Journal of Membrane Science最新文献

Amidoxime-functionalized PIM-1 incorporating defect-engineered ZIF-8 for enhanced propylene/propane separation and plasticization resistance

IF 8.4 1区工程技术

Journal of Membrane Science Pub Date : 2025-02-25 DOI: 10.1016/j.memsci.2025.123907

Hongjin Li, Yongchao Sun, Jianyu Guan, Lu Bai, Tianyou Li, Fake Sun, Yijun Liu, Gaohong He, Canghai Ma

{"title":"Amidoxime-functionalized PIM-1 incorporating defect-engineered ZIF-8 for enhanced propylene/propane separation and plasticization resistance","authors":"Hongjin Li, Yongchao Sun, Jianyu Guan, Lu Bai, Tianyou Li, Fake Sun, Yijun Liu, Gaohong He, Canghai Ma","doi":"10.1016/j.memsci.2025.123907","DOIUrl":"10.1016/j.memsci.2025.123907","url":null,"abstract":"<div><div>Mixed matrix membranes (MMMs), composed of polymers and fillers, capitalize on the complementary strengths of both materials, offering a promising approach for developing high-performance membranes for C<sub>3</sub>H<sub>6</sub>/C<sub>3</sub>H<sub>8</sub> separation. However, the effectiveness of MMMs is often hindered by poor interfacial compatibility between the polymer and the filler. To address this challenge, we present an effective strategy that simultaneously enhances both interfacial compatibility and gas separation performance in MMMs. By etching ZIF-8 with cyanuric acid (CA), we successfully synthesized defect-engineered ZIF-8 (DZIF-8), a hollow nanoframe structure that features open metal sites. These sites not only coordinate with the amidoxime groups of amidoxime-functionalized PIM-1 (AO-PIM-1) to improve interfacial compatibility but also significantly enhance the adsorption capacity for propylene. The resulting MMMs exhibited excellent interfacial compatibility with no observable filler agglomeration. Remarkably, the 10 % DZIF-8-based MMM enhances C<sub>3</sub>H<sub>6</sub> permeability to 492 and boosts C<sub>3</sub>H<sub>6</sub>/C<sub>3</sub>H<sub>8</sub> selectivity to 24. The defect-engineered MOF-based MMM (DMMM) surpassed the 2003 upper bound for C<sub>3</sub>H<sub>6</sub>/C<sub>3</sub>H<sub>8</sub> separation and demonstrated outstanding resistance to plasticization. Furthermore, the DMMM exceeded the 2008 Robeson upper bound for H<sub>2</sub>/CH<sub>4</sub>(N<sub>2</sub>) separation performance, highlighting its exceptional versatility. These results showcase the potential of defect-engineered MMMs in gas separation applications, particularly in high-performance C<sub>3</sub>H<sub>6</sub>/C<sub>3</sub>H<sub>8</sub> separation.</div></div>","PeriodicalId":368,"journal":{"name":"Journal of Membrane Science","volume":"722 ","pages":"Article 123907"},"PeriodicalIF":8.4,"publicationDate":"2025-02-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143511439","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

Loosely nanostructured polyamide membranes with rapid water transport for efficient molecule/ion separation

IF 8.4 1区工程技术

Journal of Membrane Science Pub Date : 2025-02-23 DOI: 10.1016/j.memsci.2025.123901

Zhen Lu , Xingming Wu , Baixue Liu , Zhenyu Yang , Yatao Zhang , Wenheng Jing , Shi-Peng Sun , Junyong Zhu

