DESALINATION
·
2024
·
IF 8.3
Peng Zhao,Fei Guo,Lingfeng Wang,Huange Zhen,Ning Zhang,Shaohua Yin,Guoli Zhou,Xuehua Ruan,Gaohong He,Xiaobin Jiang
Nanofiltration membranes with high selectivity and long-term stability for magnesium and lithium ions are crucial to efficiently enriching lithium resources in salt lake brines. Herein, a nano-gradient-structured nanofiltration membrane was fabricated, in which PEI with different molecular weights and TMC were utilized in a gradient interfacial polymerization process to construct the target active layer. Via this facile strategy, the grafting density of PEI and the amino group introduced were properly adjusted, and the pore size distribution and surface charge of the active layer were optimized. The fabricated active layer simultaneously possesses sub-nanometer pore size with a modified gradient structure and high interfacial positive charges, which can accurately screen lithium and magnesium. The successful grafting of secondary PEI and the high positive charge and continuity of the active layer have been demonstrated. After 150 hour operation (Mg/Li ratio of 50), PEI-70000/PA/PES nanofiltration membrane achieved a lithium‑magnesium separation factor (S Li/Mg ) as high as 150 while maintaining the stable permeation flux of approximately 20 L·m −2 ·h −1 ·MPa −1 , and the terminal Mg/Li ratio on the permeable side falls to 0.32, which exhibits significant potential for extracting Li from salt lake brines with high Mg/Li ratio with promising long-term stability.
研究领域:
材料科学
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环境工程
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2022
·
IF 10.53
Shiyu Zhang,Runnan Zhang,Runlai Li,Zixuan Zhang,Yafei Li,Hao Deng,Junhui Zhao,Tianrun Gu,Mengying Long,Xiaoyao Wang,Sui Zhang,Zhongyi Jiang
Positively charged nanofiltration membranes hold great potential in Li + /Mg 2+ separation, but their application in alkaline solutions, such as alkaline salt-lake brines has not been reported. Herein, inspired by the arginine's unique structure and biological function, we explore superstrong basic triaminoguanidine (TG) molecule as aqueous monomer to fabricate positively charged polyamide nanofiltration membranes for Li + /Mg 2+ separation. With the Li + /Mg 2+ mass ratios of 1:50 and 1:120, at pH 9.6, the separation factors (S Li,Mg ) of membranes reach 31.8 and 20.9. Meanwhile, at pH 5.6, the S Li,Mg are 46.4 and 36.4, which are the ever-reported highest value and such high S Li,Mg can be well retained in the pH range of 5.6–8.6. The superior Li + /Mg 2+ selectivity stems from the superhigh protonation capacity of guanidine groups in a broad pH range.
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2023
·
IF 9.5
Huanhuan Wu,Haoyue Zhao,Yakai Lin,Xin Liu,Lin Wang,Hong Yao,Yuanhui Tang,Lixin Yu,Haihui Wang,Xiaolin Wang
Positively charged nanofiltration membrane has gained significant interest in magnesium and lithium separation due to its separation mechanism, especially in salt lake-based lithium industry. To obtain a high-density positive charged surface and high Li + /Mg 2+ selectivity, a novel thin-film nanocomposite (TFN) nanofiltration (NF) membrane for recovery of Li + from Mg/Li mixtures with Mg 2+ /Li + ratios of 20 was successfully prepared by using polymeric amine polyethyleneimine (PEI) and monomeric amine silane coupling agent (3-diamino-methyl-cyclohexyl triethoxysilane, DTES). Then the effect of DTES on the surface properties and performance of the prepared DTES/PEI/TMC TFN membranes were investigated. Chemical composition analysis revealed that DTES not only hydrolyzed to Si–OH and then self-polymerized to Si–O–Si, but also reacted with the self-carrying acyl chloride of 1,3,5-benzene trichloromethane (TMC). Moreover, SiO 2 nanoparticles were in-situ generated from DTES inside the PA layer with high compatibility. Due to the compatible properties with the positively charged PEI polymer, the reacted DTES was distributed uniformly in the formed TFN selective layer with no noticeable aggregation. The doping of SiO 2 into the polyamide network gave rise to the enlargement of the membrane pore size, enhanced the surface hydrophilicity, and reinforced the surface positive charges. The water flux of the DTES/PEI/TMC membrane improved from 36.9 L m −2 h −1 to 49.58 L m −2 h −1 compared to the PEI/TMC membrane. Additionally, the Mg 2+ and Li + rejection of the optimized membranes was 91.46% and −10.5%, respectively, with permeability and selectivity (S Li, Mg = 12.95) superior to that of the commercial NF membranes. Considering the commercial availability of DTES, this study not only offers a high-performance nanofiltration membrane for recovering lithium from brines but also provides a feasible strategy for industrial separation of other monovalent and divalent ions.
