SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Chao Zhang,Tian Xie,Han Qu,Guofei Li,Zhongyu Zhao,Wanji Zhou,Shiai Xu,Zheng Li
The efficient separation and extraction of Li + from salt lake brines with a high Mg 2+ /Li + ratio remains challenging. Herein, poly(vinyl alcohol-co-ethylene) microcapsules encapsulating tributyl phosphate (TBP) and mono-2-ethylhexyl 2-ethylhexyl phosphate (P507) as carriers were successfully fabricated via one-step phase inversion followed by in situ cross-linking with boric acid. Correspondingly, the obtnined microcapsules possess a fine three-dimensional cross-linked network structure, which can effectively stabilize the extractant carriers and significantly enhance the encapsulation stability. These microcapsules were employed for the stable and selective extraction of Li + from high-Mg 2+ /Li + -ratio brines. The surface morphology, composition, structure, and adsorption characteristics of the TBP–P507 microcapsules were thoroughly investigated. The microcapsules comprising 30 wt% (m/m) polymer matrix and 70 wt% (m/m) TBP–P507 as the extractant (denoted as TBP–P507/P-3) exhibited the highest separation efficiency for Li + and Mg 2+ . The separation factor of Li + over Mg 2+ was up to 427, and the equilibrium adsorption capacity of the TBP–P507/P-3 microcapsules for Li + reached 0.83 mg/g in synthetic brine with a low Li + concentration and a high Mg 2+ /Li + ratio. These results illustrated that Li + could be separated with high selectivity over Mg 2+ . Adsorption kinetics and isotherms investigations indicated that Li + adsorption by TBP–P507/P-3 conformed to the pseudo-second-order kinetic model and was consistent with the Langmuir–Freundlich model, with the mechanism classified as chemisorption. Accordingly, the maximum amount of Li + adsorbed by the TBP–P507/P-3 microcapsules calculated using the Langmuir–Freundlich model was 4.4 mg/g. After 10 adsorption–elution cycles with pure water as the eluent, 96 % of the maximum equilibrium adsorption capacity was retained. The results clearly illustrate the construction of a finely-tuned three-dimensional cross-linked network structure is pivotal to enhancing stability of the microcapsules, efficiently decreasing the risk of carrier leakage from the involved polymer matrixes. Overall, this research presents a valuable microcapsule technology for separating and extracting Li + from high-Mg 2+ /Li + -ratio salt lake brines.
研究领域:
材料科学
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环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2024
·
IF 8.1
Shuting Zhao,Wentao Qi,Chao Yang,Rui Ling
Na 3 V 2 (PO 4 ) 3 has received a lot of attention as a prospective cathode for sodium-ion batteries (SIBs) owing to its strong 3D wide-open architecture for Na + transport. However, the practical application is still hampered by its poor electronic conductivity and weak Na + diffusion kinetics . In this paper, a novel Mg 2+ -doped Na 3 V 2 (PO 4 ) 3 flower-like cathode (Na 3+x V 2-x Mg x (PO 4 ) 3 /C, x = 0, 0.02, 0.04, 0.06) with abundant mesoporous has been synthesized by a convenient template-assisted sol-gel method. Mg 2+ doping successfully triggers V 4+ /V 5+ reversible redox with improved voltage plateau and reversible capacity. The hierarchical mesoporous structure combined with carbon layers is beneficial to the fast transport of Na + and e − , which guarantee improved kinetic properties and enhanced conductivity. Attributed to these competitive advantages, significantly improved electrochemical properties of Na 3.04 V 1.96 Mg 0.04 (PO 4 ) 3 /C (NVMP-4) are acquired, including extremely high specific capacity (123.8 mAh g −1 at 1C), excellent rate performance (73.8 mAh·g −1 at 100C) and exceptionally stable energy output with 89.1 % capacity retention after 3000 cycles at 20C. Additionally, when assembled with a hard carbon anode (HC), NVMP-4||HC provides an exceptional energy density of 216.9 Wh kg −1 at 0.2C. By enhancing nanostructure and rational surface engineering, this project offers fresh perspectives for creating superior electrodes, increasing the energy density of SIBs.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
JOURNAL OF POLYMER RESEARCH
·
2020
·Vol. 27
·期 5
·1-11
·
IF 2.426
Pan Zheng,Lv Yukai,Chen Yulong,Qian Xin
Waterproofing layers play a pivotal role in tunnel engineering and building basements. Magnesium acrylate (CA-Mg 2 ) shot-membrane waterproofing materials- commonly used as a waterproof layer- is a type of hydrogel. Poly(vinyl alcohol) (PVA) solution subjected to freezing/thawing treatment has been added to a CA-Mg 2 monomer, resulting in the formation of a CA-Mg 2 /PVA interpenetrating polymer network (IPN) hydrogel which can produced by a redox initiation system. This new IPN hydrogel contains not only a CA-Mg 2 network formed with Mg 2+ coordination bonds, but also a PVA network created by hydrogen bonding between hydroxyl groups. In comparison to CA-Mg 2 hydrogels, the fracture stress of the CA-Mg 2 /PVA hydrogel increased from 0.45 MPa to 0.72 MPa, elongation from 602% to 854%, and the self-healing efficiency of the IPN hydrogel reached 99.9% over 3 h. A new shot-membrane waterproofing materials based on the CA-Mg 2 /PVA hydrogel was prepared and its fracture stress was 1.44 MPa, and self-healing efficiency 80%, at 3 h. In addition, damage to the hydrogel could be repaired repeatedly.
