COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2025
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IF 5.4
Kangjing Wu,Yunzhen Hu,Shuai Wang,Zhanfang Cao,Xin Ma,Hong Zhong
Solvent extraction is considered as an eco-friendly and efficient technology to extract manganese from an industrial leaching solution based on ores or post-consumer products. However, it is imperative to propose a novel extractant capable of independently and selectively extracting manganese ions from impurities since the separation efficiency of a single extractant is limited. We introduced a novel extractant di-neodecyl ethanedione monoxime (DEM) to extract manganese ions and conducted a comparative extraction analysis with neocapric acid (Versatic 10). The maximum extraction efficiencies of DEM and Versatic 10 separately achieved at 97.34% and 87.62%. And the selectivity tests for the extraction and separation of Mn 2+ and Mg 2+ suggested that DEM exhibited superior selectivity towards manganese ions than Versatic 10. FTIR spectrum analysis, saturation capacity experiments and mass spectrometry suggest that DEM can form a dual-ligand six-membered ring metal complex with manganese or magnesium ions through the formation of coordination bonds of N−O−M and C−O−M (M=Mn 2+ or Mg 2+ ). EDA-NOCV analysis illustrated that the π-backbonding between manganese atoms and extractant ligands contributes to the selectivity separation of manganese and magnesium ions. And the π-backbonding bond between the oxime group (–C=N–OH) and the manganese ion is stronger than that of the carbonyl group (–(C=O)–OH), confirming that DEM demonstrated superior selectivity compared to Versatic 10 in extracting manganese ions from magnesium ions.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2024
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IF 8.1
Ping Li,Yuan Zhou,Chunxi Hai,Yu Tang,Ying Cheng,Yanxia Sun,Shengde Dong,Luxiang Ma,Xin He,Qi Xu
As a promising technology for lithium extraction from salt lakes, nanofiltration membranes still face challenges in balancing between permeability and selectivity. In this paper, highly dispersed functionalized boron nitride nanosheets (BNNSs-NH 2 ) were prepared by modifying exfoliated boron nitride nanosheets (BNNSs) with polydopamine, which were incorporated into a polyamide (PA) layer by aqueous phase conditioning to prepare positively charged polyamide nanofiltration membranes. Scanning electron microscopy (SEM) showed that the PDA nanoclusters on the surface of the BNNSs can disrupt the regular stacking parallel to the membrane surface. Energy spectrum (EDS) of SEM and X-ray photoelectron spectroscopy (XPS) etching further revealed that BNNSs-NH 2 were dispersed within PA layer, creating transmembrane channels for molecular diffusion. The results showed a pure water permeance of 8.55 ± 0.24 L/m 2 h bar, indicating that the stabilized intercalation of BNNSs-NH 2 in the PA layer synergistically improved the water permeability. Meanwhile, the retention rate of MgCl 2 remained at 94 %, which was attributed to the enhanced compatibility between BNNSs-NH 2 and polyamide matrix by the polydopamine coating (PDA) on the surface, as well as the Dornan effect repulsion by the enhanced positive charge on the membrane surface. After the three-stage nanofiltration of membrane, the Mg 2+ /Li + ratio decreased from 50 to 0.12. Overall, this method balances permeability and selectivity by adjusting pore size and positive charge, potentially offering new ideas and insights for the preparation and development of nanofiltration membranes for Mg 2+ /Li + separation.