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2024
·
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
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2024
·
IF 8.4
Zhiyuan Zha,Tingyu Li,Ismail Hussein,Ying Wang,Song Zhao
The scarcity of lithium can be effectively addressed by extracting it from salt-lake brines. In this work, aza-crown ether (diazo-18-crown-6, DA18C6) was coupled into a polyamide (PA) network interfacial polymerized by trimesoyl chloride and polyethyleneimine (PEI) for efficient Li + /Mg 2+ separation. The embedment of DA18C6 molecule into PA network was confirmed by structural characterization and density functional theory simulation, which enhanced crosslinking degree and reduced average pore size of PA selective layer. In addition, the strong interaction between DA18C6 and Li + was proven through molecular dynamics simulation. The resulting PEI@DA18C6-PA membrane displayed a high pure water permeance of 10.4 L⋅m − 2 ⋅h − 1 ⋅bar − 1 and an excellent Li + /Mg 2+ separation factor ( S Li,Mg ) of 11.2, which was comparable with most reported Li + /Mg 2+ separation membranes . Furthermore, the PEI@DA18C6-PA membrane was employed in a three-stage NF treatment process to filtrate simulated brines containing a high Mg 2+ /Li + ratio of 57. The results demonstrated that Li + can be effectively concentrated and extracted through the membrane to obtain a permeate with an ultralow Mg 2+ /Li + ratio of only 0.03, suggesting that PEI@DA18C6-PA membrane has great application potential in lithium extraction from salt-lake brines.
研究领域:
材料科学
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环境工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2025
·
IF 9.5
Ning Zhang,Yuan Li,Wei Zhang,Yanling Liu,Yongjian Pei,Jie Zhao,Ping Ning,Kai Li
The effective and sustainable separation and recovery of monovalent and divalent metal ions from spent lithium-ion batteries after acid/alkali leaching still remains a big challenge to hydrometallurgical technologies. In this work, we prepared a novel crown ether-ionic liquid functionalized membrane for the selective separation of mono/divalent ions using electrodialysis (ED). a novel membrane was designed by incorporating 15-crown ether-5 (15C5), a crown ether with specific recognition for alkali metal ions, through combining interfacial polymerization and self-assembly techniques into the tunable ionic liquid 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide ([C4mim][NTf2]). The resultant hybrid coating forms a channel structure for the selective transport of monovalent ions. Systematic characterisations on membrane structure, physicochemical properties, and electrochemical performance were performed before and after modification. The ion transport mechanism was performed using ion diffusion mathematical modeling and density functional theory. The designed crown ether ionic liquid functionalized modified membrane 15C5-IL(2)/Cu-MPD showed excellent selectivity for various monovalent/divalent ion pairs of Li+/Mg2+, Na+/Mg2+, and K+/Mg2+ with the values of 5.33, 5.45, and 13.39, respectively. Besides, the membrane was pH-responsive, and it showed a selectivity of Li⁺/Mg²⁺ at 10.45 in the case of pH 7.5. This may be due to the synergistic effect of pore size screening brought about by the distribution of modified components and specific interactions, for instance 15C5/O--Li+. This simple approach opens a new avenue in the quest for selective IEMs for separations of certain cations by ED.
