POLYMERS AND POLYMER MATRIX COMPOSITES |
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Research Progress on Adsorption Performance of Electrospun Polyacrylonitrile-based Nanofibers for Heavy-metal Ions |
SHI Xiaofeng, MA Yingxia*, LI Xin, KANG Xiaoya, LI Xiaohua, YANG Haijun
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State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals, School of Materials Science & Engineering, Lanzhou University of Technology, Lanzhou 730050, China |
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Abstract Wastewater containing heavy-metal ions poses a serious threat to human health and ecological environment, because heavy-metal ions that have toxicity and bio-accumulative properties are difficult to biodegrade in the environment. Therefore, how to safely and effectively remove heavy-metal ions in wastewater is particularly important. Electrospun polyacrylonitrile (PAN) nanofibers are rich in nitrile groups. Various functional groups, such as sulfhydryl, amino, carboxyl and amidoxime groups, can be introduced into these nanofibers through functional modification to selectively adsorb heavy-metal ions in wastewater. However, as the conversion rate of nitrile groups increases, the flexibility of electrospun PAN nanofibers will worsen, resulting in decrease in mechanical properties, which will affect adsorption properties and practical applications of such nanofibers. Methods of preparing electrospun PAN-based nanofibers through direct functional modification, cross-linking branch modification, polymer blending modification, and organic/inorganic composite modification, are introduced in this paper. The performance of the resulting fibers on adsorbing heavy-metal ions is summarized and compared, and the outlook of future research directions for electrospun PAN-based nanofibers is also provided.
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Received: 25 September 2202
Published: 25 September 2022
Online: 2022-09-26
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Fund:Joint Fund between Shenyang National Laboratory for Materials Science and State Key Laboratory of Advanced Proces sing and Recycling of Nonferrous Metals (18LHPY005). |
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