{"title":"Loosely nanostructured polyamide membranes with rapid water transport for efficient molecule/ion separation","authors":"Zhen Lu , Xingming Wu , Baixue Liu , Zhenyu Yang , Yatao Zhang , Wenheng Jing , Shi-Peng Sun , Junyong Zhu","doi":"10.1016/j.memsci.2025.123901","DOIUrl":"10.1016/j.memsci.2025.123901","url":null,"abstract":"<div><div>Highly permeable nanofiltration membranes comprising selective polyamide nanofilms hold significant promise for energy-efficient molecule/ion separations. However, current polyamide-based nanofiltration membranes, made through polymerization between highly reactive piperazine and triacyl chloride, exhibiting high retention of divalent salts, limiting their applicability for molecule/ion separations such as dye or antibiotics desalination. Herein, we report the fabrication of a loosely nanostructured poly(bipiperidine-amide) membrane via dorsal coating interfacial polymerization (DC-IP) using Kevlar hydrogel as porous support. The hydrogen-bonding and electrostatic interaction between bipiperidine and Kevlar hydrogel play a role in the formation of winkled ring-shaped nanostructures, which effectively enhance water transport area. By employing 4,4′-bipiperidine, a nonplanar monomer with a longer reaction size distance, the resulting membranes exhibited higher free volume and stronger pore connectivity compared to poly(piperazine-amide) counterparts, as evidenced by both experimental and simulation analyses. The impact of monomer concentration and solution pH on the DC-IP parameters influencing membrane separation performance was thoroughly investigated. Importantly, the optimized polyamide membranes demonstrated an exceptional water permeance of 70.1 L m<sup>−2</sup> h<sup>−1</sup> bar<sup>−1</sup>, high dye removal efficiency (Congo red, 99.4 %), and low divalent salt rejection (Na<sub>2</sub>SO<sub>4</sub>, 38.6 %). Furthermore, the membranes exhibited high antifouling capability and long-term operational stability, rendering them highly promising for rapid and durable dye/salt separations. This study underscores the potential of utilizing moderately reactive bipiperidine to fabricate high-porosity polyamide membranes for fast molecule/ion separation.</div></div>","PeriodicalId":368,"journal":{"name":"Journal of Membrane Science","volume":"722 ","pages":"Article 123901"},"PeriodicalIF":8.4,"publicationDate":"2025-02-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143478728","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

Quorum quenching driven microbial community to biofouling control in membrane bioreactor for landfill leachate treatment

IF 8.4 1区工程技术

Journal of Membrane Science Pub Date : 2025-02-23 DOI: 10.1016/j.memsci.2025.123899

Junjie Zhu , Wei Xu , Yuwei Yang , Xiaomei Su , Xiao Xiao , Feng Dong , Hailu Fu , Chongjun Chen , Jianrong Chen , Faqian Sun

{"title":"Quorum quenching driven microbial community to biofouling control in membrane bioreactor for landfill leachate treatment","authors":"Junjie Zhu , Wei Xu , Yuwei Yang , Xiaomei Su , Xiao Xiao , Feng Dong , Hailu Fu , Chongjun Chen , Jianrong Chen , Faqian Sun","doi":"10.1016/j.memsci.2025.123899","DOIUrl":"10.1016/j.memsci.2025.123899","url":null,"abstract":"<div><div>Membrane bioreactor (MBR) has been widely applied in landfill leachate treatment, with significant efforts focusing on sustainable and non-toxic strategies for biofouling mitigation. This study investigated the potential of the quorum quenching (QQ) bacterium <em>Brucella</em> sp. ZJ1 to control biofouling in a MBR system treating landfill leachate. Results demonstrate that QQ-MBR extended the time to reach a transmembrane pressure of 35 kPa by 3∼10-fold compared with the control. After being operated in MBR for 40 days, QQ beads retained about 40 % of their quorum sensing (QS) signals degradation activity. Biofouling reduction was driven by surface scouring, alongside a notable QQ effect, evidenced by 27–41 % lower extracellular polymeric substance (EPS) concentrations and 60 % lower QS signal levels. Metagenomic analysis revealed that QQ beads significantly reduced QS-related and EPS production genes while increasing QQ-related genes in the membrane biocake, effectively mitigating biofouling. This study highlighted the role of QQ in reshaping the microbial community to sustainably reduce biofouling in landfill leachate MBR treatment.</div></div>","PeriodicalId":368,"journal":{"name":"Journal of Membrane Science","volume":"722 ","pages":"Article 123899"},"PeriodicalIF":8.4,"publicationDate":"2025-02-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143509824","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

PPS/TA-PEI/CaAlg/ZIF-8 composite membranes with under-liquid dual superlyophobicity for on-demand separation of oil-water emulsions

IF 8.4 1区工程技术

Journal of Membrane Science Pub Date : 2025-02-21 DOI: 10.1016/j.memsci.2025.123897

Shiwei Tian , Yaqi Zhang , Qiankun Sha , Yixuan Wang , Xingxiang Zhang , Xuhuan Yan , Na Han