研究领域:
材料科学
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环境工程
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
ChemSusChem
·
2024
·
IF 7.5
Yanan Dong,Ju Bai,Luqi Xiao,Shangqing Chen,Lu Bai,Huaigang Cheng,Linglong Shan,Junfeng Wang,Yi Nie
Graphical Polyethyleneimine (PEI)-templated ZIF-8 (PEI-ZIF-8) was synthesized and incorporated into the PEI aqueous solution, then interfacial polymerized with trimesoyl chloride (TMC) to obtain the PEI-ZIF-8 modified polyamide NF membrane. The optimal PEI-ZIF-8-TMC membrane exhibits a permeance of 9 L/h m 2 bar and a Mg 2+ /Li + separation factor (SF) of 19. MOFs-modified nanofiltration (NF) membranes have been gained a lot of attention due to their favorable permeability and ion separation performance. Nevertheless, the prevailing preparation techniques are afflicted by the incompatibility of MOFs with polymers and the facile loss of MOFs. In this work, polyethyleneimine (PEI)-templated ZIF-8 (PEI-ZIF-8) was synthesized and incorporated into the PEI aqueous solution, then interfacial polymerized with trimesoyl chloride (TMC) to obtain the PEI-ZIF-8 modified polyamide NF membrane. This PEI modified strategy could endow the ZIF-8 nanoparticles with positively charged properties to avoid the aggregation and increase the interfacial compatibility with the polyamide. Meanwhile, the appropriate pore size of ZIF-8 (3.4 Å), which is between the hydration sheath surrounding of Li + (2 Å) and Mg 2+ (4.2 Å) impart the membrane with precise Mg 2+ /Li + separation ability. The optimal PEI-ZIF-8-TMC membrane exhibits a permeance of 9 L/h m 2 bar and a Mg 2+ /Li + separation factor (SF) of 19, both of which surpass the performance of the pure PEI-TMC membrane, which has a permeance of 4 L/h m 2 bar and a Mg 2+ /Li + separation factor of 11. Meanwhile, the membrane exhibited excellent long-term stability of 85 h. This novel approach to preparing MOFs-modified NF membrane represents a promising avenue for the separation of lithium and magnesium.
研究领域:
材料科学
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分离技术
·
纳米科技
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2025
·
IF 19
Linlong Zhou,Shuyun Gu,Siyao Li,Zhi Xu
Membrane separation technology holds large potential for sustainable lithium extraction from salt lakes. Accurate lithium and magnesium separation is determinative of the lithium extraction efficiency. However, it still poses a huge hurdle for conventional nanofiltration membranes to break through the limited permeance and poor Mg 2+ /Li + selectivity. Here, a new monomer cyclodextrin-pentaethylenehexamine (CD-PEHA) containing CD cavity as knot and long amino chains as thread is synthesized as a building block to fabricate CD-embedded polyamide nanofilms via interfacial polymerization. The protonated amino groups along the thread and the annular shape of CD cavity intensify the free volume and electropositivity of the CD-embedded membrane simultaneously, which is favorable for Mg 2+ /Li + separation. The optimum CD-embedded membranes feature a remarkable Mg 2+ /Li + separation selectivity of 51.8 and a high permeance of 10.8 L m −2 h −1 bar −1 , which is preferable than most of the state-of-the-art membranes for lithium extraction. In addition, high-purity Li 2 CO 3 product is obtained via a three-stage nanofiltration process from simulated salt-lake brine. This tailored molecular weaving strategy may herald a promising outlook for the development of advanced membranes for lithium extraction.
研究领域:
材料科学
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环境工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POLYMER RESEARCH
·
2024
·Vol. 32
·期 1
·1-10
·
IF 2.6
Gu Kaifeng,Fang Chuanjie,Wang Jianyu,Zhu Liping
Nanofiltration (NF) is one of the most promising separation technologies of this century. It plays a major role in the chemical, medical, food, and other fields. The separation and permeation performance of NF membranes is closely related to microstructure. In this study, aqueous phase amine monomers are pre-crosslinked during the preparation of NF membranes. Trimesic acid (TMA) is used as a cross-linking agent with polyethyleneimine (PEI), whereby the resulting aqueous-phase monomer is interfacially polymerized with the organic-phase monomer to form a separation layer with internal lithium-ion permeation channels. The physicochemical structure of nanofiltration membranes is analyzed in detail. The pre-crosslinking process is optimized and the NF membrane performance can achieve 97% rejection of MgCl 2 , 15% rejection of LiCl, and 34 L m −2 h −1 permeate flux. The resulting NF membranes also show stable desalination performance in tests with mixed salt solutions. This study provides a new nanofiltration membrane structure and performance optimization scheme, which is favorable for magnesium-lithium separation systems.
