JOURNAL OF MEMBRANE SCIENCE
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2024
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IF 8.4
Yanna Wu,Mengmeng Jia,Shuming Li,Zong Lu,Yanying Wei,Haihui Wang
Lithium extraction from salt lake is important for carbon neutrality, while obtaining both high Li + /Mg 2+ selectivity and high water permeance is still challenging. The burgeoning two-dimensional (2D) material membranes in decade show enormous potential to solve above problem due to its highly designable lamellar structure. In this work, a kind of positively charged laminated membranes using MXene nanosheets as building blocks with decoration of poly (diallyl dimethyl ammonium chloride) (PDDA) were proposed. Benefiting from the well–intercalated PDDA between MXene nanosheets, the interlayer spacing between neighboring nanosheets was greater than 2 nm, which was conductive to enhance water permeance. Simultaneously, the introduction of PDDA endowed the membrane with positive charge, which exhibited sharply improved Li + /Mg 2+ selectivity by an order of magnitude due to enhanced Donnan effect. The prepared MXene/PDDA membrane with a modification mass ratio of 1:10 exhibited high Li + /Mg 2+ selectivity of 29.3 with MgCl 2 saline solution permeance of 9.8 L m −2 h −1 ·bar −1 and pure water permeance of 32.3 L m −2 h −1 ·bar −1 , which was promising for lithium extraction. Such membrane constructing concept could be expanded to other kinds of membranes based on 2D nanosheets for effective ion sieving.
研究领域:
材料科学
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环境科学
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DOI
高影响因子
ACS Applied Materials & Interfaces
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2023
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IF 9.5
He Zhang,Yuping Du,Dengwei Jing,Liu Yang,Junyi Ji,Xiaoke Li
Solar-driven interfacial evaporation (SIE) technology has great advantages in seawater desalination. However, during the long-term operation of a solar evaporator, salts can be deposited on the solar absorbing surface, which, in turn, hinders the evaporation process. Therefore, there is an urgent need to propose new antisalt strategies to solve this problem. Here, we present a novel cogeneration system leveraging a salt-tolerant, heterogeneous Janus-structured evaporator (FHJE) for simultaneous solar desalination and thermoelectric generation. The top evaporation layer is composed of a graphene-based photothermal membrane pre-embedded with Fe3+ cations, which enhanced solar absorption and energy conversion abilities. Meanwhile, the Fe3+ cations further contribute to the Donnan effect, effectively repelling salt ions in saltwater. The bottom layer comprises a hydrogel composed of hydrophilic phytic acid (PA) and poly(vinyl alcohol) (PVA), fostering facilitation of water transport. The FHJE was demonstrated to exhibit evaporation rate and efficiency as high as 3.655 kg m–2 h–1 and 94.7% in 10 wt% saltwater, respectively, and superior salt resistance ability without salt accumulation after 8 h of continuous evaporation (15 wt%). Furthermore, a hydropower cogeneration evaporator device was constructed, and it possesses an open-circuit voltage (VOC) and a maximum output power density of up to 143 mV and 1.33 W m–2 under 1 sun, respectively. This study is expected to provide new ideas for comprehensive utilization of solar energy.
研究领域:
能源材料科学
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环境工程
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可再生能源技术
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DOI
PubMed
高影响因子
JOURNAL OF MEMBRANE SCIENCE
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2021
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IF 8.742
Ming-Bang Wu,Hao Ye,Zhi-Yuan Zhu,Guo-Tao Chen,Lu-Lin Ma,Shi-Cheng Liu,Lin Liu,Juming Yao,Zhi-Kang Xu
Nanofiltration (NF) shows great application potentials in selectively recovering lithium (Li) from natural brine to meet the rapidly growing demands in lithium-ion batteries. However, it remains challenges in how to fabricate positively-charged NF membranes via a convenient method since conventional polyamide-based NF membranes are negatively-charged, which exhibit undesirable Mg 2+ /Li + selectivity according to the Donnan and electrostatic effects. Herein, we report a new kind of interfacial polymerization (IP) for preparing positively-charged NF membranes at the gas/liquid (GL) interface by replacing the amine solution with amine gas. Compared with the traditional liquid/liquid interfacial polymerization (LLIP), the amine monomers are always more abundant than the acyl chloride monomers during the GLIP process. Therefore, enough amino groups are desirably remained, resulting in positively-charged polyamide-based layers. In addition, the surface charges as well as the average pore sizes of the polyamide-based layers can be facilely adjusted by the reaction time due to the slow reaction kinetics in the GLIP process. The as-prepared NF membranes show a relatively high rejection for MgCl 2 of 98.5% and low rejection for LiCl of 22.6%, demonstrating their excellent Mg 2+ /Li + selectivity. Moreover, the NF membranes can also maintain the high Mg 2+ /Li + separation factors as high as 28 during a long-term operation.