研究领域:
材料科学
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土木工程
·
化学工程
✓ 已验证
产品关联
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
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环境工程
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Yaru Fan,Hongjing Tian,Kunpeng Wang,Guoli Zhou,Jingtao Wang,Guosheng Li,Yijun Cao,Yingwei Wang,Xiaobin Jiang,Weijie Kou
The demand for lithium resources is increasing globally. Salt lakes have been an important source of lithium exploitation. However, Mg 2+ /Li + separation is a challenge mainly for lithium extraction from salt lakes with high Mg 2+ /Li + ratio. In this paper, a novel monomer QTHEED with bis-quaternary ammonium was designed and synthesized. Composite nanofiltration membranes were also prepared by surface modification of polyamide membranes. The permeance (23.08 L m −2 h −1 MPa −1 ) and Li + /Mg 2+ selectivity (21.7) of modified membranes are both ∼3 times higher than those of the pristine membrane. Increased positive charge of membranes enhances the rejection of Mg 2+ . Furthermore, QTHEED modification brings hydrophilic groups, Turing structure, and larger membrane pores. Simulation results confirmed that the incorporation of the QTHEED enabled the membranes to effectively separate Mg 2+ and Li + and to be more conducive to the passage of water molecules. In addition, the nanofiltration performance of the modified membrane was stable after 40 h of continuous nanofiltration tests at 4 bar pressure. This study presented a novel and efficient approach for separating Mg 2+ and Li + in industrial settings.
研究领域:
材料科学
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环境工程
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of the Taiwan Institute of Chemical Engineers
·
2019
·
IF 3.834
Nan Zhou,Peixing Gao,Yimei Yang,Yuan Zhong,Mao Xia,Ye Zhang,Yun Tian,Xiangyang Lu,Zhi Zhou
In this paper, a series of novel orange-red emission phosphors Sr 8 ZnY(PO 4 ) 7 :Sm 3+ (SZYP:Sm 3+ ) were synthesized by high-temperature solid-state reaction. The photoluminescence and concentration-dependent properties of this phosphor were investigated carefully through diffuse reflection spectra, excitation and emission spectra, Commission Internationale de l'Éclairage (CIE) chromaticity coordinate and decay times. SZYP:Sm 3+ could be efficiently excited by n-UV and blue lights which center at 318, 345, 363, 376, 401, 410, 440 and 475 nm, respectively. The characteristic orange-red emission peaking at 563, 601 and 647 nm had been detected, which should be attributed to the characteristic f – f forbidden transition of Sm 3+ . The internal quantum efficiency (IQE) of ideal phosphor of SZYP:0.09Sm 3+ reached as high as 47%. In addition, The concentration quenching mechanism and thermal stability of SZYP:Sm 3+ were further investigated. It was found SZYP:Sm 3+ can maintain 93% of initial emission intensity at 150 °C and the corresponding activation energy was calculated to be 0.26 eV based on Arrhenius formula. The emission intensity of 1.0Mg 2+ and 0.02Al 3+ incorporated SZYP:0.09Sm 3+ reached up to 134% and 117% of the initial value, respectively. Moreover, (light-emitting diodes) LED devices were fabricated by employing the optimized samples as orange-red component with 365 nm n-UV chips. The desired emission in plant absorption region and extremely high thermal stability imply that SZYP:Sm 3+ is suitable for the application in plant growth LED lighting.
