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用于吸附和测定水溶液中Cr(VI)的静电纺丝阳离子纳米纤维膜：吸附特性和变色机制

Electrospun cationic nanofiber membranes for adsorption and determination of Cr(vi) in aqueous solution: adsorption characteristics and discoloration mechanisms.

作者信息

Fang Run, Shiu Bing-Chiuan, Ye Yuansong, Zhang Yuchi, Xue Hanyu, Lou Ching-Wen, Lin Jia-Horng

机构信息

Department of Material and Chemical Engineering, Minjiang University Fuzhou 350108 China

Fujian Engineering and Research Center of New Chinese Lacquer Materials Fuzhou 350108 China.

出版信息

RSC Adv. 2021 Sep 27;11(50):31795-31806. doi: 10.1039/d1ra05917c. eCollection 2021 Sep 21.

DOI:10.1039/d1ra05917c
PMID:35496856
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9041616/
Abstract

In this study, a novel cationic nanofiber membrane with various functional groups, good structural stability, and high adsorption capacity of Cr(vi) is presented. This nanofiber membrane is prepared by electrospinning a mixed aqueous solution of a cationic polycondensate (CP) and polyvinyl alcohol (PVA). With the aid of PVA, CP can be smoothly electrospun without using any organic solvents, and the cross-linking between CP and PVA improves the stability of membrane in acidic solution. Chemical and morphology characterization reveals that the CP/PVA membrane is composed of interwoven nanofibers that contain numerous cationic groups. Due to its high cationicity and hydrophilicity, the CP/PVA membrane shows great affinity for HCrO and CrO . Adsorption experiments indicate that the CP/PVA membrane can remove Cr(vi) from simulated wastewater rapidly and efficiently in both batch and continuous mode. Besides, the presence of most coexisting ions will not interfere with the adsorption. Due to the redox reaction between the CP/PVA membrane and adsorbed Cr(vi), the CP/PVA membrane exhibits distinct color change after Cr(vi) adsorption and the discoloration is highly dependent on the adsorption amount. Therefore, in addition to serving as a highly efficient adsorbent, the CP/PVA membrane is also expected to be a convenient and low-cost method for semi-quantitative determination of Cr(vi) in wastewater.

摘要

在本研究中，提出了一种具有各种官能团、良好结构稳定性和高六价铬吸附容量的新型阳离子纳米纤维膜。该纳米纤维膜通过静电纺丝阳离子缩聚物（CP）和聚乙烯醇（PVA）的混合水溶液制备而成。借助PVA，CP无需使用任何有机溶剂即可顺利进行静电纺丝，并且CP与PVA之间的交联提高了膜在酸性溶液中的稳定性。化学和形态表征表明，CP/PVA膜由含有大量阳离子基团的交织纳米纤维组成。由于其高阳离子性和亲水性，CP/PVA膜对重铬酸根离子和铬酸根离子表现出极大的亲和力。吸附实验表明，CP/PVA膜能够在间歇和连续模式下快速有效地从模拟废水中去除六价铬。此外，大多数共存离子的存在不会干扰吸附。由于CP/PVA膜与吸附的六价铬之间发生氧化还原反应，CP/PVA膜在吸附六价铬后呈现出明显的颜色变化，且变色程度高度依赖于吸附量。因此，CP/PVA膜除了作为高效吸附剂外，还有望成为一种方便且低成本的废水中六价铬半定量测定方法。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3336/9041616/dfcfd795f440/d1ra05917c-f9.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3336/9041616/cdf7f769023f/d1ra05917c-f1.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3336/9041616/c572f6434ee2/d1ra05917c-f7.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3336/9041616/df3b4a29dbda/d1ra05917c-f8.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3336/9041616/dfcfd795f440/d1ra05917c-f9.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3336/9041616/cdf7f769023f/d1ra05917c-f1.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3336/9041616/0dbce7e28417/d1ra05917c-f2.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3336/9041616/ba5ad2aeb2ca/d1ra05917c-f3.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3336/9041616/3053301dc176/d1ra05917c-f4.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3336/9041616/9e9c9ff67698/d1ra05917c-f5.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3336/9041616/a60c1ce0ffc5/d1ra05917c-f6.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3336/9041616/c572f6434ee2/d1ra05917c-f7.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3336/9041616/df3b4a29dbda/d1ra05917c-f8.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3336/9041616/dfcfd795f440/d1ra05917c-f9.jpg

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