JOURNAL OF MEMBRANE SCIENCE
·
2024
·
IF 8.4
Yingyao He,Guiliang Li,Haibo Lin,Qiu Han,Yinlu Ye,Jianqiang Wang,Fu Liu
Selective separation property enhancement is quite important for membranes separations, especially for high mass ratio Mg 2+ /Li + separations. Low selectivity and unclear separation mechanism are the challenges for current membranes. In this study, we designed 4-aminophenyl-15-crown-5 incorporated polyamide nanofiltration membranes through interfacial polymerization for Li + enrichment. The electrochemical tests and energy barrier calculations using transition state theory confirmed that the crown ether in nanofiltration membrane is responsible for governing Mg 2+ transportation, resulting in a substantial energy barrier impeding its transport. Furthermore, a two-stage nanofiltration process was employed to enhance Li + enrichment in simulated brine and achieved 35-fold increase in Li + enrichment using as-fabricated membranes. These results demonstrate the substantial potential for Li + extraction from brine with a high Mg 2+ /Li + mass ratio using the crown ether incorporated membrane. Meanwhile, the proposed strategy incorporating transport barriers presents a novel approach for designing ion-selective channels within membranes.
研究领域:
材料科学
·
环境工程
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DOI
高影响因子
HYDROMETALLURGY
·
2019
·
IF 3.465
Shuainan Ni,Caibin Wu,Yanliang Wang,Xiangguang Guo,Zeyuan Zhao,Xiaoqi Sun
Softening ammonia sulfate wastewater is one of the vital issues in the rare earth industry. In this article, a novel softening process using [4,4′-isopropylidenebis (phenoxyacetate)] (H 2 IPOAA) for Ca 2+ and Mg 2+ (M 2+ ) is developed. The effect factors, i.e., equilibrium time, pH value of aqueous phase and saponification degree are investigated. The extraction mechanism is proposed to be cation exchange. With a saponification degree of 85%, H 2 IPOAA is successfully used for the precipitation of Ca 2+ and Mg 2+ from ammonia sulfate wastewater within 10 min. The process can form precipitated particles with an average size of 35 μm, which are much larger than the precipitates formed by H 2 C 2 O 4 , Na 2 C 2 O 4 and Na 2 CO 3 . The precipitated particles can be easily separated from the raffinate. In addition, H 2 IPOAA is repeatedly used for five times with a little loss. To a considerable extent, the reuse of H 2 IPOAA contributes to lowering the cost and reducing the pollution. The concentrations of Ca 2+ and Mg 2+ in the raffinate extracted by H 2 IPOAA are up to the MVR standard for wastewater treatment . The economical and efficient softening process meets the need of green chemistry, which is expected to replace traditional industrial processes for water softening based on H 2 C 2 O 4 , Na 2 C 2 O 4 and Na 2 CO 3 .
研究领域:
环境科学
·
化学工程
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Wenlei Liu,Jianxing Shen,Qingle Pang,Tailin Wang,Xiujun Han
Cerium-doped yttrium aluminum garnet (YAG:Ce) based transparent ceramics have been widely used in fluorescent lighting as high-quality inorganic fluorescent conversion materials. This paper further explores the Mg 2+ -Si 4+ ions doped YAG:Ce transparent ceramics by combining the solid-phase reaction method with vacuum hot-pressure sintering and implementing protection measures against hot-pressure mold contamination, and also investigates the effect of different Mg 2+ -Si 4+ doping contents on the structure, transmittance and luminescence properties of the ceramics under hot-pressure sintering. In this work, pure-phase YMASG:Ce transparent fluorescent ceramics with a grain size of about 3-6 μm and clear and clean grain boundaries were obtained with an In-line transmittance of 67% at 800 nm. Under the excitation at 460 nm, the emission peak was red-shifted by 26 nm and the full width at half maxima (FWHM) was broadened with the increase of Mg 2+ -Si 4+ content, which shows that the Mg 2+ -Si 4+ ion pair effectively complements the absence of the red light component in the YAG:Ce emission spectrum. The optimized YMASG:Ce ceramics obtained high-quality warm white light with a low correlated color temperature (CCT) and a high color rendering index (CRI) under the excitation of the blue LED chip. This work proved the feasibility of vacuum hot-pressure sintering to prepare YMASG:Ce transparent fluorescent ceramics, and provided a new approach for studying YMASG:Ce-based ceramics, which was significant for the application of high-power visible laser illumination.
