CARBOHYDRATE POLYMERS
·
2023
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IF 11.2
Hongxu Liu,Junhao Xie,Ziyi Hu,Jingxuan Zhao,Ruijia Wang,Yuchao Qi,Shulin Sun
This work obtained separation membranes with UV-cleaning performance by adding TiO 2 -g-CS/CNTs photocatalyst to the PVDF . The positively charged chitosan (CS) and negatively charged carboxylic carbon nanotube (CNTs-COOH) can be self-assembled into the bilayer structure on the surface of TiO 2 particles through electrostatic attraction. The presence of many hydrophilic groups in CS and CNTs-COOH significantly improves the hydrophilicity of TiO 2 -g-CS/CNTs-PVDF membrane, and helps TiO 2 to be uniformly dispersed on the upper surface. TiO 2 -g-CS/CNTs promote the change of pore structure and expand the flux of the modified membrane to 4.5 times that of pure PVDF . Zeta potential demonstrates that the TiO 2 -g-CS particles successfully attracted CNTs in the PVDF matrix, and the membrane surface was still positively charged. Thus, the combined effect of the positively charged TiO 2 -g-CS and the highly adsorbed CNTs enhanced the retention of the contaminants. More importantly, there is a charge transfer between the grafted CS and TiO 2 interface to obtain a broader light absorption band. The excitation carriers provided by CNTs significantly contribute to the photocatalytic performance after transfer between TiO 2 and CS; thus, TiO 2 -g-CS/CNTs-PVDF produces higher photocatalytic activity for dye molecules (degradation rate > 97 %).
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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DOI
PubMed
高影响因子
NANOTECHNOLOGY
·
2025
·Vol. 36
·期 13
·135402
·
IF 2.8
Yao He,Lijing Wang,Sheng Yang,Shaowei Zhang,Hongfang Du,Dandan Cui,Liangxu Lin
In lithium–sulfur batteries (LSBs), the dissolution of lithium polysulfides (LiPSs) triggers the shuttle effect to lose active materials irreversibly, leading to the fast deterioration of electrochemical performance. Rational designs on the separator membrane could mitigate the shuttle effect. However, the development of efficient separators economically remains a challenging task, aggressively limiting the commercial use of LSBs. This work reports the engineering of commercial molybdenum diselenides (MoSe2) flakes to mitigate the shuttle effect of LSBs, by forming rich Se vacancies via a potassium (K) intercalation and de-intercalation reaction. The Se vacancy in MoSex flakes significantly enhances the adsorption capacity of LiPSs and accelerates the Li+ diffusion kinetics, thereby alleviating the shuttle effect and enhancing the energy storage performance. This directly improves the energy storage performance of the LSBs by incorporating the MoSex flakes into the separator membrane, giving a high capacity retention rate of 94.6% at 2 C after 500 cycles, with a reversible specific capacity as high as 452 mAh g−1. This work offers a new strategy for the design and synthesis of vacancy rich transition metal chalcogenides for high-performance LSBs and beyond.
研究领域:
材料科学
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电化学
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DOI
PubMed
高影响因子
DESALINATION
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2025
·
IF 9.8
Zezhen Zhang,Zekun Zhou,Shuman Feng,Lili Wu,Shanjun Gao
Membrane-based separation technologies often face a trade-off between selectivity and permeability, which represents a significant technical challenge in current research. In this study, vacuum-assisted surface deposition technology was utilized to co -deposit piperazine (PIP) and MXene onto a polyvinylidene fluoride (PVDF) microfiltration membrane. This was followed by interfacial polymerization, initiated by trimesoyl chloride (TMC), to form a polyamide (PA) network, resulting in the fabrication of a conductive thin-film nanocomposite membrane (CTFN-2). The results showed that the CTFN-2 membrane had a uniform PIP-TMC/MXene coating with a distinctive wrinkled structure on its surface, contributing to its high permeate flux and solute rejection. The membrane's separation performance was evaluated using a custom-built low-pressure cross-flow conductive membrane setup. The CTFN-2 membrane selectively rejected various ionic dyes under both positive and negative voltages, with an increased rejection rate for inorganic salts as the voltage rose. Notably, after being stored in deionized water for 180 days, the CTFN-2 membrane maintained stable dye separation performance. This research offers a novel approach for developing efficient and controllable separation membrane materials.
