Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Xiaomin Ren,Yingying Chen,Yu Wang,Hongyan Fu,Dan Hu,Xudong Feng
The positively charged nanofiltration membrane (NF) has a strong repulsive effect on divalent magnesium ions, thus could be applied for the separation of Mg 2+ /Li + . Chemical grafting modification is an effective way to prepare positively charged membranes. However, it is difficult to achieve chemical modification on the surface of polyamide membrane as the chemical stability of polyamide. By introducing hydroxyl rich monomers (3-[n-tris(hydroxymethyl)methylamino]−2-hydroxypropanesulfonic, HMAH) as active sites in the interfacial polymerization process, the olefin monomers containing quaternary ammonium salt functional groups (acryloxyethyl trimethyl ammonium chloride, ATA) were reacted onto the surface of NF membrane through radical polymerization initiated by cerium ions to obtain positively charged NF membrane. The successful grafting reaction of quaternary ammonium salt monomer onto the surface of NF membrane was verified by Fourier-transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS) and scanning electron microscope (SEM). The membrane with dense and smooth surface layer showed C-N + characteristic peak in XPS N1s spectra and high isoelectric point. Meanwhile, the as-prepared membrane achieved high MgCl 2 rejection of 95.74% and low LiCl rejection of 18.1%, with pure water permeance of 9.43 L·m −2 ·h −1 ·bar −1 . After 60 hours of mixture filtration experiment, the membrane exhibited good long-term stability, maintaining the ionic separation selectivity over 30, which indicated that the positively charged membrane prepared by grafting method has potential application in the separation of Mg 2+ /Li + .
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
WATER RESEARCH
·
2025
·
IF 12.4
Xiongrui Jiang,Lingjie Zhang,Yanhui Miao,Licai Chen,Jiaoyan Liu,Tingting Zhang,Shuai Cheng,Yuhan Song,Yunliang Zhao
Stacking two-dimensional (2D) nanosheets into lamellar membranes holds great promise in the selective separation of Li + and Mg 2+ from salt-lake brines, but revealing the intrinsic effect of nanosheet properties on the ion transport remains a great challenge. The primary reasons are inevitable emerging defects and changes in surface functional groups during nanosheet preparation. Here, we successfully demonstrated the intrinsic dependence of ion separation on the size and layer charge density of 2D building blocks using defect-free and inherently permanent charged clay nanosheets. The smaller-sized nanosheets readily assembled into lamellar membranes with narrower nanochannel dimension, which facilitated the steric hindrance effect to improve the Li + /Mg 2+ selectivity. Experiments and calculations demonstrated the layer charge density-dependent ion separation as well, for which a novel mechanism of intrinsic selective separation driven from the energy barrier difference of ions transport was proposed. Based on the “internal” regulation of the intrinsic nanosheet properties, MMT membranes realized stable and efficient Li + /Mg 2+ separation under extreme conditions, multi-cycle and long-term experiments, with an optimal S Li/Mg of 38.9, superior to most of the reported state-of-the-art membranes. This work reveals the intrinsic interplay of nanosheet properties tuning the ion transport and separation, which will inspire the design and development of advanced 2D lamellar membranes, particularly for sustainable and environmental energy exploitation.
研究领域:
材料科学
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环境科学
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化学工程
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2020
·Vol. 137
·期 47
·49549
·
IF 2.52
Muhammad Awais Ashraf,Junfeng Wang,Baichun Wu,Penglei Cui,Baohua Xu,Xingchun Li
Extraction of lithium from high Mg 2+ /Li + ratio salt lake brine with the nanofiltration (NF) membrane is significantly challenging. Interfacial polymerization was utilized for the facile modification of NF membranes with polydopamine (PDA) and polyethylenimine (PEI) to enhance lithium separation efficiency. Comparing permeability and salts rejection (Li + and Mg 2+ ) of three NF membranes before and after PDA/PEI deposition, it was observed that separation efficiency was not only dependent on steric hindrance but also affected by Donnan exclusion mechanism. In the case of NF270 membrane after facile polymerization, due to small pore size distribution and low charge density confirmed by zeta potential measurements, Li + permeability was reached about 95% at a flux of 21.33 L·m −2 ·h −1 . Although with the DK membrane, separation factor SF Li/Mg was also increased up to 60 after modification, the pore narrowing effect significantly decreased lithium permeability and flux. Experimental results showed that facile modification not only enhanced stability and hydrophilicity but also reduced the high Mg 2+ /Li + ratio from 30 to 4.1 in single-stage separation.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2018