{"title":"PPS/TA-PEI/CaAlg/ZIF-8 composite membranes with under-liquid dual superlyophobicity for on-demand separation of oil-water emulsions","authors":"Shiwei Tian , Yaqi Zhang , Qiankun Sha , Yixuan Wang , Xingxiang Zhang , Xuhuan Yan , Na Han","doi":"10.1016/j.memsci.2025.123897","DOIUrl":"10.1016/j.memsci.2025.123897","url":null,"abstract":"<div><div>Polyphenylene sulfide (PPS) membrane materials have attracted significant attention for separating oily wastewater due to their remarkable separation precision and permeation capability. Nevertheless, the inherent hydrophobic characteristics result in a single wetting property, which restricts their broad applicability in treating diverse types of oily wastewater. In this study, the PPS/TA-PEI/CaAlg/ZIF-8 composite membranes exhibit outstanding under-liquid dual superlyophobicity, which were formed via constructing a composite coating containing polyphenol-polycation and calcium alginate (CaAlg) hydrogel, and assembling ZIF-8 nanocrystals with suitable surface chemistry. Through the solvent pre-wetting approach, the surface wettability of the PPS composite membranes can be flexibly transitioned between under-water superoleophobicity and under-oil superhydrophobicity, thus realizing on-demand separation of oily wastewater. It is noteworthy that the treatment efficiency of the PPS/TA-PEI/CaAlg/ZIF-8 composite membranes for the various oil-water mixtures (surfactant-free) and emulsions (stabilized by surfactants) attained greater than 98.1 %. Meanwhile, the rapid transport capability of diverse types of oil-water emulsions can also be exhibited, with a permeance of 1652.4 L m<sup>−2</sup> h<sup>−1</sup> bar<sup>−1</sup> for water-in-oil (W/O) emulsions and 2087.5 L m<sup>−2</sup> h<sup>−1</sup> bar<sup>−1</sup> for oil-in-water (O/W) emulsions. In addition, the PPS composite membranes demonstrated outstanding anti-fouling capacity, recyclability, and switchable separation capacity. This work extended the utilization of the PPS membrane material in the controllable treatment of oily wastewater.</div></div>","PeriodicalId":368,"journal":{"name":"Journal of Membrane Science","volume":"722 ","pages":"Article 123897"},"PeriodicalIF":8.4,"publicationDate":"2025-02-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143509288","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 insight into dual-polyamide layer composite nanofiltration membrane toward enhanced ion selective performance

IF 8.4 1区工程技术

Journal of Membrane Science Pub Date : 2025-02-21 DOI: 10.1016/j.memsci.2025.123895

Cunxian Lai , Wentian Zhang , Lichao Xia , Fangang Meng , Shanshan Zhao

{"title":"Novel insight into dual-polyamide layer composite nanofiltration membrane toward enhanced ion selective performance","authors":"Cunxian Lai , Wentian Zhang , Lichao Xia , Fangang Meng , Shanshan Zhao","doi":"10.1016/j.memsci.2025.123895","DOIUrl":"10.1016/j.memsci.2025.123895","url":null,"abstract":"<div><div>High-performance thin-film composite (TFC) nanofiltration (NF) membranes featuring suitable pore size and appropriate charge density are critical for achieving high ion selectivity. Herein, a secondary interfacial polymerization (SIP) strategy was proposed to prepare TFC NF membrane with dual-polyamide (PA) layer structure using polyethylenimine (PEI) and piperazine (PIP) as aqueous monomers in sequence. The first PEI-PA layer with a smoother surface and uniform pore size distribution serves as an interlayer for the SIP, contributing to the uniform distribution of PIP monomers and producing a controllable regulation of the SIP reaction. The resultant NF membrane featured thinner thickness, smoother surface, denser pore size, and asymmetric charge properties, achieving greater than 99 % rejections of five heavy metals (Cu<sup>2+</sup>, Mn<sup>2+</sup>, Zn<sup>2+</sup>, Ni<sup>2+</sup>, Co<sup>2+</sup>) during mixed salts solution filtration test at concentration range of 100–2000 mg L<sup>−1</sup>. More importantly, the unique dual-PA layer NF membrane achieved an excellent selectivity of Li<sup>+</sup> and Mg<sup>2+</sup>of 79.1 under the combined effects of pore size exclusion and charge repulsion. Interestingly, its pure water permeance (13.5 L m<sup>−2</sup> h<sup>−1</sup> bar<sup>−1</sup>) was increased by about 35 % due to the “gutter effect” between the bilayers in comparison with the monolayer PA membrane. Moreover, the transition state theory was introduced to analyze the partition and diffusion energy barriers of salts during filtration. Our work demonstrates that the SIP strategy is promising for realizing ultra-high solute-selective NF membrane.</div></div>","PeriodicalId":368,"journal":{"name":"Journal of Membrane Science","volume":"722 ","pages":"Article 123895"},"PeriodicalIF":8.4,"publicationDate":"2025-02-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143509825","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

