WATER RESEARCH
·
2025
·
IF 12.4
Xiangmin Xu,Xiaowei Zhu,Jinchao Chen,Xingran Zhang,Zhiwei Wang,Fang Li
Ion selective membranes with precise Mg 2+ /Li + separation have attracted extensive interest in lithium extraction to circumvent the lithium supply shortage. However, realizing this target remains a significant challenge mainly due to a high concentration ratio of Mg 2+ /Li + as well as the relatively close ionic hydration radius and chemical. Herein, inspired by the host-guest recognition between alkali-metal ions and crown ether (CE), a novel approach was proposed to regulate the membrane internal structure by introducing CE to strengthen the complexation between Li + and CE. The CE modified membranes achieved the unique outcome of “Li + rejection-Mg 2+ permeation” deriving from enhanced solubility ( K S ) and retarded diffusivity ( D S ) of Li + compared to that of Mg 2+ . The Mg 2+ /Li + separation factors for MgSO 4 /Li 2 SO 4 and MgCl 2 /LiCl of modified membranes ( i.e., 20.1 and 17.7) are about 21.9 and 19.9 time higher than that of pristine membranes, respectively. The results from density function theory (DFT) indicated that the stronger host-guest interaction between CE and Li + combined them closely, thereby increasing solubility and reducing diffusivity of Li + . Our findings develop a new efficient membrane-based strategy enabling the production of high-purity lithium salts from simulated brine.
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MATERIALS LETTERS
·
2023
·
IF 3
Xi Chen,Hulin Zhang,Mengqiang Wu,Haoran Lai,Xiang Zhang,Yao Li
Electrochromic(EC) device offer a viable and efficient solution for optimizing building energy consumption, as they possess the ability to actively regulate the transmission of solar energy and visible light through voltage control. In this study, we endeavor to construct and investigate quasi-solid-state EC devices utilizing Mg 2+ electrolytes. The MgCl 2 /PEG solid-state electrolyte is deposited through knife coating and applied in EC devices. The devices exhibit the ΔT exceeding 35% across a wavelength range of 540 to 1100 nm, with a maximum value of 44% at 660 nm. Additionally, the devices demonstrate the swift switching times and a high coloration efficiency. This work not only confirms the potential of MgCl 2 /PEG electrolytes as promising candidates for next-generation EC devices but also opens up new avenues for the preparation of high-performance quasi-solid-state EC smart windows.
研究领域:
材料科学
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电化学
·
智能窗
·
节能建筑
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Shuxin Zhang,Wen Ren,Yanna NuLi,Baofeng Wang,Jun Yang,Jiulin Wang
Magnesium-sulfur (Mg-S) batteries are an alternative electrochemical energy-storage system with higher safety as well as large theoretical volumetric energy density than lithium-sulfur (Li-S) batteries. Herein, we further research sulfurized-pyrolyzed polyacrylonitrile (S@pPAN) composite containing 47.3 wt% sulfur as cathode of Mg-S batteries with nucleophilic (PhMgCl) 2 -AlCl 3 + LiCl/THF electrolyte. Except a significant restraint of the reaction between the nucleophilic electrolyte and the electrophilic sulfur, polysulfide dissolution and shuttle are effectively suppressed. Electrochemical performance is further enhanced using MBA-(MgCl 2 ) 2 -(AlCl 3 ) 2 + LiCl/THF non-nucleophilic electrolyte with 677.9 mAh g −1 specific capacity and 75.9% cycling stability after 85 cycles at 0.1C. More effective CEI layers formed on the cathode with a lower electrode/electrolyte internal resistance play a key effect on the enhanced electrochemical performance. This work will attract extensive study on Mg-S batteries containing easily prepared electrolytes with a combination of S@pPAN cathode.