·Vol. 6
·期 35
·17075-17085
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IF 9.931
Hancheng Yuan,Yuanying Yang,Yanna NuLi,Jun Yang,Jiulin Wang
Rechargeable magnesium–selenium (Mg–Se) batteries are promising electrochemical systems with higher energy density than traditional magnesium batteries. It has been widely accepted that electrophilic selenium cathodes can only be chemically compatible with non-nucleophilic electrolytes. Herein, we report for the first time on Mg–Se batteries containing a selenized polyacrylonitrile (Se/PAN) cathode, Mg anode and nucleophilic electrolyte. The Se/PAN composite with a moderate Se content (45.37 wt%) exhibits high rate capacity and cycling stability in an easily prepared (PhMgCl)2–AlCl3 based electrolyte. It delivers an initial discharge capacity of 338.2 mA h g−1 based on the mass of the whole composite at a rate of 100 mA g−1, and the capacity can be maintained at around 188.4 mA h g−1 after 100 cycles. Even at a high rate of 400 mA g−1, a capacity of 118.3 mA h g−1 can be obtained after 800 cycles with an inappreciable capacity decay of 0.021% per cycle, which is comparable to that of previously reported Mg–Se batteries using non-nucleophilic electrolytes. The excellent performance is attributed not only to the structural advantage of the material, but to the compatible electrolyte. Well trapped Sen chains in the polymer backbone facilitate electron/ion transport and improve reaction kinetics, leading to high reactivity and utilization of Se with suppressed shuttle effect. In addition, the polymer backbone could buffer the volume changes during the electrochemical process and mitigate the structural degradation. Furthermore, the effective SEI film preserves the cathode and prevents it from irreversible reaction with the electrolyte. This work proposes combining a conductive Se/PAN cathode and a compatible electrolyte to promote the performance of Mg–Se batteries, with a view to sparking intense research interest in Mg–Se batteries with easily prepared nucleophilic electrolytes.
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2016
·
IF 2.758
Renping Cao,Jijun Huang,Xiangfeng Ceng,Zhiyang Luo,Wen Ruan,Qianglin Hu
Novel LiGaTiO 4 :Mn 4+ and LiGaTiO 4 :Mn 4+ , R (R=Mg 2+ and Al 3+ ) phosphors are synthesized by solid-state reaction method in air. Emission spectra of LiGaTiO 4 :Mn 4+ phosphor with excitation 330, 395, and 470 nm contain three emission bands peaking at ~668, 680, and 696 nm in the range of 610–800 nm, and excitation spectrum monitored at 668 nm contains broad excitation band with three excitation peaks located at ~330, 395, and 480 nm within the range 250–600 nm, which indicate that LiGaTiO 4 :Mn 4+ phosphors can be effectively excited by ultraviolet, near ultraviolet, and blue light-emitting diode chips. The optimal Mn 4+ doping concentration is ~0.6 mol% in LiGaTiO 4 :Mn 4+ phosphor. Time resolved luminescence spectra and these lifetime data indicate that it is only a single type of Mn 4+ ion luminescent center in LiGaTiO 4 :Mn 4+ phosphor. Emission intensity of LiGaTiO 4 :Mn 4+ phosphor may be enhanced 1.3–2.2 times by co-doping Mg 2+ and Al 3+ ions. The luminous mechanism of Mn 4+ ion is analyzed by Tanabe-Sugano energy diagram and configurational coordinate diagram.
研究领域:
材料科学
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光学
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产品关联
DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2022
·Vol. 29
·期 29
·44794-44805
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IF 5.19
Wu Mingda,Lu Linghong,Zhou Tao,Ma Yi,Weng Zhengsong
Calcium and magnesium ions usually exist in natural water. When Cd 2+ is removed from water by adsorption, it will be inhibited by these two ions. Titanate nanotubes (TNTs) have an effective adsorption capacity for Cd 2+ due to extraordinary ion exchange property. However, TNTs also adsorb Ca 2+ and Mg 2+ in water. In this study, carbon-modified TNT (TNT/C) and TNT/C further treated with acid (TNT/HC) were synthesized by hydrothermal synthesis. The transmission electron microscope (TEM) images show that TNT/C or TNT/HC still keep nanotube morphology. The experimental results show the order of adsorption amount to Cd 2+ is TNT (171.56 mg/g) > TNT/C (166 mg/g) > TNT/HC (159.88 mg/g) when there is no Ca 2+ or Mg 2+ . But when there is 0.1 M Ca 2+ or Mg 2+ in the water, the order of Cd 2+ adsorption capacity becomes TNT/HC (44.28, 49.04 mg/g) > TNT/C (58.84, 69.32 mg/g) > TNT (65.52, 70.6 mg/g). It indicates that the surface carbon modification can alleviate the hindrance of Ca 2+ or Mg 2+ to Cd 2+ removal. This is because the carbon on the surface of TNT captured part of Ca 2+ or Mg 2+ ; it made more Cd 2+ be successfully absorbed by TNT through ion exchange. This mechanism was confirmed by the X-ray photoelectron spectroscopy (XPS) spectra analysis. The results of this paper can provide ideas for the adsorption and removal of Cd 2+ in water in the presence of Ca 2+ or Mg 2+ .
