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用于镉离子吸附的碳化Zif-8@PAN纳米纤维膜的制备

Preparation of the Carbonized Zif-8@PAN Nanofiber Membrane for Cadmium Ion Adsorption.

作者信息

Sun Hui, Feng Jiangli, Song Yaoyao, Xu Lei, Cui Xiaogang, Yu Bin

机构信息

College of Textiles Science and Engineering, Zhejiang Sci-Tech University, 928 Second Avenue, Xiasha Higher Education Zone, Hangzhou 310018, China.

School of Textile and Clothing and Art and Media, Suzhou Institute of Trade & Commerce, 287 Xuefu Road, Suzhou 215009, China.

出版信息

Polymers (Basel). 2022 Jun 21;14(13):2523. doi: 10.3390/polym14132523.

DOI:10.3390/polym14132523
PMID:35808568
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9268802/
Abstract

The zeolitic imidazolate framework (ZIF-8)@polyacrylonitrile (PAN) nanofiber membrane was prepared and carbonized for heavy metal cadmium ion (Cd) adsorption in aqueous medium. Zinc oxide (ZnO) was first sputtered onto the surface of the PAN electrospun nanofiber membrane to provide a metal ion source. Then, the ZIF-8@PAN nanofiber membrane was prepared via in situ solvothermal reaction and carbonized in a tube furnace at 900 °C under a N atmosphere to enhance adsorption performance. The synthesized ZIF-8 particles with polyhedral structure were uniformly immobilized on the surface of the PAN electrospun nanofiber membrane. After being heated at 900 °C, the polygonal ZIF-8 shrank, and the carbonized ZIF-8@PAN nanofiber membrane was obtained. Compared with the nanofiber membrane without being carbonized, the adsorption capacity of the carbonized ZIF-8@PAN nanofiber membrane reached 102 mg L, and its Cd adsorption efficiency could be more than 90% under the adsorption temperature of 35 °C and solution of pH = 7.5 conditions. According to the adsorption thermodynamics analysis, the Cd adsorption process of the carbonized ZIF-8@PAN nanofiber membrane was spontaneous. The whole Cd adsorption process was more suitably described by the pseudo second-order adsorption kinetics model, indicating that there exists a chemical adsorption mechanism besides physical adsorption.

摘要

制备了沸石咪唑酯骨架(ZIF-8)@聚丙烯腈(PAN)纳米纤维膜,并将其碳化用于在水介质中吸附重金属镉离子(Cd)。首先将氧化锌(ZnO)溅射在PAN电纺纳米纤维膜表面以提供金属离子源。然后,通过原位溶剂热反应制备ZIF-8@PAN纳米纤维膜,并在管式炉中于900℃、氮气气氛下碳化以提高吸附性能。合成的具有多面体结构的ZIF-8颗粒均匀地固定在PAN电纺纳米纤维膜表面。在900℃加热后,多边形的ZIF-8收缩,得到碳化的ZIF-8@PAN纳米纤维膜。与未碳化的纳米纤维膜相比,碳化的ZIF-8@PAN纳米纤维膜的吸附容量达到102 mg/L,在吸附温度为35℃、溶液pH = 7.5的条件下,其对Cd的吸附效率可超过90%。根据吸附热力学分析,碳化的ZIF-8@PAN纳米纤维膜对Cd的吸附过程是自发的。整个Cd吸附过程更适合用准二级吸附动力学模型来描述,表明除了物理吸附外还存在化学吸附机制。

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