研究领域:
电化学
·
储能材料
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电池技术
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材料科学
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Membranes
·
2021
·Vol. 12
·期 1
·57
·
IF 4.106
Huan Liu,Quan Li,Benqiao He,Zhengguang Sun,Feng Yan,Zhenyu Cui,Jianxin Li
The efficient separation of Sr2+/Mg2+through nanofiltration (NF) technology is a great challenge because Sr2+and Mg2+ions are congeners with the same valence and chemical properties. In this work, an NF membrane under an electric field (EF) was successfully employed to separate Mg2+and Sr2+ions for the first time. The effects of current densities, Mg2+/Sr2+mass ratios, pH of the feed, and coexisting cations on separation performance were investigated. Dehydration of Sr2+or Mg2+ions under EF was proved by molecular dynamics simulation. The results showed that a high-efficient separation of Mg2+/Sr2+was achieved: Mg2+removal of above 99% and increase in Sr2+permeation with increasing EF. A separation factor reached 928 under optimal conditions, far higher than that without EF. The efficient separation of Mg2+/Sr2+ions was mainly due to rejection of most Mg2+ions by NF membrane and in situ precipitation of partly permeated Mg2+ions by OH−generated on the cathode under EF. Meanwhile, preferential dehydration of Sr2+ions under EF due to lower hydration energy of Sr2+compared with Mg2+resulted in an increase of permeation of Sr2+ions. This work provided a new idea for separation of congener ions with similar valence and chemical properties.Keywords:ENF process;congener ions;dehydration;efficient separation
研究领域:
环境科学
·
化学工程
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高影响因子
DESALINATION
·
2022
·
IF 11.211
Yang Xu,Huawen Peng,Hao Luo,Qi Zhang,Zhitian Liu,Qiang Zhao
The separation of lithium (Li + , 3.8 Å) and magnesium (Mg 2+ , 4.3 Å) ions represents the main challenge for lithium extraction from salt lakes with high magnesium-to‑lithium (Mg 2+ /Li + ) ratio. A bis -quaternary ammonium salt (abbreviated as QEDTP) was designed to modify Polyethyleneimine (PEI) polyamide nanofiltration membrane. Water flux of the modified PEI membrane is 126.9 ± 1.6 L·m −2 ·h −1 (LMH) under 6 bar hydraulic pressure , which is 4.4 times as high as the pristine PEI membrane (25.8 ± 0.3 LMH). Meanwhile, the MgCl 2 rejections of both membranes are maintained >95%. Nanofiltration performance of the QEDTP membrane is stable in 180 h continuous nanofiltration test at 6 bar pressure. The water flux and Mg 2+ /Li + selectivity ( S Mg2+/Li+ ) of the QEDTP modified membrane in filtrating 2000 ppm Mg 2+ /Li + mixture (Mg 2+ /Li + ratio: 120:1, 6 bar) are 112.9 ± 1.6 LMH and 15.6 ± 0.3, which is one of the best Mg 2+ /Li + separation performance considering both the flux and selectivity.
研究领域:
材料科学
·
化学工程
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Yunhao Li,Shuhao Wang,HengYu Li,Dandan Liu,Yan Jin,Guodong Kang,Yiming Cao
Lithium extraction from salt-lake brine with a high Mg 2+ /Li + ratio is crucial for mitigating lithium supply shortage. Positively charged polyamide nanofiltration membranes, which are often prepared by performing interfacial polymerization (IP) using polyethyleneimine and trimesoyl chloride, are considered to be promising candidates for Mg 2+ /Li + separation owing to their high energy efficiency and low environmental impact. However, the performance of these membranes is severely hindered by “useless pores” and “defects” present in the flexible polyamide layer. Herein, we provide a facile strategy for modifying flexible semi-aromatic polyamide chains by intercalating a rigid electropositive monomer, histamine, to remold the internal pores and positive charge density at a molecular level. Two routes, namely, “swelling-embedding-reacting-shrinking (SERS)” and “in-situ interposition (SIP)” were used to construct a new polyamide layer with rigid–flexible microstructures. The fabricated SERS-0.50 membrane showed a 5-fold higher water flux and 2-fold increase in the Mg 2+ /Li + separation factor compared with the IP membrane. Moreover, the SIP-0.15 membrane with an enhanced positive charge density exhibited a considerably higher Mg 2+ /Li + separation factor (15.38, 500 % increase compared with that of the IP membrane) for brine with a Mg 2+ /Li + ratio of 20. This study provides a reference for developing nanofiltration membranes used for high-efficiency Mg 2+ /Li + separation.
