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30 results on '"Sheng, Fangmeng"'

11. Scalable and interfacial gap‐free mixed matrix membranes for efficient anion separation.

Author

Xu, Tingting, Wang, Yue, Chen, Qian, Zhu, Yanran, Li, Wenmin, Sheng, Fangmeng, Ge, Liang, Li, Xingya, and Xu, Tongwen

Subjects
CONDUCTING polymers, ANIONS, INDUSTRIAL capacity, METAL-organic frameworks, POLYMERS, ELECTRODIALYSIS
Abstract

Mixed matrix membranes (MMMs) are promising in ion separation due to the simple preparation process. However, traditional metal–organic framework and covalent organic framework fillers lack the solution processibility and show interfacial defects between polymer matrixes and fillers, resulting in unsatisfactory separation performance. Herein, a soluble porous organic cage (POC) (i.e., CC3) is used as the filler to fabricate a large scale (~2000 cm2) and interfacial gap‐free ionic polymer (HPABP)‐CC3 membrane by a facile co‐solvent casting and rapid crystallization method. The resultant HPABP‐CC3(15) membrane shows a high Cl− flux of 2.24 mol m−2 h−1 and a Cl−/SO42− selectivity of 12.67, which is 3.6 and 3.0 times that of the HPABP membrane, respectively. Moreover, the HPABP‐CC3 membranes possess excellent cyclic and long‐term stability during the electrodialysis process. Therefore, we provide a facile strategy to scale up POC MMMs with synergistically enhanced ion flux and selectivity and the possibility for potential industrial ion separations. [ABSTRACT FROM AUTHOR]

Published
2024
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14. Highly stable two-dimensional AgCrSe2membranes reinforced by polydopamine for contaminated water purification

Author

Wang, Yue, Su, Yueqi, Zhang, Hao, Li, Wenmin, Sheng, Fangmeng, Xu, Tingting, Li, Xingya, Wu, Changzheng, and Xu, Tongwen

Abstract

Two-dimensional (2D) nanosheet membranes exhibit significant potential for molecular and ionic separation. Nonetheless, these membranes encounter swelling and oxidation issues when applied for the wastewater treatment in real-world scenarios. Herein, we report a novel approach to fabricate highly stable 2D membranes using AgCrSe2nanosheets reinforced through the in-situpolydopamine (PDA) crosslinking. These AgCrSe2-PDA membranes exhibit outstanding resistance to both acidic and alkaline conditions, as well as to oxidizing agents (e.g., 0.3 wt% H2O2), thereby demonstrating superior anti-swelling and anti-oxidation capabilities. The membranes achieve nearly 100% rejection rates for negatively charged dyes and heavy metal ions complexed with ethylene diamine tetraacetic acid (EDTA), with a permeance of approximately 5.0 L m−2h−1bar−1. Notably, the membrane maintains about 90% rejection efficiency for Cu-EDTA, with only a marginal decrease in flux, even after 140 h of cross-flow filtration. The robustness of the membrane is primarily attributed to the coordination interactions between PDA and the AgCrSe2nanosheets. This study offers an innovative strategy for the development of stable 2D membranes, thereby extending their applicability in the treatment of industrially contaminated water.

Published
2024
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19. 3D‐Zipped Interface: In Situ Covalent‐Locking for High Performance of Anion Exchange Membrane Fuel Cells

Author

Liang, Xian, primary, Ge, Xiaolin, additional, He, Yubin, additional, Xu, Mai, additional, Shehzad, Muhammad A., additional, Sheng, Fangmeng, additional, Bance‐Soualhi, Rachida, additional, Zhang, Jianjun, additional, Yu, Weisheng, additional, Ge, Zijuan, additional, Wei, Chengpeng, additional, Song, Wanjie, additional, Peng, Jinlan, additional, Varcoe, John R., additional, Wu, Liang, additional, and Xu, Tongwen, additional

Published
2021
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21. Insight into Ion Transport in Discrete Frameworks of Porous Organic Cage Membranes

Author

Xu, Tingting, Wu, Bin, Li, Yifan, Zhu, Yanran, Sheng, Fangmeng, Ge, Liang, Li, Xingya, and Xu, Tongwen

Abstract

Porous organic cages (POCs) of discrete frameworks are promising candidates for separation membranes of high ion permeability and selectivity. Here, we investigate the ion transport properties of POC (i.e., CC1, CC3, and CC19) membranes with different cage arrangements, channel wettabilities, and surface charges. Compared to CC1, the window-to-window alignment of CC3 membranes leads to continuous channels with the window-cavity structure and guarantees a high ion permeability and ion selectivity. In comparison with CC19, the hydrophobic channels of CC3 membranes suppress the hydrogen-bonding interaction between hydrated ions and the channel wall, facilitating fast ion transport. Tuning the surface charge of CC3 membranes from the negative to positive state, the mono-/divalent cation selectivity increases obviously due to the enhanced electrostatic repulsion toward divalent cations. This work reveals ion transport behaviors in POCs with various channel configurations and surface chemistries, offering guidelines for the construction of efficient ion separation membranes.

Published
2023
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24. Sulfonated Microporous Polymer Membranes with Fast and Selective Ion Transport for Electrochemical Energy Conversion and Storage

Author

Zuo, Peipei, primary, Li, Yuanyuan, additional, Wang, Anqi, additional, Tan, Rui, additional, Liu, Yahua, additional, Liang, Xian, additional, Sheng, Fangmeng, additional, Tang, Gonggen, additional, Ge, Liang, additional, Wu, Liang, additional, Song, Qilei, additional, McKeown, Neil B., additional, Yang, Zhengjin, additional, and Xu, Tongwen, additional

Published
2020
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30. Sulfonated Microporous Polymer Membranes with Fast and Selective Ion Transport for Electrochemical Energy Conversion and Storage.

Author

Zuo P, Li Y, Wang A, Tan R, Liu Y, Liang X, Sheng F, Tang G, Ge L, Wu L, Song Q, McKeown NB, Yang Z, and Xu T

Abstract

Membranes which allow fast and selective transport of protons and cations are required for a wide range of electrochemical energy conversion and storage devices, such as proton-exchange membrane (PEM) fuel cells (PEMFCs) and redox flow batteries (RFBs). Herein we report a new approach to designing solution-processable ion-selective polymer membranes with both intrinsic microporosity and ion-conductive functionality. Polymers are synthesized with rigid and contorted backbones, which incorporate hydrophobic fluorinated and hydrophilic sulfonic acid functional groups, to produce membranes with negatively charged subnanometer-sized confined ionic channels. The ready transport of protons and cations through these membranes, and the high selectivity towards nanometer-sized redox-active molecules, enable efficient and stable operation of an aqueous alkaline quinone redox flow battery and a hydrogen PEM fuel cell., (© 2020 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim.)

Published
2020
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