization as gas separation membranes. This study introduced a facile approach to fabricating COF membranes tailored for CO<sub>2</sub> separations. By introducing an extra monomer, trimesoyl chloride (TMC), together with COF monomers, a thin and defect-free layer of COF-polyamide was synthesized by interfacial polymerization process. The amide structure embedded into the COFs layers was expected to mend the defects, strengthen the binding forces, and improve the stability of the COFs layers. To further enhance the performance, imidazolium ionic liquid (IL) was adopted to modify the COF-polyamide layer. The introduction of TMC rendered the COF-polyamide layer more negatively charged, facilitating stronger binding to the positively charged cations in the IL. This modification with IL effectively reduced the pore size of the COFs and increased the affinity for CO<sub>2</sub>. The resultant COF composite membranes exhibited a high CO<sub>2</sub> permeance of 125.9 GPU and CO<sub>2</sub>/N<sub>2</sub> selectivity up to 35.0, accompanied by robust long-term stability. Our method paves a new way for the fabrication and application of interfacial polymerized COF membranes for gas separation applications.</div></div>","PeriodicalId":368,"journal":{"name":"Journal of Membrane Science","volume":"717 ","pages":"Article 123557"},"PeriodicalIF":8.4,"publicationDate":"2024-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142723856","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
High performance anion exchange membrane containing large, rigid branching structural unit for fuel cell and electrodialysis applications 高性能阴离子交换膜,含有用于燃料电池和电渗析应用的大型刚性分支结构单元
IF 8.4 1区 工程技术
Journal of Membrane Science Pub Date : 2024-11-25 DOI: 10.1016/j.memsci.2024.123552
Long Han , Shoutao Gong , Haiyang Zhang , Min Yang , Omer Javed , Xiaoming Yan , Gaohong He , Fengxiang Zhang
{"title":"High performance anion exchange membrane containing large, rigid branching structural unit for fuel cell and electrodialysis applications","authors":"Long Han ,&nbsp;Shoutao Gong ,&nbsp;Haiyang Zhang ,&nbsp;Min Yang ,&nbsp;Omer Javed ,&nbsp;Xiaoming Yan ,&nbsp;Gaohong He ,&nbsp;Fengxiang Zhang","doi":"10.1016/j.memsci.2024.123552","DOIUrl":"10.1016/j.memsci.2024.123552","url":null,"abstract":"<div><div>Highly conductive and robust anion exchange membrane (AEM) is the key for development of alkali fuel cell and electrodialysis. We herein report novel, branched polyarylpiperidinium AEMs containing 1,3-dicarbazole-9-ylbenzene (DCB) unit. As a larger, more rigid branching unit relative to the conventional one, DCB can create higher fraction of free volume in the AEM, induce more significant microphase separation and better restrict water swelling of the membrane. The prepared qTPDCB-5.5 AEM exhibited an excellent hydroxide conductivity (175.3 mS cm<sup>−1</sup>) and a low swelling ratio (21 %) at 90 °C; when soaked in aqueous sodium hydroxide solution (2 mol/L, 80 °C) for 1000 h, qTPDCB-5.5 showed a high conductivity retention (96.5 %). Its hydrogen/oxygen fuel cell reached an impressive peak power density (1.83 W cm<sup>−2</sup>), and the qTPDCB-5.5 AEM did not experience appreciable structural decomposition after the cell worked at 0.2 A cm<sup>−2</sup> for 230 h (including &gt;100 h intermittent discharge). Owing to its high conductivity and swelling resistance, the qTPDCB-5.5 membrane also showed good performance in electrodialysis, and gave rise to low energy consumption (2.72 kWh kg<sup>−1</sup>) when used for desalinating 0.1 M NaCl solution. This work highlights the importance and provides the methodology of incorporating large, rigid branching unit in the structure of high performance AEM for fuel cell and electrodialysis applications.</div></div>","PeriodicalId":368,"journal":{"name":"Journal of Membrane Science","volume":"717 ","pages":"Article 123552"},"PeriodicalIF":8.4,"publicationDate":"2024-11-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142723860","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
Highly durable superhydrophobic bilayer nanofibrous composite membrane with intermediate interlocked network inspired by mortise and tenon connections for membrane distillation
IF 8.4 1区 工程技术
Journal of Membrane Science Pub Date : 2024-11-24 DOI: 10.1016/j.memsci.2024.123553
Luheng Jing , Tonghui Zhang , Siping Ding , Zheyi Meng , Xuefen Wang
{"title":"Highly durable superhydrophobic bilayer nanofibrous composite membrane with intermediate interlocked network inspired by mortise and tenon connections for membrane distillation","authors":"Luheng Jing ,&nbsp;Tonghui Zhang ,&nbsp;Siping Ding ,&nbsp;Zheyi Meng ,&nbsp;Xuefen Wang","doi":"10.1016/j.memsci.2024.123553","DOIUrl":"10.1016/j.memsci.2024.123553","url":null,"abstract":"<div><div>The membranes for membrane distillation (MD) posed challenges for long-term stable operation due to poor mechanical strength, low flux and susceptibility to wetting. In this study, inspired by conventional mortise and tenon (MT) structure, we constructed a novel robust and porous bilayer composite membrane consisting of superhydrophobic microsphere layer and nanofibrous substrate along with interfacial interlocked networks via a facile integrated casting-recrystallization (ICR) method for highly efficient direct contact membrane distillation (DCMD). During one-step ICR process, amorphous polypropylene (aPP) and isotactic polypropylene (iPP) (a-iPP) with certain mass ratio were completely dissolved in xylene and then cast on the surface of highly porous poly(vinylidene fluoride) (PVDF) nanofibrous substrate at high temperature, in which a crystallization process of the mixed solution occurred in a single step to form PP microsphere layer with a flower-like structure for guarantee of the superhydrophobicity and permeability of the composite membrane. Meanwhile, PP solution infiltrated into the PVDF nanofibrous substrate and then solidified along the fibers and fiber junctions at the initial pouring to create intermediate interlocking connections based on MT construction between the nanofibrous substrate and the microsphere layer, which resulted in the composite membrane with extremely high structural integrity and mechanical properties. The optimal a-iPP/PVDF composite membranes exhibited outstanding mechanical properties (36.6 MPa in tensile strength and 118.0% in strain), significantly superior to PVDF electrospun nanofibrous membrane and commercial PVDF membrane. This unique a-iPP composite membrane with unrelenting superhydrophobicity and high permeability demonstrated a complete barrier to salts with a considerable permeation flux of 54 kg m<sup>−2</sup> h<sup>−1</sup> in a 70-h DCMD test (ΔT = 40 °C).</div></div>","PeriodicalId":368,"journal":{"name":"Journal of Membrane Science","volume":"717 ","pages":"Article 123553"},"PeriodicalIF":8.4,"publicationDate":"2024-11-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142745445","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
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