研究领域:
材料科学
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环境工程
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DOI
高影响因子
DESALINATION
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2017
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IF 5.527
Haoqin Zhang,Rui Ding,Yujing Zhang,Benbing Shi,Jingtao Wang,Jindun Liu
Herein, a novel thin electronegative layer with loosely porous structure is fabricated through interfacial polymerization of benzene-rich monomer (2,5-diaminobenzenesulfonic acid (DSA) or 3,5-diaminobenzoic acid (DMA)) and cross-linker (trimesoyl chloride), using the blend of polyvinyl alcohol and quaternized-chitosan as base membrane. The base membrane achieves adequate fluxes for both monovalent and divalent anions but limits monovalent/divalent anions permselectivity to below 2.5. By comparison, the thin and porous surface layer endows the dual-layered membrane with only slight flux reduction of below 9.0% for monovalent anions, yet a 30.6% flux reduction for SO 4 2 − based on Donnan-effect and steric effect . The effective intercept of SO 4 2 − on membrane surface weakens its competitive transfer with Cl − , thus the Cl − /SO 4 2 − permselectivity is significantly elevated by 472.2% from 1.8 to 10.3, which is even 36.3% higher than that of commercial Neosepta ACS. Furthermore, the antifouling potential and thermal/mechanical stabilities of the dual-layered membrane are improved assisted by the hydrophilic and electronegative features of coated layer and its covalent bonds with base layer. DSA and DMA, two analogous monomers, are utilized and compared to verify the universality of this nanostructure , helping to explore the structure-performance relationship.
研究领域:
材料科学
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膜技术
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化学工程
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DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
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2025
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IF 9
Wenyan Ji,Yuping Li,Feng Duan,Lulu Liu,Renqiang Cao,Jingya Yin,He Sun,Jianquan Luo,Hongbin Cao
Nanofiltration membranes are essential for lithium recovery from brine, but their selectivity declines under high-salt conditions due to electrostatic shielding and fouling. We introduce a novel strategy to enhance membrane performance by enhancing positive charge density on the membrane surface while creating negative charge microdomains within the membrane. Specifically, we functionalized a polyethyleneimine-based membrane with 1,4-butanesultone through a ring-opening reaction, which balanced ion-membrane affinity and optimized the transport kinetics of water and ions. The resulting membrane exhibited a significant enhancement in permeance up to 11.2 L m −2 h −1 bar −1 and selectivity for Mg 2+ /Li + up to 51. Notably, it maintained over 96.21 % MgCl 2 rejection across a wide salt concentration range of 1–20 g L −1 , outperforming the results reported in literature. The comprehensive testing and mechanistic study indicate that this improved performance is due to the synergy of Donnan effect and ion-attraction, facilitated by the designed charge distribution. A two-stage nanofiltration process employing this membrane reduced the Mg 2+ /Li + ratio in brine samples from 43 to 0.25, highlighting its practical application potential. This work introduces a new paradigm for the design of highly selective membranes.
研究领域:
材料科学
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环境工程
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2021
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IF 13.273
Shuting Xu,Haibo Lin,Guiliang Li,Jianqiang Wang,Qiu Han,Fu Liu
Ions sieving is significant but challengeable for seawater desalination, industrial water treatment and salts recovery. Traditional nanofiltration (NF) membranes suffer from undesirable ion selectivity and permeance due to uncontrolled aromatic polyamide (PA) nanofilm. Herein, we first reported an anionic covalent organic framework (TpPa-SO 3 Na) with abundant sulfonic acid groups as a mediating interlayer to fabricate PA composite membrane. The uniform and negatively charged TpPa-SO 3 Na spherical nanoparticles were in situ soldering on nylon substrate by liquid–liquid interfacial Schiff reaction. The TpPa-SO 3 Na interlayer assisted in creating a defect-free PA nanofilm through mediating the diffusion–reaction process of amine monomers. According to enhanced Donnan effect, the composite polyamide nanofiltration membrane showed an outstanding salt rejection ratio (Na 2 SO 4 , 99.6%), high single salt selectivity (NaCl/Na 2 SO 4 , 178.5) and mono/divalent anion selectivity (Cl − /SO 4 2− , 312.6), superior to most reported NF membranes. This work shed light on strategies to synthesize emerging covalent organic framework materials and to effectively construct NF composite membranes with excellent solute retention and ions sieving capabilities.
