Separations
·
2022
·Vol. 9
·期 7
·180
·
IF 3.344
Lei Ma,Qiuyan Bi,Yuanhui Tang,Chao Zhang,Fuju Qi,Hao Zhang,Yifan Gao,Shiai Xu
In order to recover lithium from brine with a high Mg2+/Li+ratio, a positively charged nanofiltration (NF) membrane was prepared by depositing polydopamine (PDA)-coated graphitic carbon nitride (g-C3N4) as the interlayer (PDA-g-C3N4) and the interfacial polymerization (IP) of polyethyleneimine (PEI) and trimesoyl chloride (TMC) was carried out. Under optimal conditions, the water contact angle of the composite membrane is only 55.5° and the isoelectric point (IEP) is 6.01. The final positively charged NF membrane (M5) exhibits high permeance (10.19 L·m−2·h−1·bar−1) and high rejection of Mg2+(98.20%) but low rejection of Li+(13.33%). The separation factor (SF) is up to 48.08, and the Mg2+/Li+ratio of the permeate is 0.036 in the simulated brine. In conclusion, the M5 membrane shows a good separation performance for salt lake brine (SF = 12.79 and Mg2+/Li+ratio of the permeate = 1.43) and good fouling resistance. Therefore, the positively charged M5 membrane with PDA-g-C3N4as the interlayer has the potential to be used for the recovery of lithium from brine.Keywords:polydopamine;graphitic carbon nitride;nanofiltration membrane;brine;Mg2+/Li+separation
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
Nanomaterials
·
2023
·Vol. 13
·期 20
·2777
·
IF 5.3
Zhenhua Feng,Chengwen Liu,Binbin Tang,Xiaojun Yang,Wenjie Jiang,Peng Wang,Xianjun Tang,Hongshan Wang,Xiangdong Zeng,Guangyong Zeng
Graphene oxide (GO) two-dimensional (2D) membranes with unique layer structures and tunable layer spacing have special advantages and great potential in the field of water treatment. However, GO membranes face the issues of weak anti-swelling ability as well as poor permeability. We prepared GO/Ti3C2TX2D composite membranes with 2D/2D structures by intercalating Ti3C2TXnanosheets with slightly smaller sizes into GO membranes. Ti3C2TXintercalation can effectively expand the layer spacing of GO, thereby substantially enhancing the flux of the composite membrane (2.82 to 6.35 L·m−2·h−1). Moreover, the GO/Ti3C2TXcomposite membrane exhibited a good Mg2+/Li+separation capability. For the simulated brine, the separation factor of M2 was 3.81, and the salt solution flux was as high as 5.26 L·m−2·h−1. Meanwhile, the incorporation of Ti3C2TXnanosheets significantly improved the stability of GO/Ti3C2TXmembranes in different pH environments. This study provides a unique insight into the preparation of highly permeable and ion-selective GO membranes.Keywords:graphene oxide;Ti3C2TXnanosheets;two-dimensional materials membrane;Mg2+/Li+separation
研究领域:
材料科学
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环境工程
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2025
·
IF 9
Zhongbiao Wang,Zhanyun Yang,Xin Shi,Qing Zhang,Wenzhong Ma,Qiuyan Bi,Yakai Lin
Achieving a balance between high water permeability and excellent ion separation performance remains a significant challenge for traditional nanofiltration (NF) membranes due to the inherent trade-off between permeability and selectivity. This study proposes an innovative modification strategy involving dopamine (DA)-functionalized ball-milled graphitic carbon nitride (BM-g-C 3 N 4 ), leading to the successful fabrication of high-performance NF membranes. The ball-milling process significantly improves the dispersibility of g-C 3 N 4 , while DA functionalization enhances the hydrophilicity of the membrane surface and the adhesion to the substrate. The results demonstrate that the incorporation of DA functionalized BM-g-C 3 N 4 (DA@BM-g-C 3 N 4 ) effectively reduces defects in the separation layer and provides additional water transport channels. The modified membrane exhibited outstanding separation performance, with the separation factor (SF) increasing from 13.77 to 22.42 and permeation flux improving from 9.9 L/(m 2 ·h) to 17.54 L/(m 2 ·h), tested in a 2.0 g·L −1 MgCl 2 /LiCl mixed salt solution. Furthermore, the fabricated NF membranes showed excellent ion separation efficiency and long-term operational stability, with the rejection rate of Mg 2+ remaining stable between 92.74 % and 97.78 % after 200 h of continuous operation.