研究领域:
材料科学
·
光学工程
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DOI
高影响因子
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
·
2026
·Vol. 74
·期 29
·23140-23154
·
IF 6.7
Guo Qiyong,Cao Weihang,Chen Ling
Conventional magnesium supplementation relies on passive
diffusion
in the small intestine, resulting in poor bioavailability. To address
this, we developed an oxidized starch-chitosan-Mg 2+ composite
gel that directs more Mg 2+ to the colon, where resistant
polysaccharides are fermented to SCFAs that may actively enhance absorption.
Mg 2+ incorporation increased the gel’s resistant
component to 52.42 ± 0.63%. Increasing Mg 2+ from 0.5%
to 2% reduced cumulative upper gastrointestinal release from 70.61
± 0.79% to 43.62 ± 1.01% ( p < 0.05),
with higher concentrations showing no further improvement. In Mg 2+ -deficient mice, the gel dose-dependently restored serum
Mg 2+ to healthy levels. Comparison at equal Mg 2+ doses revealed that the polysaccharide carrier independently contributed
to enhanced absorption. Mechanistically, resistant polysaccharides
were associated with upregulation of SCFAs receptors (FFAR2/FFAR3/HCAR2)
and Mg 2+ transporters (TRPM6/TRPM7/CNNM4), with immunofluorescence
indicating TRPM7 upregulation. This work provides proof-of-concept
evidence for a paradigm shift from passive supplementation to active
regulation via SCFAs-associated transporter modulation.
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DOI
PubMed
高影响因子
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
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DOI
高影响因子
JOURNAL OF ELECTRONIC MATERIALS
·
2022
·Vol. 51
·期 7
·3896-3902
·
IF 2.047
Cheng Jiawen,Qing Zhenjun,Wang Jin,Zhao Yun,Zhou Xin,Zou Huapeng,Li Haiyan,Li Yingxiang
In this paper, the traditional solid-phase reaction sintering process was used to synthesize Ca 1-x Mg x V 2 O 6 (x = 0.03, 0.06, 0.09, 0.12) ceramics under low-temperature conditions. The effects of partial replacement of Ca 2+ by Mg 2+ on the A-site on the crystalline type, sintering temperature, microstructure, densification, and microwave dielectric performances of Ca 1-x Mg x V 2 O 6 ceramic were studied. The only crystalline phase of CaV 2 O 6 was observed in the ceramics. The sintering densification and dielectric performances of the Ca 1-x Mg x V 2 O 6 ceramic show a trend of first increasing and then decreasing with the increase of Mg 2+ content. The addition of Mg ions can effectively increase the Q × f value of the Ca 1-x Mg x V 2 O 6 ceramics but cannot improve the τ f value. The Ca 0.91 Mg 0.09 V 2 O 6 ceramic sintered at 725°C displayed good microwave dielectric performances: ε r = 10.41, Q × f = 68524 GHz, and τ f = − 36.8 ppm/°C. The good dielectric properties of this ceramic can meet the development needs of 5G communication technologies.
研究领域:
材料科学
·
电子工程
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DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2025
·
IF 9
Haisong Zhao,Lei Zhang,Hongsen Hui,Hongchang Pei,Xianhui Li
Nanofiltration (NF) membrane with high ion sieving efficiency is desired for Mg 2+ /Li + separation. To achieve this aim, a crown ether functional layer with a high Mg 2+ transportation barrier was constructed by grafting water-soluble diazo-18-crown-6 ether (DA18C6) monomer on the piperazine (PIP)-based polyamide NF membrane surface via secondary interfacial polymerization (SIP). Molecular simulations revealed that the crown ether monomer has a stronger interaction force with Mg 2+ (−355.9 kcal/mol) than Li + (−110.6 kcal/mol) due to its higher bonding energy, thereby reducing the diffusion rate of Mg 2+ . The ion separation experiment showed that the PIP-TMC-DA18C6 (5min) NF membrane demonstrated a better Mg 2+ rejection of 87.7 % compared with the pristine PIP-TMC NF membrane of 76.1 %. Besides, the Li + shows a higher mean square displacement (MSD) value in PIP-TMC-DA18C6 NF membrane than PIP-TMC NF membrane, resulting in a lower Li + rejection of 34.1 %. Furthermore, the PIP-TMC-DA18C6 (5 min) NF membrane also shows an excellent separation factor of 18 under the Mg 2+ /Li + ratio of 50:1. This work demonstrated that the crown ether-based composite NF membrane exhibits a good performance for Mg 2+ /Li + separation.