研究领域:
材料科学
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环境工程
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化学工程
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产品关联
DOI
高影响因子
DESALINATION
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2025
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IF 9.8
Xu Wu,Hao Xie,Kaiting Zhang,Ruiqi Zheng,Xin Yu,Ranwen Ou
Active layered modification of thin-film composite (TFC) nanofiltration·(NF) membranes has enhanced the rejection performance of emerging micropollutants (EMPs) in water treatment applications. However, the influence of surface charge density on the NF membrane has been overlooked when evaluating the efficacy of tailoring membrane performance. In this study, five distinct membranes of NF-PEI 1 , NF-PEI 2 , pristine NF, NF-SA, and NF-PSS with continuously tuned charge intensity from positive, neutral to negative were fabricated by introducing polyelectrolytes into the active layer. The addition of polyelectrolytes slightly decreased the pore size of membranes while increasing the water flux. In general, the modified membranes with positive and negative charges exhibited an increase of rejection from 66–85 % to 75–97 % for a variety of EMPs and 5–17 % to 7–44 % for salts, with the rejection improving as the surface charge intensity of NF-X membranes increased. Notably, the selectivity of charged EMPs and salts improved significantly from 5 to 11 of NF membrane to 12–32 of NF-PEI 1 and NF-PSS membranes, while the selectivity of neutral EMP and salts remained unchanged. That demonstrated the significant role of Donnan interaction in enhancing the rejection of EMPs and the selectivity of EMPs/salts. The NF-X membranes were promising for separating EMPs and salts in applications such as textile wastewater treatment, antibiotic purification, and aquiculture seawater treatment. This study provided valuable insights into the separation mechanism of NF membranes with charged active layers for removing emerging pollutants, highlighting the synergistic interplay of the Donnan effect and size exclusion for efficient treatment of emerging pollutants.
研究领域:
环境科学
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材料科学
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水处理技术
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产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
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2025
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IF 9
Peng Song,Yi Zhang,Hongyan Du,Quan Wang,Quan-Fu An
Hydrocarbon proton exchange membranes (PEMs) have been extensively employed in redox flow batteries (RFBs) due to their environmental benefits and ion selectivity towards redox species. However, high cost of polymer monomers and complex synthesis processes continue to hinder the widespread adoption of such PEMs in RFBs. In this work, a series of sulfonated polybenzimidazole membranes (SNPBI-x) are simply designed through direct sulfonation and the corresponding application in iron-chromium redox flow battery (ICRFB) has been verified. The SNPBI-x membrane is composed of rigid polybenzimidazole and naphthalene rings, which not only mitigate the reduction in mechanical properties caused by sulfonic acid groups but also ensure the chemical stability of the membrane during operation. Also, SNPBI-x membrane exhibits relatively high ion exchange capacity (IEC), high water uptake and low swelling ratio compared to Nafion 212. Meanwhile, the permeability of SNPBI-1.42 is notably low, with values of only 0.762 × 10 −7 cm s −1 for Fe 3+ and 0.438 × 10 −7 cm s −1 for Cr³⁺ over 96 h. The high ion selectivity is attributed to the Donnan effect introduced by the protonation of imidazole groups, which enhances the ion barrier properties of the membrane and battery performance. Moreover, optimized SNPBI-1.42 demonstrates the best battery performance among all the membranes tested, achieving a coulombic efficiency (CE) of 97.55 %, an energy efficiency (EE) of 86.88 % and a voltage efficiency (VE) of 89.06 % at 100 mA cm −2 . Furthermore, SNPBI-1.42 maintains an EE of over 80 % for more than 1600 cycles in ICRFB, further confirming its superior chemical stability in ICRFB.
研究领域:
材料科学
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能源存储技术
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）