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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高影响因子
RARE METALS
·
2026
·Vol. 45
·期 5
·e70353
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IF 12.1
Kai Jia,Fuying Wu,Beibei Xiao,Ting Bian,Petr Senin,Daifen Chen,Liuting Zhang
en This link goes to a English section zh This link goes to a Chinese section The protracted incubation time has long been the Achilles' heel of the promising 2LiBH 4 –MgH 2 hydrogen storage system. Instead of the usual route-creating heterogeneous nucleation sites to hasten MgB 2 formation, we shortened both de- and re-hydrogenation incubation periods by steering the Mg transformation itself. Herein, this paper engineered a Prussian blue analog whose surface charge landscape traps Mg 2+ and the released electrons in a non-stoichiometric lattice, keeping them instantly available for MgB 2 nucleation. Theory and experiment show that CoFe–PBA stores both ions and electrons. Under the same experimental temperature, the optimized LiBH 4 –MgH 2 hydrogen storage system demonstrates remarkable performance improvements: Its incubation period is significantly reduced to just one seventh that of the original hydrogen storage material, achieving a leap forward in reaction kinetics efficiency. The above concept provides a versatile tool for any catalytic system constrained by nucleation delays and opens new avenues for energy-related research. 摘要 en This link goes to a English section zh This link goes to a Chinese section 2LiBH 4 –MgH 2 高容量储氢体系的实际应用长期受限于漫长的MgB 2 成核孕育期。本研究另辟蹊径,通过储镁效应对镁自身转化过程进行调控而非采用传统的制造异质成核位点来加速MgB 2 的生成,从而成功缩短了该体系吸放氢过程的孕育期。首先设计合成了一种普鲁士蓝类似物(CoFe–PBAs),其表面电荷分布特性可将Mg 2+ 及其释放的电子捕获于非化学计量晶格中,使其随时可用于MgB 2 的成核。理论与实验共同证实,CoFe–PBAs能同时储存镁离子与电子;在相同实验温度下,优化后的LiBH 4 –MgH 2 储氢体系展现出显著的性能提升:其孕育期大幅缩短至未改性体系的七分之一,实现了无催化体系反应动力学效率的飞跃。上述概念开辟了能源催化领域相关研究的新调控途径,为任何受成核延迟限制的催化体系提供了一种普适性的解决方案。
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ACS Applied Materials & Interfaces
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2021
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IF 9.229
Yaqi Li,Pengjian Zuo,Ruinan Li,Hua Huo,Yulin Ma,Chunyu Du,YunZhi Gao,Geping Yin,Robert S. Weatherup
Rechargeable Mg-ion batteries typically suffer from either rapid passivation of the Mg anode or severe corrosion of the current collectors by halogens within the electrolyte, limiting their practical implementation. Here, we demonstrate the broadly applicable strategy of forming an artificial solid electrolyte interphase (a-SEI) layer on Mg to address these challenges. The a-SEI layer is formed by simply soaking Mg foil in a tetraethylene glycol dimethyl ether solution containing LiTFSI and AlCl3, with Fourier transform infrared and ultraviolet–visible spectroscopy measurements revealing spontaneous reaction with the Mg foil. The a-SEI is found to mitigate Mg passivation in Mg(TFSI)2/DME electrolytes with symmetric cells exhibiting overpotentials that are 2 V lower compared to when the a-SEI is not present. This approach is extended to Mg(ClO4)2/DME and Mg(TFSI)2/PC electrolytes to achieve reversible Mg plating and stripping, which is not achieved with bare electrodes. The interfacial resistance of the cells with a-SEI protected Mg is found to be two orders of magnitude lower than that with bare Mg in all three of the electrolytes, indicating the formation of an effective Mg-ion transporting interfacial structure. X-ray absorption and photoemission spectroscopy measurements show that the a-SEI contains minimal MgCO3, MgO, Mg(OH)2, and TFSI–, while being rich in MgCl2, MgF2, and MgS, when compared to the passivation layer formed on bare Mg in Mg(TFSI)2/DME.