研究领域:
材料科学
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光学工程
·
固体化学
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光电子学
·
农业照明技术
✓ 已验证
DOI
高影响因子
ANALYTICA CHIMICA ACTA
·
2024
·
IF 5.7
Wei Yang,Liang Feng
Background Surface immobilization of DNA is the foundation of a broad range of applications in biosensing and specific DNA extraction. Polydopamine (PDA) coatings can serve as intermediate layers to immobilize amino- or thiol-labelled molecules, including DNA, onto various materials through Michael addition and/or Schiff base reactions. However, the conjugation efficiency is limited by electrostatic repulsion between negatively charged DNA and PDA. Recently, it has been reported that polyvalent metal ions (such as Mg 2+ and Ca 2+ ) can mediate the adsorption of DNA on PDA surfaces. Inspired by this, in this work we aimed to exploit polyvalent metal ions to facilitate the conjugation of DNA on PDA. Results Mg 2+ was used to promote the conjugation of amino-terminated DNA complementary to ochratoxin A (OTA) aptamer (cDNA-NH 2 ) on PDA-coated magnetic nanoparticles (Fe 3 O 4 @PDA). After the reaction, the unlinked cDNA-NH 2 adsorbed on Fe 3 O 4 @PDA mediated by Mg 2+ was removed with EDTA. In the presence of 20 mM Mg 2+ , the amount of covalently linked cDNA-NH 2 increased approximately 11-fold compared to that in the absence of Mg 2+ . The resulting Fe 3 O 4 @PDA@cDNA conjugates exhibited superior hybridization capacity towards OTA aptamers, minimal nonspecific adsorption, and excellent chemical stability. The conjugates combined with fluorophore-labelled aptamers were employed for OTA detection, achieving a limit of detection (LOD) of 2.77 ng mL −1 . To demonstrate versatility, this conjugation method was extended to Ca 2+ -promoted conjugation of cDNA-NH 2 on Fe 3 O 4 @PDA nanoparticles and Mg 2+ -promoted conjugation of cDNA-NH 2 on PDA-coated 96-well plates. Significance The conjugation efficiency of DNA on PDA was significantly improved with the assistance of polyvalent metal ions (Mg 2+ and Ca 2+ ), providing a facile and efficient method for DNA immobilization. Due to the substrate-independent adhesion property of PDA, this method demonstrates versatility in DNA surface modification and holds great potential for applications in target extraction, biosensing, and other fields.
研究领域:
生物传感
·
纳米技术
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分析化学
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材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Chem
·
2019
·
IF 18.205
Yanan Xu,Xuanwei Deng,Qidong Li,Guobin Zhang,Fangyu Xiong,Shuangshuang Tan,Qiulong Wei,Jun Lu,Jiantao Li,Qinyou An,Liqiang Mai
Magnesium-ion batteries (MIBs) show great potential for large-scale energy storage because of the advantages of low cost and safety, but their application is severely hindered by the difficulty in finding desirable electrode materials. Herein, we develop a bilayer-structured vanadium oxide (Mg 0.3 V 2 O 5 ·1.1H 2 O) with synergistic effect of Mg 2+ ions and lattice water as the cathode material for MIBs. The pre-intercalated Mg 2+ ions provide high electronic conductivity and excellent structural stability. The lattice water enables fast Mg 2+ ions mobility because of its charge shielding effect. As a result, the Mg 0.3 V 2 O 5 ·1.1H 2 O exhibits excellent rate performance and an unprecedented cycling life with capacity retention of 80.0% after 10,000 cycles. In addition, the Mg 0.3 V 2 O 5 ·1.1H 2 O exhibits good electrochemical performance in full MIBs. This scalable Mg 2+ host material is a promising candidate as a cathode for MIBs, and its high performance is expected to meet the requirements for large-scale storage applications.
研究领域:
储能
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材料科学
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电化学
·
电池技术
✓ 已验证
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2022
·Vol. 46
·期 11
·5034-5042
·
IF 3.925
Fubin Fu,Xueyan Zhang,Shengquan Zhou,Wei Shi,Jiangmin Li,Jiajia Yu,Yanzhao Rao,Lei Wu,Jing Cao
In this work, we designed two non-salen coumarin Schiff base chiral fluorescent probes 3,3′-((1E,1′E)-(((1,2)-cyclohexane-1,2-diyl)bis(azaneylylidene))bis(methaneylylidene))bis(7-methoxy-2H-chromen-2-one) (L1) and 3,3′-((1E,1′E)-(((1,2)-cyclohexane-1,2-diyl)bis(azaneylylidene))bis-(methaneylylidene))bis(2H-chromen-2-one) (L2), which have outstanding circular dichroic CD signals but almost show no circularly polarized luminescence (CPL) signals. By adding metal ions that can effectively inhibit photo-induced electron transfer (PET), it was observed that L1 can be used as a highly sensitive dual detection ion probe for Mg2+ and Zn2+ as Mg2+ and Zn2+ can turn on the CPL emission of L1. Moreover, (S,S)-L1 has exquisite recognition ability for the enantiomer of the chiral drug D/L-camphorsulfonate and showed reversible fluorescence “on/off” response with Zn2+ and EDTA. It was also found that L2 manifested selective recognition ability for Zn2+.