Sulfonated polysulfone composite membranes with tailored interfacial hydrogen bond network for efficient proton exchange membrane water electrolysis

IF 8.4 1区工程技术

Journal of Membrane Science Pub Date : 2025-02-21 DOI: 10.1016/j.memsci.2025.123885

Zongwu Zhang , Ziqian Xiang , Fengjin Qu , Jun Wang , Hua Yang , Jun Li , Barbara Mecheri , Alessandra D'Epifanio , Tengjiao Ou , Fang Chen , Xiaoyan Ma

{"title":"Sulfonated polysulfone composite membranes with tailored interfacial hydrogen bond network for efficient proton exchange membrane water electrolysis","authors":"Zongwu Zhang , Ziqian Xiang , Fengjin Qu , Jun Wang , Hua Yang , Jun Li , Barbara Mecheri , Alessandra D'Epifanio , Tengjiao Ou , Fang Chen , Xiaoyan Ma","doi":"10.1016/j.memsci.2025.123885","DOIUrl":"10.1016/j.memsci.2025.123885","url":null,"abstract":"<div><div>Both chemical compositions of ionomers and surface properties of nanofillers significantly impact the performances of composite proton exchange membranes (PEMs) for water electrolysis. Despite progress in optimizing the chemical compositions of ionomers, it remains challenging to rationally modulate the micro/nano interface between nanofillers and ionomers due to the undesirable surface functionalization of nanofillers. In this study, core-shell silica@poly(1-vinylimidazole) (SiO<sub>2</sub>@PVI) nanoparticles with tunable grafting densities are fabricated via sonochemical technique and incorporated into sulfonated polysulfone (SPSF60) ionomer. The SiO<sub>2</sub>@PVI nanoparticles strengthen the interfacial hydrogen bond with SPSF60 by elevating the surface tethered imidazole groups, yielding a customizable interfacial network that further boosts the proton conductivity and stability of SPSF60/SiO<sub>2</sub>@PVI membranes. As a result, integrating the SPSF60/SiO<sub>2</sub>@PVI-12C membrane into a water electrolyzer achieves an exceptional operating current density of 5.84 A/cm<sup>2</sup> at 2.0 V and 80 °C, which is 31.2 % higher than that with pure SPSF60. Moreover, the electrolyzer's durability is doubled due to the enhanced stability of the modified membrane. This study underscores the critical role of ionomer/filler interfacial structure on properties of composite PEMs, presenting an effective strategy to enhance the performance of proton exchange membranes for water electrolysis through interface modulation.</div></div>","PeriodicalId":368,"journal":{"name":"Journal of Membrane Science","volume":"722 ","pages":"Article 123885"},"PeriodicalIF":8.4,"publicationDate":"2025-02-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143509823","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

Design of gradient polyamide membrane for anti-fouling high-performance reverse osmosis desalination

IF 8.4 1区工程技术

Journal of Membrane Science Pub Date : 2025-02-21 DOI: 10.1016/j.memsci.2025.123881