研究领域:
环境科学
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材料科学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2022
·
IF 10.53
Tianrun Gu,Runnan Zhang,Shiyu Zhang,Benbing Shi,Junhui Zhao,Zhen Wang,Mengying Long,Guangzhe Wang,Ting Qiu,Zhongyi Jiang
The efficient separation of Li + /Mg 2+ is the key to lithium extraction from salt lake brine. Herein, a multi-amino quaternary ammonium salt (3,5-dimethylhydrazide-benzyl trimethyl ammonium bromide, DHTAB) was designed and synthesized to modify pristine polyamide (PA) nanofiltration membranes. DHTAB was grafted on the surface of the PA nanofiltration membrane to construct a positively selective layer for Li + /Mg 2+ separation. The introduction of DHTAB increased the membrane surface charge density to +5.16 mC m −2 , which was nearly three times that of the pristine PA membrane. The increased charge density of the modified membrane led to a stronger Donnan exclusion for Mg 2+ , and accordingly a high MgCl 2 rejection of 99.2%. The modified membranes exhibited a high Li + /Mg 2+ separation factor of up to 60.1, when applied for MgCl 2 and LiCl binary solution, which exceeded all known PA-based nanofiltration membranes.
研究领域:
材料科学
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化学工程
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2021
·Vol. 31
·期 42
·2103214
·
IF 18.808
Xianbo Yu,Guangyu Zhao,Chao Liu,Canlong Wu,Huihuang Huang,Junjie He,Naiqing Zhang
Owing to the low-cost, dendrite-free formation, and high volumetric capacity, rechargeable Li + /Mg 2+ hybrid-ion batteries (LMIBs) have attracted great attention and are regarded as promising energy storage devices. However, due to the strong Coulombic interaction of Mg 2+ with host materials, the traditional “Daniell Type” LMIBs with only Li + intercalation usually cannot ensure a satisfactory energy density. Herein, graphene monolayers are arranged intercalating into MoS 2 interlamination to construct van der Waals heterostructures (MoS 2 /G VH). This operation transforms the construction of ion channels from pristine interlamination of two MoS 2 monolayers to the interlamination of MoS 2 monolayer with graphene monolayer, thereby greatly reducing ion diffusion energy barriers. Compared with pristine MoS 2 , the MoS 2 /G VH can obviously reduce the migration energy barriers of Li + (from 0.67 to 0.09 eV) and Mg 2+ (from 1.01 to 0.21 eV). Moreover, it is also demonstrated that MoS 2 /G VHs realize Li + /Mg 2+ co-intercalation even at a rate current of 1000 mA g −1 . As expected, the MoS 2 /G VH exhibits superior electrochemical performance with a reversible capacity of 145.8 mAh g −1 at 1000 mA g −1 after 2200 cycles, suggesting the feasibility of potential applications for high-performance energy storage devices.
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Nano
·
2024
·
IF 15.8
Yu Han,Jiaxiang Ma,Dongqing Liu,Yan Yang,Tao Zhang,Min Wang,Daxin Liang,Liping Wen,Jun Ma,Wei Wang
Ion-sieve adsorbents are effective materials in practical applications for extracting liquid lithium. However, it is greatly suppressed in adsorption capacity and selectivity (Li/Mg) under natural near-neutral conditions of seawater or salt lakes, due to the interference of in situ released H+ and Mg2+ impurity. This paper proposes an adsorbent with a microenvironment-modulating function as a solution. The introduction of quaternary ammonium groups into the carrier accelerates the migration of H+, while preventing the diffusion of Mg2+ by electrostatic repulsion. Besides, it can also prestore OH–, effectively consuming the generated hydrogen ions in situ. Based on the rational design, the alkali consumption of the microenvironment-modulating strategy is dramatically reduced to 1/144 of the traditional alkali-adding method. Additionally, adsorption performance is significantly promoted under natural pH conditions, with a maximum 33 times higher separation factor (selectivity) and 4 times higher adsorption capacity than commercial ion-sieve adsorbents. This development indicates the feasibility of using microenvironment modulation for effective lithium extraction and inspires the development of next-generation high-performance adsorbents.