研究领域:
材料科学
·
环境工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2022
·
IF 10.53
Quan Li,Yahui Liu,Yanghe Liu,Yanhong Ji,Zhenyu Cui,Feng Yan,Jianxin Li,Mohammad Younas,Benqiao He
An electric field assisted nanofiltration (ENF) process was used for Mg 2+ /Li + efficient separation from a MgCl 2 /LiCl solution and a simulated salt-lake brine. The influence of membrane pore structure , electric property, and other process parameters on the Mg 2+ /Li + separation performance in the ENF was systematically investigated. The structural coefficient ( λ ) of NF membrane was introduced to quantify the membrane pore structure including pore size, pore length and porosity. Results suggested that membrane pore structure, instead of membrane pore size, had a critical role on the ENF separation performance. Direct current electric field (DC-EF) markedly promoted Mg 2+ /Li + separation. However, the effect of alternating current EF (AC-EF) with different frequencies was nominal. The synergistic effect between λ and DC-EF on Mg 2+ /Li + separation was also demonstrated. A low-concentration feed with suitable Mg 2+ /Li + mass ratio and pH value, and low transmembrane pressure were beneficial to Mg 2+ /Li + separation. For 2000 ppm MgCl 2 /LiCl feed solution with a Mg 2+ /Li + mass ratio of 20, a nearly complete rejection to Mg 2+ and a high Li + flux simultaneously achieved; correspondingly, a separation factor of Li + over Mg 2+ ( S Li,Mg ) reached above 7000, which is 2-3 orders of magnitude higher than that of pure NF membrane. For a simulated 10,000 ppm brine solution, a S Li,Mg value was up to above 50. The study suggested that ENF process witnessed simple and efficient separation performance for Li + extraction from salt lakes.
研究领域:
化学工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2022
·
IF 10.53
Yunhao Li,Shuhao Wang,Wenyuan Wu,Haijun Yu,Ruxin Che,Guodong Kang,Yiming Cao
Nanofiltration is considered a promising technology for separation of multivalent/monovalent ions such as extracting lithium from Salt Lake brine with high Mg 2+ /Li + ratio. However, the nanofiltration membranes fabricated via conventional interfacial polymerization process generally possess negatively charged surface and have low Mg 2+ /Li + selectivity. Herein, we proposed a new and facile method, i.e., reversed interfacial polymerization (RIP), to prepare nanofiltration membranes with positively charged surface and uniform charge distribution. The sequence of amine (polyethyleneimine, PEI) and acyl chloride (trimesoyl chloride, TMC) monomers on polysulfone support was reversed compared to the conventional interfacial polymerization (IP) process. Moreover, the solvent of amine monomer was acetone instead of water. The nanofiltration membranes fabricated by this method exhibited higher water flux (from 4.88 to 22.25 Lm −2 h −1 ) and MgCl 2 rejection (from 84.36% to 97.71%). Meanwhile, LiCl/MgCl 2 separation factor in single salt solution reached up to 13.93, which was almost quadruple compared to the conventional control membrane. In addition, the developed nanofiltration membrane also exhibited an excellent separation selectivity ( S Li, Mg = 9.22) in mixture system (Mg 2+ /Li + mass ratio of 20), which had good application potential in extracting lithium resources from Salt Lake brine.
研究领域:
材料科学
·
环境工程
·
化学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2024
·
IF 8.4
Xuyong Tian,Dawei Ji,Haowei Feng,Weijia Lin,Chunlei Wang,Liying Wei,Wei Shu,Changfa Xiao
In recent years, with the rapid development of new energy vehicles, the demand for lithium resources has been increasing sharply. Positively charged nanofiltration (NF) membranes can accurately separate magnesium ions (Mg 2+ ) and lithium ions (Li + ), which have become an important technology for extracting lithium resources from salt lakes. The introduction of intermediate layer in thin-film composite (TFC) NF membranes could improve the permeability and selectivity for Mg 2+ /Li + separation. However, there is a problem of poor bonding between the intermediate layer and the supporting membranes through the simple physical combination on the membrane surface. Inspired by the controlled growth of succulent plants, the positively charged PA/ZIF-8/PSF composite NF membranes with “multilayer interlocking” structure were prepared successfully based on ZIF-8 layer anchored constrained growth and further interfacial polymerization. The zinc ion ligands of ZIF-8 were pre-anchored on the PSFsolution to provide reaction sites, and the grown ZIF-8 nanoparticles were embedded in the PSFsupporting membrane surface layer. The embedded ZIF-8 nanoparticles can enhance the interface bonding between the PSFsupporting membranes and the ZIF-8 layer. Additionally, the confined growth method can solve the problems of ZIF-8 particle aggregation and poor dispersion. Compared with membranes without ZIF-8 layer, the prepared PA/M − 6 membrane had a high flux of 47.2 L m −2 h −1 , which was 1.82 times that of PA/M-0. Meanwhile, the Mg 2+ /Li + separation factor of the PA/ZIF-8/PSF composite NF membranes could reach 47.6. In particular, the prepared NF membranes exhibited good long-term stability for Mg 2+ /Li + separation.