Qian Yang , Lin Cao , Ling Tan , Jing Li , Shanshan Zhao , Miao Tian

{"title":"Design of gradient polyamide membrane for anti-fouling high-performance reverse osmosis desalination","authors":"Qian Yang , Lin Cao , Ling Tan , Jing Li , Shanshan Zhao , Miao Tian","doi":"10.1016/j.memsci.2025.123881","DOIUrl":"10.1016/j.memsci.2025.123881","url":null,"abstract":"<div><div>Interfacial polymerization (IP) has been extensively utilized for fabrication of polyamide (PA) membranes. The PA selective layer synthesized via IP typically exhibits a ridge and valley loose upper layer and dense lower layer, leading to issues such as membrane fouling and flux decline due to contaminant adhesion and passage. Previous studies have been devoted to addressing the perm-selectivity trade-off in PA, with little attention paid to tuning the PA structure in gradient to control membrane permeance and selectivity and investigate its impact on fouling resistance. In this study, the crosslinking structure of the PA selective layer in gradient was regulated by modulating the internal structure of sodium alginate (SA) by pre-crosslinking with Ca<sup>2+</sup>, producing a pyramid membrane (Ca/SA-0.04) with a dense upper layer and a looser lower layer. The dense upper PA layer effectively retains salt, achieving a NaCl rejection of 99.10 %. The loose lower layer, formed by the interwoven crosslinking of PA and SA, provided high salt water flux (1.08 Lm<sup>−2</sup>h<sup>−1</sup>bar<sup>−1</sup>) due to the ease of the Ca/SA chains de-crosslinking in NaCl solution, outperforming conventional prepared membranes by 46.57 %. Additionally, in fouling tests, the Ca/SA-0.04 membrane demonstrated excellent anti-fouling performance against Humic acid and Bovine Serum Albumin, with a flux decline rate below 17 % and a flux recovery rate exceeding 93 %. Our study proposes an innovative strategy for designing PA RO membranes with superior perm-selectivity and anti-fouling efficiency.</div></div>","PeriodicalId":368,"journal":{"name":"Journal of Membrane Science","volume":"722 ","pages":"Article 123881"},"PeriodicalIF":8.4,"publicationDate":"2025-02-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143509826","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

Functionalized ultrafiltration membrane with complementary adsorption and self-cleaning performances by blending-to-entrapping modification

IF 8.4 1区工程技术

Journal of Membrane Science Pub Date : 2025-02-21 DOI: 10.1016/j.memsci.2025.123886

Song Liu , Qianqian Liu , Yun Cai , Xuemei Bao , Wenyao Zhou , Yang Yang

{"title":"Functionalized ultrafiltration membrane with complementary adsorption and self-cleaning performances by blending-to-entrapping modification","authors":"Song Liu , Qianqian Liu , Yun Cai , Xuemei Bao , Wenyao Zhou , Yang Yang","doi":"10.1016/j.memsci.2025.123886","DOIUrl":"10.1016/j.memsci.2025.123886","url":null,"abstract":"<div><div>Combining membrane ultrafiltration with adsorption and advanced oxidation processes is considered to be an efficient strategy to improve removal capacity, alleviate membrane fouling and extend membrane lifespan for the treatment of wastewater with complex organic pollutants. The removal efficiency of small-molecule pollutants is closely related to the amount of adsorption sites, which is limited with the loading level of adsorbents. Herein, we proposed a blending-to-entrapping two-step method to load spherical resorcinol-formaldehyde (RF) resins, a metal-free photocatalyst with phenolic hydroxyl groups on surface, utmost possibly in the polyethersulfone (PES) membrane for removing small-molecule cationic pollutants from aqueous solution in an ultrafiltration process. By entrapping adequate RF resin microspheres in the finger-like pores of a PES ultrafiltration (UF) membrane blended with the RF resin microspheres, the obtained membrane possessed ultrafiltration and adsorption simultaneously based on pore size exclusion effect and electrostatic attraction, respectively. Owning to the photocatalytic <em>in situ</em> H<sub>2</sub>O<sub>2</sub> production ability of RF resins, the membrane also showed good reusability through a visible-light-induced self-cleaning process based on Fenton reaction. This work provides a feasible strategy to construct renewable adsorptive composite UF membranes for complex wastewater treatment.</div></div>","PeriodicalId":368,"journal":{"name":"Journal of Membrane Science","volume":"722 ","pages":"Article 123886"},"PeriodicalIF":8.4,"publicationDate":"2025-02-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143487560","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

Engineering charge spatial distribution and transport highways in mix-charged polyamide nanofilms for ultra-permselective Li+/Mg2+ separation

IF 8.4 1区工程技术

Journal of Membrane Science Pub Date : 2025-02-20 DOI: 10.1016/j.memsci.2025.123882

Ping Hu , Minzheng Yu , Mengyang Yang , Zewen Xu , Dongxiao Yang , Haojie Song , Xiaozhuan Zhang , Meng You , Bingbing Yuan , Q. Jason Niu