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DOI
高影响因子
DESALINATION
·
2017
·
IF 5.527
Hai-Zhen Zhang,Zhen-Liang Xu,Hao Ding,Yong-Jian Tang
High water permeability and good separation property are greatly desired in water production due to energy concerns. To explore nanofiltration (NF) membrane with high permeability for cations separation, a positively charged NF membrane was fabricated via interfacial polymerization using polyethersulfone (PES) three-channel capillary ultrafiltration (UF) membrane as substrate, polyethyleneimine (PEI) as the aqueous precursor. The NF membrane preparation conditions were optimized. To enhance the permeability of the prepared NF membrane, modified hydroxyl contained multi-walled carbon nanotubes (MWCNTs-OH), grafting with piperazine (PIP), were utilized. The resultant NF membrane showed increased water flux from 20.8 L·m − 2 ·h − 1 to 56.1 L·m − 2 ·h − 1 at 4 bar after adding 0.01 wt% modified MWCNTs-OH in aqueous solution. Interestingly, MgCl 2 rejection of the membrane also increased from 94.2% to 96.9%. The positively charged NF membrane exhibited above 97% rejection for divalent cations (Mg 2 + and Ca 2 + ) and low rejection (< 70%) for monovalent cations (Na + and Li + ), and it also showed long durability and good separation for Mg 2 + and Li + when the membrane was used to separate mixed salts solution simulated the composition of salt lake brine. The fabricated membrane would have potential for effective water softening and for reclamation of lithium from brine or seawater with high Mg 2 + /Li + ratio.
研究领域:
环境科学
·
材料科学
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DOI
高影响因子
ANALYST
·
2013
·Vol. 138
·期 10
·3046-3052
·
IF 3.969
Xuming Zhuang,Dalei Wang,Lifen Yang,Ping Yu,Wei Jiang,Lanqun Mao
Simple and effective measurement of Mg2+ in the brain of living animals is of great physiological and pathological importance. In this study, we report a facile yet highly selective colorimetric method for effective sensing of cerebral Mg2+. The method is based on rational design of surface chemistry of gold nanoparticles (Au-NPs) with functional molecules including 1,4-dithiothreitol (DTT) and cysteine, enabling the fine tuning of the surface chemistry of Au-NPs in such a way that the addition of Mg2+ into the Au-NPs dispersion could selectively trigger the change of the dispersion/aggregation states of Au-NPs. The strong chelation interaction between Mg2+ and the hydroxyls in 1,4-dithiothreitol and the co-existence of cysteine on the surface of Au-NPs could, on one hand, enable the selective colorimetric detection of Mg2+ and, on the other hand, avoid the aggregation of Au-NPs induced by DTT itself. As a result, the addition of Mg2+ into the dispersion of the Au-NPs containing both cysteine and DTT results in the changes in both the color and the UV-vis spectra of the Au-NPs dispersion. The signal readout shows a linear relationship of Mg2+ within the concentration range from 1 μM to 40 μM with a detection limit of 800 nM (S/N = 3). Moreover, the assay demonstrated here is free from the interference of some physiological species commonly existing in rat brain. Although Ca2+ could interfere with the detection of Mg2+ because of its strong chelation with DTT, it could be selectively masked by masking agent (i.e., ethyleneglcol-bis (2-aminoethylether) tetraacetic acid). By combining the microdialysis technique, the basal dialysate level of Mg2+ is determined to be 299.2 ± 41.1 μM (n = 3) in the cerebral systems. The method essentially offers a new method for the detection of Mg2+ in the cerebral system.