研究领域:
材料科学
·
环境工程
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化学工程
·
可持续能源
✓ 已验证
产品关联
DOI
PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2025
·
IF 5.4
Haichen Lu,Hongjuan Sun,Wenjing Ding,Bo Liu,Lingyan Chu,Zhenxuan Wang
This study proposes a regulation strategy to address the intractable flotation separation challenge of quartz-talc associated systems. Herein, we identify a cation-gated flotation-selectivity mechanism in aqueous media: site-specific Mg 2+ adsorption at mineral interfaces dictates separation. At pH 2.0 and 150 g/t collector, the concentrate assayed 99.97% SiO 2 with 93.97% recovery. Adsorption simulations validate that the selective adsorption of Mg 2+ on the hydroxylated quartz surface adheres to the standard interfacial activation mechanism. It augments the contact between the quartz surface and water molecules, causes structured reorientation of water molecules, facilitates quartz surface hydroxylation, and increases system hydrophilicity. Mg 2+ titration elicits a biphasic switch: below 3×10 -3 mol/L it site-selectively hydroxylates quartz, amplifying hydrophilicity; above this threshold it collapses the electrical double layer, indiscriminately hydrophilizing all surfaces and abolishing selectivity. These findings provide a theoretical basis and a technical strategy for the efficient purification of complex associated quartz ores.
研究领域:
矿物加工
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表面化学
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浮选技术
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材料科学
✓ 已验证
DOI
高影响因子
MACROMOLECULAR RAPID COMMUNICATIONS
·
2025
·
IF 4.3
Bo Peng,Shuai Gu,Hongwei Lu,Juntao Tang,Chunyue Pan,Guipeng Yu
Developing high-efficiency antifouling nanofiltration (NF) membranes is crucial to address the dual challenges of low separation selectivity and severe membrane fouling in lithium extraction from high Mg 2+ /Li + ratio salt-lake brines. This study presents an efficient strategy based on one-step dip-coating surface modification. By grafting 1, 2-epoxy-3,3,3-trifluoropropane (TFO) molecules onto a PEI-TMC polyamide (PA) base membrane, a unique bipolar electrostatic potential reconstruction was triggered, simultaneously and significantly enhancing both the separation selectivity and antifouling performance of the membrane. In simulated high Mg 2+ /Li + ratio brine (2000 ppm, Mg 2+ /Li + = 30:1), the PA-TFO 0.75 membrane demonstrated exceptional integrated performance by achieving a high Li + /Mg 2+ selectivity of 20.5 (9.76 times higher than commercial NF membranes) while maintaining a high water permeance of 14.65 L m −2 h −2 bar −1 , and exhibiting an outstanding flux recovery ratio (FRR) approaching 100.6% (a 151% improvement over the pristine membrane), thereby meeting industrial fouling resistance standards. Critically, this strategy enabled the continuous fabrication of large-area membranes (60 m × 0.298 m). The assembled spiral-wound module (1812-type) retained a Li + /Mg 2+ selectivity of 19.5 in the same simulated brine, providing an efficient, antifouling, and scalable industrial-scale solution for lithium extraction from high Mg 2+ /Li + ratio salt lakes.
研究领域:
膜科学
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分离技术
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材料科学
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环境工程
·
资源可持续回收
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ELECTROCHIMICA ACTA
·
2019
·
IF 5.383
Aijia Wei,Wen Li,Qian Chang,Xue Bai,Rui He,Lihui Zhang,Zhenfa Liu,Yanji Wang
Mg 2+ /F − co-doped LiNi 0.5 Mn 1.5 O 4 cathode material was synthesized by a facile one-step solid-state process. The effect of Mg 2+ /F − co-doping on grain morphology, phase structure, and electrochemical properties was studied by a series of characterizations. Scanning-electron-microscopy images show that Mg 2+ /F − co-doped LiNi 0.5 Mn 1.5 O 4 (denoted LNMO-MF) particles grow larger than pure LiNi 0.5 Mn 1.5 O 4 particles. X-ray diffraction, Raman spectra , Fourier transformation infrared spectroscopy , X-ray photoelectron spectroscopy, and cyclic-voltammetry tests indicate that all samples mainly display a Fd -3m space group and more Mn 3+ ions in the LNMO-MF sample after Mg 2+ /F − co-doping, which is conducive to increasing the cationic disorder degree and enhancing the electronic conductivity of electrode material. Results show that the LNMO-MF cathode material delivers an excellent rate performance with discharge capacities of 142, 144, 140 136, 132, 124, 115, and 100 mAh g −1 at 0.2, 0.5, 1, 2, 3, 5, 7, and 10C (1C = 140 mAh g −1 ), respectively. Remarkably, LNMO-MF also shows cycling stability with a capacity retention of 86.2% at 5C after 400 cycles, which is much higher than that of pure LiNi 0.5 Mn 1.5 O 4 (67.7%). The improvement of LNMO-MF's electrochemical properties could be ascribed to the Mg 2+ /F − co-doping, delivering a more stable structure, better crystallinity , the highest Li + diffusion coefficient , and the lowest charge-transfer resistance.
研究领域:
材料科学
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电化学
·
无机非金属材料
·
能源存储
·
锂离子电池
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固态化学
·
功能材料
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）