研究领域:
材料科学
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环境工程
·
化学工程
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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
·
化学工程
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JOURNAL OF MEMBRANE SCIENCE
·
2023
·
IF 9.5
Quan Li,Yahui Liu,Yunling Jia,Yanhong Ji,Feng Yan,Jianxin Li,Younas Mohammad,Benqiao He
Constructing a suitable charged surface layer of nanofiltration (NF) membrane is one of the key challenges to achieve efficient Li + /Mg 2+ separation performance with high Mg 2+ /Li + mass ratio ( W Mg2+/Li+ ). Herein, we proposed a facile route, i.e., grafting the short chain amino-rich monomers (SCA, H(NHCH 2 CH 2 ) 1-4 -NH 2 ) instead of conventional amino-rich macro-monomers (ARM), to construct a separation layer with uniform positive charge on the surface of pristine polyamide (PA) NF membrane to achieve effective Li + /Mg 2+ separation. The SCA grafted NF membrane (PA-g-SCA) retained a more uniform distribution of positively charged groups on the PA layer compared with ARM grafted NF membrane. The SCA grafted NF membrane exhibited a high rejection of Mg 2+ and high permeation of Li + at the same time, leading to an extremely high separation factor for Li + /Mg 2+ of 130 even in the W Mg2+/Li+ of 200:1 in the feed, which greatly surpassed those reported. The pure water flux was 1.8 folds than that of the pristine NF membrane due to the hydrophilicity improvement. The results suggested that the distribution uniformity of positive charges could be the key to efficient Li + /Mg 2+ separation of the NF membrane. Our study provided a facile and robust route to design and construct high Li + /Mg 2+ separation performance NF membranes.
研究领域:
材料科学
·
环境工程
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Journal of Water Process Engineering
·
2023
·
IF 7
Lei Ma,Qiuyan Bi,Wanji Zhou,Xingliang Liu,Fuju Qi,Hao Zhang,Yifan Gao,Shiai Xu
Nanofiltration (NF) membrane with high selectivity and permeance is important for recovering lithium from salt lake brine. In this work, sandwich-like NF membranes were prepared using polyamide (PA) as the interfacial polymerization (IP) layer, dopamine (DA) and zwitterion-g-C 3 N 4 as the composite interlayer and polyethersulfone (PES) ultrafiltration (UF) membrane as the substrate. Three NF membranes were prepared with different zwitterion-g-C 3 N 4 : M3 membrane modified with C 5 H 12 ClNO 2 -g-C 3 N 4 , M4 membrane modified with C 12 H 24 N 2 O 4 S-g-C 3 N 4 and M5 membrane modified with C 19 H 39 NO 2 -g-C 3 N 4 , and their physical and chemical properties, separation capacity, and antifouling behaviour were analyzed. The zwitterion-g-C 3 N 4 composite interlayer improves the hydrophilicity and pore structure of NF membranes. The water contact angle (CA) of M5 membrane is 25.5°and its pore size is 0.49 nm. M5 membrane shows a high retention rate of 96.66 % for Mg 2+ in mixed salt solution (Mg 2+ /Li + = 84) and performs well in salt lake brine with a rejection of 97.90 % to Mg 2+ . The flux recovery ratio (FRR) can be kept above 93 %. This study may give ideas for the preparation of composite NF membrane for water softening and lithium utilization.