研究领域:
化学
·
分析化学
·
光学
✓ 已验证
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
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Junyuan Hua,Jintao He,Hongchang Pei,Jiahui Du,Xiaohua Ma,Jianxin Li
The high similarity in chemical properties between Li + and Mg 2+ poses a substantial challenge for their selective separation from salt lake brine with high Mg-Li (m/m) ratios. Herein, a highly efficient solvent extraction system was reported for Li + /Mg 2+ selective separation, with tributyl phosphate (TBP) and di(aminobenzo)-14-crown-4 (CE) as extractants, [C 4 mim][NTf 2 ] (IL) as co-extractant, and methylene chloride as a diluent. Simulated brines included 0.01 M LiCl and 0.01 and 0.2 M MgCl 2 with Mg/Li mass ratios of 3.5 and 70, respectively. Molecular dynamics (MD), density functional theory (DFT), and 1 H NMR analysis were employed to reveal the hydrogen bond interaction and compatibility between CE, TBP, and IL. Under the optimal extraction conditions containing a concentration of 20 mg/mL CE and 0.61 mmol/mL IL, the maximum single-stage Li + extraction rate of the TBP-CE-IL extraction system with Mg/Li mass ratios of 3.5 and 70 were 89.5 and 81.8 %, and the separation factor of Li to Mg were up to 515 and 422. Compared with the TBP-IL extraction system, the addition of CE effectively improved the extraction rate of Li + and the selectivity of Mg-Li, which was due to the hydrogen bond interaction between CE and TBP/IL and the cavity size effect between CE and Li + , improving CE coordination and endowing the complex generated in the organic phase with greater stability. The possible structure of the complex in the organic phase was determined to be 2TBP·Li·NTf 2 -CE·Li·NTf 2 through Li + extraction dynamic analysis. In summary, this work provides an efficient separation technology for Li + extraction from salt lake brine.
研究领域:
化学工程
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材料科学
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环境化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry B
·
2020
·Vol. 9
·期 4
·1096-1106
·
IF 5.344
Min He,Xinhui Gao,Yadi Fan,Li Xie,Mo Yang,Weidong Tian
Instead of directly stimulating osteogenesis, endowing an implant surface with a favourable osteoimmunomodulatory (OIM) function has emerged as a new effective strategy to enhance osteointegration. Though metal-phenolic coatings have demonstrated to possess an immunomodulatory function, their potential application in manipulating an osteoimmune response has not been well explored. Herein, in order to develop a simple, rapid and universal coating method to impart excellent OIM to hard tissue implants, tannic acid (TA) and Mg2+ were selected to form a coating on Ti plate based on metal-phenolic chemistry. Besides its virtues of simplicity, ultrafastness, low-cost, and versatility, another merit for the coating method is that it can easily combine the unique functions of metal ions and phenolic ligands. The chelated Mg2+ can not only activate macrophage polarization towards the anti-inflammatory phenotype but also directly stimulate the osteogenic differentiation of bone marrow-derived stem cells (BMSCs). TA motifs rendered the coating with an excellent reactive oxygen species (ROS) scavenging capacity. TA and Mg2+ showed synergistic effects on regulating macrophage biological behaviour, suppressing its polarization towards the M1 phenotype, and promoting its polarization towards the M2 phenotype. In vivo histological analysis also demonstrated that the TA/Mg2+ coating could effectively inhibit the host response. Finally, the formed osteoimmune environment obviously enhanced the osteogenic differentiation of BMSCs. The above results demonstrated that the designed TA/Mg2+ coating not only possessed the function of directly stimulating osteogenesis but also the function of manipulating OIM to a desired one. Hence, it has great potential to be applied on advanced hard tissue implants to enhance osteointegration.
研究领域:
生物材料
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生物医学工程
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免疫学
·
骨科
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）