研究领域:
材料科学
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电化学
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PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Hao Luo,Huawen Peng,Qiang Zhao
Nanofiltration plays emerging roles in lithium extraction from salt-lake brines with high magnesium-to-lithium (Mg 2+ /Li + ) ratio, yet current lithium extraction nanofiltration membranes show relatively low water permeability. A new monomer (1-(2-hydroxyethyl)-1,3,5,7-tetraazaadamantane-1-ium bromide, HMTAB) was designed to improve membrane separation performances by means of surface modification. Infrared characterizations show that the HMTAB monomer was anchored the pristine polyethylenimine (PEI) thin film composite membrane through esterification condensation. Average roughness of the HMTAB membrane is relatively small (5.7 nm), while the thickness of the top-layer was increased by ∼ 20%, i.e., from 90 to 110 nm. Water flux of the HMTAB membrane in filtrating Mg 2+ /Li + mixture (2000 ppm, Mg 2+ /Li + : 100) at 6 bar pressure is 97.9 L m -2 h −1 , which is 3.6 times as high as the pristine PEI membrane. Meanwhile, the Mg 2+ /Li + ion selectivity of the HMTAB membrane is maintained, and the membrane reduced the high Mg 2+ /Li + ratio (50) in the feed to a relatively low value (4.9) in the permeate. Last, the modified membrane exhibits stable performance in 40 h’ continuous nanofiltration.
研究领域:
材料科学
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环境工程
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高影响因子
ACS Photonics
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2021
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IF 7.529
Feiyang Ren,Fan Chen,Enrou Mei,Xiaojuan Liang,Peng-cheng Qian,Weidong Xiang
The instability of perovskites is the most critical unsolved problem that limits their practical application. In this work, magnesium oxide (MgO) was introduced into perovskite nanocrystals (PNCs) by the traditional hot injection strategy (HI), resulting in a decrease in the defects PNCs; therefore the photoluminescence quantum yield (PLQY) can be effectively improved. CsPb(Br/I)3-Mg@styrene-ethylene-butylene-styrene (SEBS) composite films were prepared by mixing perovskite nanocrystals and a SEBS toluene solution. Benefiting from the effective protection of the SEBS matrix, the blue light exposure, and thermal and water stability of PNCs are greatly improved. By combining a red composite film with a Ce:YAG phosphor and an InGaN blue chip, the color rendering index (CRI) of the assembled white light-emitting diodes (WLEDs) can exceed 90 (Ra > 90). Additionally, a light-emitting device with a wide color gamut of 128% of the National Television Standards Committee (NTSC) was achieved by combining green and red composite films with blue chips. The stable and flexible composite film will promote the application of PNCs in the field of general lighting applications and thin-film displays.
研究领域:
材料科学
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光学工程
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电子工程
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高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2023
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IF 2.6
Xudong Yu,Xia Feng,Shan Feng,Yun Peng,Ying Zeng
The solid–liquid equilibria of the quinary system Li+, K+, Mg2+//Cl–, B4O72––H2O at 323.2 K were investigated by the isothermal dissolution method. The solubility, refractive index, and density of the system were determined, and the corresponding space phase diagram, planar projection diagram, water content diagram, and density/refractive index vs composition diagrams saturated with MgB4O7 are constructed based on the experimental data. The result shows that there are double salts of lithium carnallite (LiCl·MgCl2·7H2O) and carnallite (KCl·MgCl2·6H2O) formed in the system. The space phase diagram consists of five invariant points, 16 isothermal solution curves, and eight crystalline regions (Li2B4O7·3H2O, K2B4O7·4H2O, KCl, MgB4O7·9H2O, KCl·MgCl2·6H2O, MgCl2·6H2O, LiCl·MgCl2·7H2O, LiCl·H2O). Under the saturation of salt MgB4O7, the crystalline region of Li2B4O7·3H2O is the largest in the planar projection diagram of this system, and the solubility of LiCl is the largest. A comparison of planar projection diagrams (under the saturation of salt MgB4O7) of the system at 273.2 and 323.2 K shows that the crystallization regions of Li2B4O7·3H2O, KCl·MgCl2·6H2O, LiCl·MgCl2·7H2O, and LiCl·H2O increase along with the temperature, while those of K2B4O7·4H2O and KCl decrease. The results show that low temperature is conducive to the extraction of potassium in the form of K2B4O7·4H2O and KCl and has less entrainment loss; high temperature is beneficial to the precipitation of Li2B4O7·3H2O.