研究领域:
材料科学
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环境工程
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DOI
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Dongyin Li,Fuchao Yang,Xuan Shi,Guangyi Tian,Changhui Fu,Yifan Liu,Zhiguang Guo
In recent years, oil pollution and industrial organic pollutants discharge has become a major problem affecting the ecological and human living environment, and the removal of oil in oily wastewater is increasingly urgent, especially for emulsion separation. Therefore, it is crucial to develop efficient oil–water separation membranes with low cost, green sustainability, and ease of operation. Herein, an ingenious spraying hybrid coatings containing ZIF-67 (Zeolitic Imidazolate Framework-67) and polypyrrole (PPy) onto stainless steel mesh (SSM) and polyvinylidene fluoride (PVDF) was proposed. Through solidification and cooperative self-assembly to build rough structures, oil–water separation membranes ZIF-67@PPy SSM and ZIF-67@PPy PVDF have been obtained, which are hydrophilic and oleophilic in air and superoleophobic underwater. Depending on the scenario, on-demand separation of light oil/water mixtures and oil-in-water emulsions can be easily realized. The resulting oil–water separation membranes performed well that the separation efficiency of ZIF-67@PPy SSM can exceed 99.3% for all kinds of light oil/water mixtures, with a water flux of up to 66250 L/(m2·h), and maintains a separation efficiency of 98.5% even after 50 cycles. ZIF-67@PPy PVDF has a separation efficiency of more than 99.4% for various oil-in-water emulsions, and sustains outstanding performance despite undergoing 10 cycles. In addition, ZIF-67@PPy SSM and ZIF-67@PPy PVDF are sustainable in harsh environments, with good mechanical durability and some antimicrobial properties. The coatings prepared in this work that can be used for the separation of light oil/water mixtures and oil-in-water emulsions, and the proposed combination of multiple separation strategies are expected to improve the selectivity, improve efficiency, enhance contamination resistance, and increase accessibility of oil–water separation technologies.
研究领域:
材料科学
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环境科学
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DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
·
2022
·Vol. 46
·期 14
·19357-19367
·
IF 4.672
Jiuqing Liu,Feifei Song,Junying He,Zikun Hong,Qihou Li,Ya Chen,Lishun Bai,Fanli Zeng,Chen Cheng,Zehao Chen
Summary Owing to its unparalleled theoretical energy density, the Li-O 2 batteries are thought to be one of the most promising energy storage systems, but its application is seriously hindered by its potential safety risks arising from the passivation and corrosion of lithium anode. To address these issues, it is an efficient way to develop functionalized separator that could prevent the migration of anions and macromolecules from cathode toward anode. Herein, a novel Nafion-functionalized polyethersulfone (PES)-based ion-permselective separator was prepared by using non-solvent induced phase separation (NIPS) method. The Nafion ensures a better physical strength of the composite separator, and further characterizations show that the obtained composite separator owns good ionic conductivity (0.52 mS cm −1 ), high lithium ion migration number (0.80), and better cyclic stability (120 cycles, 1000 mAh g −1 ). Consequently, the composite separator serves as an excellent candidate to solve the “shuttle effect” of redox mediators (RMs), the assembled Li-O 2 battery with composite separator adding LiI as RMs presents lower charge overpotential and longer cycle stability (170 cycles, 1000 mAh g −1 ).
研究领域:
材料科学
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电化学
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DOI
高影响因子
Advanced Composites and Hybrid Materials
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2021
·Vol. 4
·期 3
·562-573
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IF 5.693
Cheng Xi Quan,Li Songwei,Bao Hongfei,Yang Xiaobin,Li Zhixing,Zhang Yingjie,Wang Kai,Ma Jun,Ullah Asmat,Shao Lu
The lack of highly permeable and selective separation membranes hampers the application of the energy-efficient membrane separation process for water remediation and CO 2 capture in molecular scale. Nanoparticles have been widely applied for tailoring pore structures and surface properties of the molecular separation membranes, thereby enhancing separation performance. However, limited by non-ideal nanoparticle aggregation, it remains a big challenge to fabricate such membranes on a large scale. Herein, we designed a kind of highly dispersed nanoparticles through grafting poly(sodium-p-styrenesulfonate) (PSS) on metal organic frameworks UiO-66 and deployed them for tailoring structure of polyelectrolyte membrane (PEM) for water remediation and Pebax (PEBA) symmetrical membranes for CO 2 capture, respectively. Because of electrostatic interaction, the