研究领域:
材料科学
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环境科学
·
化学工程
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JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
·
2013
·Vol. 69
·期 1
·1-8
·
IF 1.66
Wu Li-ang,Jiang Xiaochao,Wu Shali,Yao Rui,Qiao Xvsheng,Fan Xianping
Monolithic macroporous zirconia was synthesized through a new method involving an epoxide-driven sol–gel method accompanied by a spontaneous phase separation. The sol–gel transition utilized inorganic salt ZrCl 4 as primary precursor and propylene oxide as matrix former through a ring-opening reaction. Phase separation was induced with poly-(ethylene oxide) (PEO) and its tendency was adjusted by incorporating Mg 2+ /Y 3+ and N -methylformamide (NFA) in starting solution. The morphology of the dried gel changed from a solid nanoporous structure through a phase separated macroporous bicontinuous structure to aggregates particles when varying Mg 2+ or Y 3+ , NFA and PEO composition. An appropriate choice of the starting composition, by which the phase separation and gelation occurred parallel, allows the fabrication of macroporous zirconia monoliths in large dimensions (Φ = 30 mm, h = 8 mm). The skeleton of the monolithic macroporous zirconia gels possess a BET surface area of 271.7 m 2 /g. Accordingly, the effect and mechanisms of Mg 2+ , Y 3+ and NFA during gelation process were proposed in detail. Moreover, Mg 2+ or Y 3+ might also act as stabilizer to form the magnesia or yttria stabilized tetragonal or cubic zirconia after the samples were heat-treated at high temperature (800 °C).
研究领域:
材料科学
·
化学工程
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高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2020
·
IF 5.162
Jiali Yang,Ting Zhou,Yueming Jiang,Bao Yang
Prenylated flavonoids are good drug candidates due to multiple biological activities and health benefits. Prenyltransferase is an important enzyme involved in the biosynthesis of prenylated flavonoids. In this work, a flavonoid prenyltransferase (AhPT1) from Artocarpus heterophyllus showed an unexpectedly metal ion-induced specificity to flavonoid substrates. AhPT1 could catalyse 6- C -prenylation of genistein when Mg 2+ serving as cofactor. Its catalytic activity to 6-hydroxyflavone was undetectable. However, when Mn 2+ was used instead of Mg 2+ , 5- C -prenylated 6-hydroxyflavone was generated with a high conversion rate. Mn 2+ altered the regiospecificity of AhPT1 and turned it into a 5- C -prenyltransferase. 2′-Hydroxyl could improve the conversion rate of 6-hydroxyflavone, whereas 3′- or 4′-hydroxyl impaired the catalysis efficiency of AhPT1. NQIFDADID174 and DLTDVEGD305 were active motifs involved in substrate binding and catalysis. Asn166, Asp170, Asp174, Asp298, Asp301 and Asp305 in the active center were critical to the prenylation reaction.
研究领域:
生物化学
·
酶学
·
药理学
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高影响因子
WATER RESEARCH
·
2025
·
IF 12.4
Huijun Yu,Xieyang Xu,Yingsong Liu,Chenshuo Wang,Linxuan Gao,Jianbing Wang
Nanofiltration (NF) offers an energy-efficient approach for lithium recovery from brines. Conventional NF membranes rely on the positively charged polyamide layer formed via interfacial polymerization (IP) of polyethyleneimine (PEI) and trimesoyl chloride (TMC) to repel Mg 2+ more strongly than Li + , but their Mg 2+ /Li + selectivity remains constrained by limited control over pore size distribution. Here, we develop polyamide (PA) layers using amphiphilic dioctyl sulfosuccinate sodium (DOSS)-mediated electrospray interfacial polymerization (DEIP). Electrospray-assisted polymerization at the interfaces of abundant immiscible microdroplets produces thinner PA layers with reduced transport resistance and accelerates monomer diffusion in a non-selective manner. Molecular dynamics (MD) simulation and density function theory (DFT) calculations further reveal that DOSS selectively regulates the diffusion behavior of PEI and TMC within microdroplets, enabling the formation of PA layers with uniform pore structures and a positively charged surface. These structural advantages deliver precise ion sieving for lithium extraction, achieving a Mg 2+ /Li + selectivity of 142 and water permeance of 13.45 L·m −2 ·h −1 ·bar −1 . The DEIP membrane also demonstrates stable Mg 2+ /Li + separation over seven days of continuous NF operation. This work underscores the promise of DEIP membranes for high-efficiency lithium extraction and highlighted their potential for practical brine-based lithium recovery.
研究领域:
材料科学
·
膜技术
·
分离科学
·
环境工程
·
锂提取
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