研究领域:
材料科学
·
环境工程
✓ 已验证
产品关联
DOI
高影响因子
DESALINATION
·
2018
·
IF 6.603
Ping Xu,Wei Wang,Xiaoming Qian,Haibo Wang,Changsheng Guo,Nan Li,Zhiwei Xu,Kunyue Teng,Zhen Wang
To effectively separate Mg 2+ and Li + from salt lake brine with high Mg 2+ /Li + mass ratio, a positive charged nanofiltration membrane with abundant -NH 3 + and -NH 2 + was designed and fabricated via interfacial polymerization between polyethyleneimine (PEI) and trimesoyl chloride (TMC) on the polyethersulfone ultrafiltration membrane. Zeta potential test revealed that at pH below 9.3, the resulting membrane exhibited a high positive charge due to a large amount of unreacted amine groups on the PEI branch. In the separation process, Donnan exclusion effect dominated the separation performance of resulting membranes for Mg 2+ and Li + . The results showed that the Mg 2+ /Li + mass ratio declined from initial 20 to 1.3 and the separation factor S Mg , Li was as low as 0.05 with a pure water permeation of 5.02 L/(m 2 hbar) after filtration with resulting NF membrane. The difference between the rejection for Mg 2+ and Li + reached up to 76%. Compared with membrane in previous studies, the separation performance for Mg 2+ and Li + of positive charged NF membrane prepared in this work increased more than one time. This research demonstrated the potential of positive charged PEI-TMC composite NF membrane for the separation of Mg 2+ and Li + from salt lake brine with high Mg 2+ /Li + mass ratio.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2023
·Vol. 33
·期 51
·2305815
·
IF 19
Huawen Peng,Yafei Su,Xufei Liu,Jiapeng Li,Qiang Zhao
High performance polyamide nanofiltration membranes play important roles in Mg 2+ /Li + separation and Li + extraction, but they are prepared via multiple time-/labor demanding steps. Both the scalability of these membranes and the engineering of membrane modules remain an elusive challenge. Here the design of a Gemini-electrolyte monomer (GEM) featuring bidentate amine groups, quaternary ammonia, and endocyclic contorted conformation is reported. The monomer's low interfacial diffusivity is balanced by high condensational reactivity during its interfacial polymerization with trimesoyl chloride (TMC), leading to the straightforward formation of defect-free, ≈14 nm thick membranes. The membrane shows the highest permeance (≈19.2 L m −2 h −1 bar −1 ) among Mg 2+ /Li + nanofiltration membranes prepared via straightforward interfacial polymerization without post-modification, combined with good Mg 2+ /Li + selectivity (≈15.4) and stability. The validity of GEM design is verified by control monomers. Large-area (1 × 2 m 2 ) GEM-TMC membranes and spiral-wound modules (effective area: 0.5 m 2 ) are prepared, both of which show reproducible and high performance.