研究领域:
化学工程
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材料科学
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2026
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IF 9
Wei Shao,Xiuling Liu,Zhaojing Jing,Ziyang Guo,Xiaowen Huo,Weihao Zhang,Haitao Wang,Na Chang
The selective separation of lithium and magnesium by conventional nanofiltration (NF) membranes remains a major challenge for lithium extraction from salt-lake brine. This difficulty results from the extremely fast and disordered nature of the interfacial polymerization process, which hampers precise control over the pore size of the separation layer. In this study, to utilize the hollow internal cavity of the macrocycle, calix[4]arene was directly sulfonated to prepare hydrophilic sulfonated calix[4]arene (SC[4]A), which was incorporated as an aqueous-phase additive into the piperazine (PIP) solution. NF membranes were then fabricated via interfacial polymerization (IP) on a self-made polysulfone (PSf) substrate. The results demonstrated that SC[4]A effectively accelerated the kinetics of the IP reaction. More importantly, SC[4]A, which was ionically bonded into the polyamide (PA), served as the additional mass transfer channel and formed a separation layer with a smaller free volume, narrower pore size distribution, and enhanced negative surface charge. The prepared TFC-0.5 membrane exhibited a Li + /Mg 2+ separation factor as high as 28.90, a 2.19-fold increase over the pristine membrane. Additionally, the incorporation of SC[4]A improved the hydrophilicity of the membrane surface, imparting superior antifouling properties to the modified membrane. By precisely regulating the IP process and tailoring the free volume of the separation layer, this study provides a new strategy for developing high-performance lithium‑magnesium separation NF membranes.
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高影响因子
JOURNAL OF MEMBRANE SCIENCE
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2026
·
IF 9
Xiaohui Yi,Shao-Lu Li,Jun Xiao,Niamat Ullah,Hongfen Zuo,Yunxia Hu,Genghao Gong
Efficient separation Mg 2+ and Li + is crucial for lithium extraction from salt-lake brines because the two cations have very similar chemical and physical properties. In this work, we synthesized a novel bis-pyridinium amino monomer, 1,1'-(ethane-1,2-diyl)bis(3-aminopyridin-1-ium) (BAPE), and grafted it onto the PEI-TMC membrane surface. By regulating the BAPE grafting concentration, both the surface charge and effective pore size were systematically modulated. The optimized BAPE-grafted membranes exhibited a strongly positive zeta potential (19.9 mV at pH 7) and a water permeance of 24.5 LMH/bar, 4.4 times that of the pristine membrane, while maintaining a high MgCl 2 rejection of ∼98.6 % using a 1000 ppm MgCl 2 feed solution. Notably, a single filtration stage reduced the Mg 2+ /Li + ratio from 20 in the feed to 0.48 in the permeate, corresponding to a high selectivity (S Mg 2+ /Li + ) of 41.6 (2000 ppm, Mg 2+ /Li + ratio of 20). The modified membranes also demonstrated excellent long-term stability over 72 h. These results underscore the value of rational molecular design, introducing pyridinium functionality by surface grafting, as a promising route to high-performance nanofiltration membranes for brine with high Mg 2+ /Li + ratios.