研究领域:
化学工程
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材料科学
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环境工程
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Yanli Zhao,Ziqi Cao,Yanxiang Liang,Zhichen Liang,Keyin Ling,Feiyan Zhou,Changsheng Guo,Yao Qian,Pengbi Liu,Xi Liu,Chunguang Wang,Mengchen Zhang,Qinglei Zhang
Membrane consisting of high-throughput aligned ion channels has been pursued for precise Li + /Mg 2+ separation. Herein, an aligned amino-functionalized γ-cyclodextrin nanofiltration membrane was fabricated via a customized interfacial polymerization technique, where the orientation of cyclodextrin ion channels was elaborately tailored by controlling the reaction conditions. The as-fabricated membrane featured ultra-thin selective layer of ∼ 26 nm, average pore size of ∼ 0.72 nm, and ultra-stable positive surface charges. In particular, the aligned intrinsic cyclodextrin cavities in the membrane offered vertical shortcuts for preferential Li + transport. Taking advantage of these, superior membrane permselectivity was achieved with the water permeance of 6.5 L·m −2 ·h −1 ·bar −1 and the Li + /Mg 2+ separation factor up to 22.5, highlighting the great potentials in lithium extraction and other ion separations. Given its simplicity and generality, this customized interfacial polymerization strategy holds great promise for manipulating aligned transport channels in thin film composite membranes, thereby enhancing their performance in a wide range of applications including, but not limited to, desalination, water purification, resource extraction, and energy conversion.
研究领域:
材料科学
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化学工程
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Hongfei Jia,Yangchen Wang,Lizi Yang,Ran Fang
Lithium metal, a pivotal element in modern electric vehicles and electronics, necessitates secure and sustainable supply chains. Extracting lithium from brines presents significant challenges, particularly when dealing with high magnesium-to-lithium ratios, due to the nearly identical ionic radii of lithium and magnesium ions. Herein, we propose an innovative strategy for the selective separation of Li + /Mg 2+ by integrating ZIF-8-NH 2 into polyamide membranes through the interfacial polymerization (IP) of polyethyleneimine (PEI) and trimesoyl chloride (TMC). The synthesized PEI@ZIF-8-NH 2 + TMC membranes exhibit an impressive permeation rate for Li + of 0.863 mol m -2 h -1 , alongside a Li + /Mg 2+ selectivity ratio of 33.06. The unique pore structure of ZIF-8-NH 2 and surface chemistry facilitate efficient Li + /Mg 2+ separation, driven by synergistic interactions such as elevated positive surface charges, subnanometer channels, and strong π-π stacking with polyamide layers. These developments are anticipated to augment both the selectivity and durability of MOF-based membranes, providing new directions for research and practical implementations in ion separation technology.
研究领域:
材料科学
·
环境工程
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2017
·
IF 3.359
Wei Li,Chang Shi,Ayang Zhou,Xiao He,Yawei Sun,Jinli Zhang
For efficient recovery of lithium from brines, a composite nanofiltration (NF) membrane with positively charged skin layer (PA-B) was first synthesized via interfacial polymerization between branched poly(ethylene imine) (BPEI) and trimesoyl chloride (TMC) on the support of crosslinked polyetherimide, and the separation performance was assessed for simulative brine of mixed LiCl/MgCl 2 solution. To improve the permselectivity of Li + against Mg 2+ , then we adopted EDTA to modify the as-prepared positively charged PA-B NF membrane. The optimal EDTA modified NF membrane PA-B2-E3 showed the separation factor S Li , Mg about 9.2 for the LiCl/MgCl 2 mixed solution with a Mg 2+ /Li + mass ratio of 24, with excellent stability within 36 h filtration, which would have promising applications in the recovery of Li from brine.
研究领域:
材料科学
·
环境工程
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）