研究领域:
材料科学
·
化学工程
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
DESALINATION
·
2024
·
IF 8.3
Jia-Min Jin,Hao Ye,Tian-Hao Li,Ming-Bang Wu,Lin Liu,Juming Yao
Positively charged and non-toxic intermediate layers are highly desirable for the construction of nanofiltration membranes in the field of Mg 2+ /Li + separation. Herein, we have prepared dual-electric layer nanofiltration membranes via introducing positively charged quaternized cellulose nanocrystals (Q-CNC) beyond the negatively charged polyamide skin layers. On the one hand, the strong interactions between Q-CNC and piperazine (PIP) could regulate the thickness, roughness, and residual groups of the polyamide (PA) layers, resulting in improved water flux. On the other hand, the Q-CNC has lots of positive charges which are beneficial for enhancing the rejections of negatively charged polyamide skin layers towards divalent cations since the Donnan and electrostatic effects are long-range forces. Moreover, this effect could be amplified by reducing the thickness of skin layers or decreasing the contents of residual carboxyl groups via adjusting the monomer concentrations. The obtained nanofiltration membranes possess high water flux of 51 L/m 2 /h/bar, and rejection for MgCl 2 of 86 %. The separation factor of Mg 2+ /Li + is 29 when the Mg 2+ /Li + mass ratio in the feed solution is 20:1. Moreover, the nanofiltration membrane with Q-CNC intermediate layers (QNFM) has good antibacterial properties, showing great potential in the fields of lithium extraction from salt lakes.
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
·
2023
·
IF 8.6
Hongshan Wang,Guangyong Zeng,Zhaomei Yang,Xi Chen,Ludan Wang,Yuan Xiang,Xiangdong Zeng,Zhenhua Feng,Binbin Tang,Xudong Yu,Ying Zeng
With the consumption of lithium resources increasing year by year, the investigation of high-performance salt lake lithium extraction technology is extremely important. In order to effectively separate Mg 2+ and Li + from brine, a novel charge-positive nanofiltration (NF) membrane with high permeability and excellent Mg 2+ /Li + separation factor was designed by interfacial polymerization (IP) in this work. A B15C5-MX-NF membrane was fabricated by blending hydrophilic two-dimensional (2D) MXene nanosheets into a PES membrane substrate to enhance the permeability, followed by the modification of polyamide (PA) layer with a crown ether molecule (Benzo-15-crown-5) to optimize the surface properties of membrane. The PA layer thickness was effectively reduced (58 nm) due to the enhancement in the interaction between the substrate membrane and PEI by the incorporation of MXene, while the addition of B15C5 provided additional Li + permeation channels. The B15C5-MX-NF membrane exhibited excellent permeability (16.1 L·m −2 ·h −1 ·bar −1 ) and superior selectivity for Mg 2+ /Li + ( S Li, Mg of 15.8) under the dual optimization of membrane substrate and PA layer. In addition, it was demonstrated by molecular dynamics (MD) simulations that the B15C5 molecules in the B15C5-MX-NF membranes had a specific recognition ability of Li + to allow its preferential permeation, thereby enhancing the Mg 2+ /Li + selectivity of the membranes. This study provides a new idea for the preparation of NF membranes for efficient Mg 2+ /Li + separation.
研究领域:
材料科学
·
化学工程
·
膜技术
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2023
·
IF 9.5
Kuo Chen,Feiyang Li,Tao Wei,Hengyu Zhou,Tengfang Zhang,Shengchao Zhao,Tengteng Xie,Haixiang Sun,Peng Li,Q. Jason Niu
The Mg 2+ /Li + screening selectivity determines the practical application of nanofiltration technology in lithium extraction from salt-lake brines and industrial lithium production. In this work, a membrane structure design strategy based on the interlayers was developed to prepare nanofiltration (NF) membranes with high Mg 2+ /Li + separation selectivity and high permeability. Through investigating the influence of the interlayer charge on the structure and performance of the NF membrane, the interlayer for the preparation of the NF membrane with high Mg 2+ /Li + separation selectivity was screened. Relevant characterizations indicate that the positively charged interlayer can endow the NF membrane with appropriate pore size and surface charge density to achieve high Mg 2+ /Li + separation selectivity through the synergistic effect of size sieving and Donnan exclusion. Moreover, the pore size of the NF membrane is controlled by the release rate of the piperazine (PIP) from the interlayer, while the surface charge density of the NF membrane is jointly determined by the charge of the interlayer and PA layer. The performance evaluation suggests that the NF membrane prepared with the best screened interlayer has a Mg 2+ /Li + separation factor up to 88.6 while maintaining a high permeability (22.5 L m −2 h −1 ·bar −1 ), which is better than that of the most membranes reported in the literature. Overall, this work is expected to promote the practical application of NF membranes in lithium extraction from salt-lake brines and industrial lithium production.
研究领域:
材料科学
·
环境工程
·
化学工程
·
膜技术
✓ 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）