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高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
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2022
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IF 5.876
Yongbiao Sun,Jianfeng Tang,Guangyan Li,Yihuai Hua,Yunbing Sun,Suyang Hu,Xiaojin Wen
The Li + , K + , Mg 2+ and Ca 2+ -exchanged X zeolites were prepared using ion exchange method for producing efficient adsorbents that could be used in the purification of liquefied natural gas (LNG). The adsorption, separation and regeneration characteristics of the samples were systematically explored and discussed using static adsorption of pure gases, dynamic adsorption of a binary gas mixture (3%CO 2 and 97%CH 4 ) and regeneration experiments. The results showed that Li13X had the largest surface area of 520 m 2 /g, whereas Ca13X possessed the highest micropore volume of 0.25 m 3 /g with the smaller pore size observed from the pore size distribution . The adsorption capacity of Li13X for CO 2 (4.10 mmol/g) was almost the same as that of Ca13X (4.12 mmol/g), which were larger than all the other samples at 120 kPa and 30 °C. However, K13X had the highest static CO 2 /CH 4 separation factor of 46, which was due to the increased basicity of the framework. For the dynamic adsorption, Ca13X possessed the highest CO 2 /CH 4 separation factor of 93, and showed the smallest CH 4 adsorption capacity of 1.22 mmol/g. As for the regeneration of the proposed adsorbents, the heat requirement for CO 2 in dynamic was not only affected by the isosteric heat, but was also dependent on the competition between CH 4 and CO 2 . Moreover, the static and dynamic vacuum regenerations had the same tendency and mainly depended on the pore size distribution.
研究领域:
材料科学
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化学工程
·
环境科学
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能源技术
·
吸附分离
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2026
·
IF 9.1
Yingzhen Wu,Enshen Shi,Haojie Song,Lu Li,Chungang Xie,Yongjiang Yu,Yanan Liu,Zhongyi Jiang
Nanofiltration membranes possess great potential in ion separation, meanwhile, the pore and surface properties determining membrane permeance and selectivity, should be designed and regulated. Herein, we utilized reactive ionic liquid (1-aminoethyl-3-methylimidazolium tetrafluoroborate, AMIM-BF 4 ) simultaneously as aqueous phase additive and surface modifier to regulate pore and surface properties for fast and efficient Li + /Mg 2+ separation. AMIM-BF 4 was added in aqueous phase to undergo a competitive interfacial polymerization with polyethyleneimine (PEI), effectively increasing the average pore size of the membrane. Then, amino group in AMIM-BF 4 could react with the unreacted acyl chloride groups to modify membrane surface, increasing its positive charge and hydrophilicity. Accordingly, the membrane possessed high water permeance of 33.3 L m −2 h −1 bar −1 with MgCl 2 rejection rate of 98.9%, and separation factor of 22.7 for the mixed solution with magnesium-to‑lithium ratio (MLR) of 50:1. Meanwhile, during the 168-h continuous cross-flow test, the rejection rate for MgCl 2 remained above 98.1% with stable water permeance. Moreover, through the three-stage nanofiltration experiment, the membrane could reduce the MLR of simulated salt lake brine with 2000 ppm from 50:1 to only 0.02:1, demonstrating its potential for efficient lithium enrichment from complex brine.
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2026
·
IF 9.1
Zhiyun Kong,Yalin Shi,Haike Li,Yue Li,Aotian Liu,Rui Gong,Huan Zhang,Xiaolei Wang
To achieve a high efficiency separation of Mg 2+ and Li + , it is essential to precisely regulate the membrane's surface charge density and pore size. This work proposed a strategy for fabricating polyamide (PA) layer with ion-imprinted structures via interfacial polymerization (IP) assisted by ion-imprinting technology (IIT). Cu(II) was added to the Polyethyleneimine (PEI) aqueous phase to regulate the structure of PA nanofiltration (NF) membranes. After removal of Cu(II), PA-IIM 0.16 exhibited a selectivity factor of 44.27 for Mg 2+ /Li + mixture (2000 mg L −1 , 120:1). Upon the completion of the initial NF process, the Mg 2+ /Li + mass ratio underwent a significant reduction, dropping from the starting value of 120 to 2.32. This method facilitates the rapid penetration of Li + while preserving the high rejection of Mg 2+ by meticulously modulating the NF layer in terms of its pore size as well as its surface charge.
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