PSS-grafted-UiO-66 (UiO-66-PSS) demonstrated nearly 100% dispersion in water and had an average particle size around 200 nm. Most interestingly, the introduction of the UiO-66-PSS finely tailored the affinity between membranes and target molecules, and the molecular structure of both PEM and PEBA membranes, thereby tripling the permeances of the membranes and slightly improving the selectivity of the membranes meanwhile. The PEM/UiO-66-PSS membranes demonstrated pure water permeance as high as 27.3 L m −2 h −1 bar −1 with MgSO 4 rejection above 98.7%. For CO 2 capture, the PEBA/UiO-66-PSS membranes exhibited 414.5 barrer with selectivity about 53.8. Taken together, the highly dispersed UiO-66-PSS shows strong promise in constructing molecular separation membranes with high separation performance for environmental remediation. Graphical abstract The highly dispersed PSS-grafted-UiO-66 finely tailored membrane structures of PEM membranes and the PEBA membranes and enhanced affinity between the target molecules and the aforementioned membranes, thereby tripling membrane permeances and improving the membrane selectivity slightly. The obtained PEM/UiO-66-PSS membranes and PEBA/UiO-66-PSS membranes show strong promise in water remediation and CO 2 capture, respectively.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
APPLIED CLAY SCIENCE
·
2021
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IF 5.467
Guangyong Zeng,Ke Wei,Haiyan Zhang,Jun Zhang,Qingquan Lin,Xiaojie Cheng,Arijit Sengupta,Yu-Hsuan Chiao
The oily wastewater is one of the major waste streams generated due to industrialization. The membrane technology has prominent advantages in the field of oily wastewater treatment . In present investigation, halloysite nanotubes (Hal) and polydopamine (PDA) were utilized to synergistically modify MXene followed by the fabrication of a series of Hal@MXene-PDA two-dimensional (2D) composite membranes by vacuum filtration. Observing the morphology of the membrane and exploring the change in interlayer space by scanning electron microscope (SEM), atomic force microscope (AFM) and X-ray diffraction (XRD), it was confirmed that, the composite membrane was successfully modified. The results revealed that, the Hal@MXene-PDA composite membrane exhibits higher hydrophilicity compared to the virgin membrane. The pure water flux using the composite membrane was found to be 5036.2 L·m −2 ·h −1 ·bar −1 , and the rejections of petroleum ether and lubricating oil were evaluated as 99.8%. The modified membrane(M6) also shows good anti-fouling ability in the anti-fouling cycle test and hence can be considered as a potential candidate for oil-water separation.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
Materials Research Express
·
2024
·Vol. 11
·期 1
·016301
·
IF 1.8
Lei Li,Long Ma,Xin Guo,Xiaoming Li,Tiejun Liu
In order to solve the problems of low cathode conductivity, shuttle effect, and poor electrochemical performance of Li-S batteries, we designed a porous carbon/nano-sized ferric oxide (Fe3O4) composite modified membrane. This improved both conductivity and adsorption capacity of lithium polysulfides (LiPSs) prepared with mesopores and high specific surface area C-Fe3O4@PE. The membrane can bind polysulfide via chemical and physical adsorption. Owing to these advantages, a Li-S battery based on C-Fe3O4@PE and with a separator exhibited excellent rate performance (965.9 mA h g–1 at 0.2 C and 437.5 mA h g–1 at 5 C), as well as a long cycle life (416.6 mA h g–1 after 300 cycles at 0.5 C, with a capacity retention rate of 50.5%).
研究领域:
材料科学
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电化学
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产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2021
·
IF 8.742
Jingwei Lu,Fangchao Li,Gan Miao,Xiao Miao,Guina Ren,Bo Wang,Yuanming Song,Xiangming Li,Xiaotao Zhu
Traditional membrane-based separation methods are limited by the inability of a single membrane to separate both oil/water and oil/oil mixtures. Herein, to address this challenge, we have produced a superhydrophilic/superoleophobic shell powder coating that can be used as an advanced separation membrane for separating oil/water mixtures, emulsions, and oil/oil mixtures, when coated on a copper mesh and fabric. Utilizing its water-affinity and oil-repellency, the separation membrane can separate oil/water mixtures and emulsions with high separation efficiency. Interestingly, our separation membrane displays opposite wetting behavior between high-polar oils and low-polar oils, and utilizing this selective wetting to oils with different polarity, oil/oil mixtures separation is achieved effectively, even if the surface tension difference between two oils is as small as 2.4 mN/m. Using an ethanol-prewetting strategy, on-demand oil/water and oil/oil separation are also achieved on this separation membrane. This study is expected to present a promising approach to membrane-based separation technologies.