研究领域:
神经化学
·
分析化学
·
纳米生物技术
·
分子探针
·
金属离子传感
·
活体分析
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Li Wang,Danyal Rehman,Peng-Fei Sun,Akshay Deshmukh,Liyuan Zhang,Qi Han,Zhe Yang,Zhongying Wang,Hee-Deung Park,John H. Lienhard,Chuyang Y. Tang
Nanofiltration (NF) with high water flux and precise separation performance with high Li+/Mg2+ selectivity is ideal for lithium brine recovery. However, conventional polyamide-based commercial NF membranes are ineffective in lithium recovery processes due to their undesired Li+/Mg2+ selectivity. In addition, they are constrained by the water permeance selectivity trade-off, which means that a highly permeable membrane often has lower selectivity. In this study, we developed a novel nonpolyamide NF membrane based on metal-coordinated structure, which exhibits simultaneously improved water permeance and Li+/Mg2+ selectivity. Specifically, the optimized Cu–m-phenylenediamine (MPD) membrane demonstrated a high water permeance of 16.2 ± 2.7 LMH/bar and a high Li+/Mg2+ selectivity of 8.0 ± 1.0, which surpassed the trade-off of permeance selectivity. Meanwhile, the existence of copper in the Cu–MPD membrane further enhanced anti-biofouling property and the metal-coordinated nanofiltration membrane possesses a pH-responsive property. Finally, a transport model based on the Nernst–Planck equations has been developed to fit the water flux and rejection of uncharged solutes to the experiments conducted. The model had a deviation below 2% for all experiments performed and suggested an average pore radius of 1.25 nm with a porosity of 21% for the Cu–MPD membrane. Overall, our study provides an exciting approach for fabricating a nonpolyamide high-performance nanofiltration membrane in the context of lithium recovery.
研究领域:
材料科学
·
环境工程
·
化学工程
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DOI
高影响因子
MATERIALS SCIENCE FORUM
·
2011
·
IF 0
Jun Zhang,Xiao Ting Shi,Wei Guo,Zhong Zhang,Hong Yang
The structural transition of DNA double-stranded induced by Ce3+ or Mg2+ ions was investigated in this paper. By atomic force microscopy, different types of condensed DNA structures were observed at the presence of Ce3+ or Mg2+ ions. The results show that there are some differences between rare earth ions and alkaline earth metal ions in the DNA condensation process.
研究领域:
生物化学
·
分子生物学
·
纳米技术
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DOI
JOURNAL OF MEMBRANE SCIENCE
·
2025
·
IF 9
Le Shi,Li Ding,Sihua Liu,Haifu Gao,Jingguo She,Jianhua Zhang,Xiaolong Lu,Chunrui Wu
To achieve efficient separation of Li + /Mg 2+ , nanofiltration membranes (NFMs) with intensified positive charge density were fabricated by surface grafting of guanazole (GAZ) on the surface of piperazine (PIP)/trimesoyl chloride (TMC) NFMs. GAZ is rich in amino groups with smaller molecular size, could contact and react more sufficiently with reaction sites on membrane surface, and give less potential blockage of surface pores, compared to traditional surface grafting molecules. The influence of the chargeability and pore size of pristine PIP/TMC NFMs and surface grafting reaction on the structure and performance of GAZ grafted NFMs was investigated. Simulated brine with Mg 2+ /Li + ratio of 150 was utilized to evaluate the feasibility of GAZ grafted NFMs in treating salt-lake brine with high Mg 2+ /Li + ratios. The results showed that the positive charge density on the NFMs surface was improved and the percentage of larger pores was reduced with the successful grafting of GAZ. The optimal GAZ grafted NFMs exhibited higher MgCl 2 rejection (94.2%) than that of PIP/TMC NFMs (64.2%) and maintained a stable pure water permeance. It was worth noting that the Li + /Mg 2+ separation factor for simulated brine of 2000 mg·L -1 (Mg 2+ /Li + ratio of 150) reached 25.7, which was potentially applicable for treating salt-lake brine with high Mg 2+ /Li + ratios.
研究领域:
材料科学
·
环境工程
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DOI
高影响因子
危险品化学品经营许可证（带存储）