{"title":"Engineering charge spatial distribution and transport highways in mix-charged polyamide nanofilms for ultra-permselective Li+/Mg2+ separation","authors":"Ping Hu , Minzheng Yu , Mengyang Yang , Zewen Xu , Dongxiao Yang , Haojie Song , Xiaozhuan Zhang , Meng You , Bingbing Yuan , Q. Jason Niu","doi":"10.1016/j.memsci.2025.123882","DOIUrl":"10.1016/j.memsci.2025.123882","url":null,"abstract":"<div><div>In addition to pore structure and surface charge, the charge spatial distribution within NF membranes plays a crucial role in ion transport process. However, precisely tuning this charge distribution remains a significant challenge. Here, we construct the mix-charged thin-film nanocomposite (m-TFN) membranes with tailorable charge spatial distribution for highly efficient Li<sup>+</sup>/Mg<sup>2+</sup> separation by incorporating quaternary ammonium-functionalized UiO-66-QA nanocrystals into the interfacial polymerization process. The UiO-66-QA nanocrystals are synthesized via a facile post-synthetic modification. The addition of UiO-66-QA nanocrystals benefits to narrow pore size distribution and lower inner negative charge of the mix-charged polyamide nanofilms. Furthermore, these nanocrystals serve as both templates for ordered nanostructure formation and additional transport pathways, significantly enhancing water permeance. As a result, the m-TFN membranes, characterized by a heterogeneous charge distribution and uniform pore structure, exhibit remarkable Li<sup>+</sup>/Mg<sup>2+</sup> selectivity of 323.93, along with competitive salt/water flux ranging from 227.22 ± 13.3 to 250.2 ± 7.4 L m<sup>−2</sup> h<sup>−1</sup>, striking a better trade-off between Li<sup>+</sup>/Mg<sup>2+</sup> selectivity and permeability. Moreover, the SDEM model analysis further reveals that it evidences a higher Li purity and Li recovery compared to current state-of-the-art NF membranes. This work presents a promising strategy for fine-tuning charge distribution and pore structure to achieve high-performance ion separation.</div></div>","PeriodicalId":368,"journal":{"name":"Journal of Membrane Science","volume":"722 ","pages":"Article 123882"},"PeriodicalIF":8.4,"publicationDate":"2025-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143463449","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

Sustainable and exceptional Li+ /Mg2+selectivity through electrocoagulation enhanced triamino guanidine modified membrane

IF 8.4 1区工程技术

Journal of Membrane Science Pub Date : 2025-02-20 DOI: 10.1016/j.memsci.2025.123884

Bin Liu , Xinyue Cui , Xiaozhen Lu , Xuewu Zhu , Lin Wang , Junyong Zhu

{"title":"Sustainable and exceptional Li+ /Mg2+selectivity through electrocoagulation enhanced triamino guanidine modified membrane","authors":"Bin Liu , Xinyue Cui , Xiaozhen Lu , Xuewu Zhu , Lin Wang , Junyong Zhu","doi":"10.1016/j.memsci.2025.123884","DOIUrl":"10.1016/j.memsci.2025.123884","url":null,"abstract":"<div><div>Positively charged polyamide (PA) nanofiltration (NF) membranes with sub-nanopores show promise for lithium extraction from salt-lake brines with high Mg<sup>2+</sup>/Li<sup>+</sup> ratios. This study introduces the use of triamino guanidine (TG), a highly positively charged molecule, to regulate grafting on monolayer PA membranes, resulting in dual-layer (PEI-TMC-TG) NF membranes. The monolayer PA membranes were created via spin-coating assisted interfacial polymerization between polyethyleneimine (PEI) and tricarbonyl chloride (TMC). The PEI/TMC-TG NF membranes exhibited several advantages over unmodified PEI-TMC NF membranes, including higher positive charge density, narrower pore size distribution, excellent hydrophilicity, and a more porous separation layer microstructure. Experimental results indicated that enhanced Donnan effect, size sieving, and dielectric repulsion within the sub-nanopores contributed to exceptional Li<sup>+</sup>/Mg<sup>2+</sup> selectivity during filtration of East Taijiner brine (S<sub>Li</sub>+<sub>/Mg</sub><sup>2+</sup> = 64.5). Furthermore, the TG hydrophilic layer significantly improved water permeability (15.4 LMH/bar) and long-term stability. To reduce membrane fouling in the charge-positive NF process by removing organic matter from complex salt lake brine, we explored electrocoagulation as a pre-treatment method and identified optimal conditions for the EC-NF process. This strategy maximizes sustainable lithium recovery from brine in an economically viable green manner while enhancing the efficiency of NF membranes for lithium extraction from salt lakes.</div></div>","PeriodicalId":368,"journal":{"name":"Journal of Membrane Science","volume":"722 ","pages":"Article 123884"},"PeriodicalIF":8.4,"publicationDate":"2025-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143463391","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