研究领域:
材料科学
·
环境工程
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DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2024
·
IF 8.4
Jinyuan Hu,Boru Cai,Yaohui Wang,Zhengran Bian,Tianle Hou,Yanwei Sun
Amorphous metal–organic frameworks (MOFs) present significant potential for achieving high permeability and selectivity in separation applications. However, developing effective fabrication strategies for amorphous MOF membranes with well-defined channels remains a considerable challenge. In this study, amorphous titanium-based MOF membranes with concurrently optimized intercrystalline and intracrystalline selective transport channels were successfully prepared. The resulting membranes exhibited exceptional sieving performance for dyes with molecular weight cutoff of 600 Da. Additionally, defect-rich dual water channels within and between the amorphous MOF aggregates led to a remarkable water permeances up to 107.4 L m −2 h −1 bar −1 , significantly surpassing the benchmarks set by other nanofiltration membranes. This work offers valuable insights into the influence of amorphization on the design of a wide variety of MOF membranes, paving the way for advanced separation applications.
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
JOURNAL OF MEMBRANE SCIENCE
·
2020
·
IF 7.183
Ying Wang,Yuqing Zhang,Jiaqi Wang
To enhance the cleaning efficiency of the ultrafiltration membrane for wastewater, nano spinel CoFe 2 O 4 was synthesized on diatomite via hydrothermal reaction strategy to prepare nano spinel CoFe 2 O 4 deposited diatomite (CF/Dt) particles for activating peroxymonosulfate (PMS), and then used as a functional layer to form CF/Dtcatalytic separation membrane (CF/Dt-M) to remove small and medium molecular pollutants by precise separation and catalytical oxidation . CF/Dt particles and CF/Dt-M were characterized by SEM. The CF/Dt-M was used to deeply clean simulated wastewater containing oil and rhodamine B for investigating its separation and catalytic oxidation performances. The results show that nano spinel CoFe 2 O 4 particles with diameter of 20–100 nm are deposited on the surface of diatomite, and the thickness of CF/Dt-M functional layer is 44 μm. After cleaning simulated wastewater using CF/Dt-M, concentration of oil, RhB and COD in permeate reduces from 57 mg L −1 , 20 mg L −1 , 231 mg·L −1 to 8 mg·L −1 , 0 mg L −1 and 47 mg L −1 , respectively. Water yield of CF/Dt-M is 658 L m −2 h −1 under 0.06 MPa. Nano spinel CoFe 2 O 4 in CF/Dt-M can efficiently activate a small amount of PMS to release a lot of SO 4 •- , making CF/Dt-M perform properties of precise separation and catalytic oxidation. Therefore, CF/Dt-M is a promising candidate extensively applied for cleaning wastewater.
研究领域:
环境科学
·
材料科学
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产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2018
·
IF 6.578
Shasha Zhao,Jiayou Liao,Danfeng Li,Xiaodong Wang,Nanwen Li
The novel gas separation membranes have been prepared by blending highly gas permeable polymer of intrinsic microporosity (PIM-1) and with Tröger's Base polymer (TB). Interestingly, it was found firstly that the PIM-1 polymer was miscible with Tröger's Base polymer in any proportion. It was assumed that the excellent compatibility between two polymers could be attributed to the interaction between CN group in PIM-1 and N atoms in Tröger's Base moieties, as confirmed by ATR-IR results. Thus, flexible, tough and transparent blending membranes (PIM/TB) at different compositions between PIM-1 and TB were obtained by solution casting. The SEM results further confirmed the homogeneous morphology of blending membranes, indicating the excellent compatibility between two polymers. The gas separation performance testing by the volume-constant method suggested that the PIM/TB blending membrane showed lower pure gas permeability but higher ideal permselectivity than that of the pristine PIM-1 membrane, probably due to the lower d-spacing of TB polymers from commercial aromatic diamine which has a rotatable bond as confirmed by XRD results. The highest ideal permselectivity of CO 2 /CH 4 was obtained for PIM/TB (6:4) membranes with CO 2 permeability of 2585Barrer. Moreover, the excellent anti-plasticization ability of CO 2 was observed for the blending membranes. The temperature dependence of gas separation and ideal permselectivity had also been observed for the membranes. The results suggested that the ideal permselectivity, particularly for the CO 2 /N 2 and CO 2 /CH 4 at lower temperature were much higher than that of the membrane at high temperature in spite of the decreasing permeability of CO 2 . The highest ideal permselectivity was achieved as high as 54.3 for CO 2 /N 2 at − 25 ℃ for PIM/TB(8:2) membrane. Thus, the strategy of blending Tröger's Base with PIM-1 showed a promising approach for high performance gas separation membrane.
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）