Contra-Diffusion Synthesis of Nano-ZIF-8 Modified Polyvinylidene Fluoride Membrane and Its Application in Preparation of Nanofiltration Membrane with High Desalination Performance

被引：0
|
作者：
Chang N. [1 ,2 ]
Gao Z. [2 ]
Yang D. [3 ]
Wang H. [1 ,3 ]
机构：
[1] State Key Laboratory of Separation Membranes and Membrane Processes, Tianjin
[2] School of Chemical Engineering and Technology, Tiangong University, Tianjin
[3] School of Environmental Science and Engineering, Tiangong University, Tianjin
来源：
Gaofenzi Cailiao Kexue Yu Gongcheng/Polymeric Materials Science and Engineering | 2021年 / 37卷 / 12期
关键词：
Contra-diffusion; Modification; Nanofiltration; Polyvinylidene fluoride; ZIF-8;
D O I：
10.16865/j.cnki.1000-7555.2021.0311
中图分类号：
学科分类号：
摘要：
In-situ growth of nano-ZIF-8 layers with regular morphology and uniform size were achieved via the contra-diffusion synthesis procedure without adding alkaline additives at a low stoichiometry. The composition, structure and morphology of ZIF-8 modified polyvinylidene fluoride(PVDF) membranes were characterized by field emission scanning electron microscopy (SEM), X-ray diffraction (XRD) and atomic force microscopy (AFM), and the effects of different synthesis conditions on the crystal structure and morphology of ZIF-8 were also investigated. The nanofiltration membrane based on nano-ZIF-8 modified PVDF membrane was prepared via interfacial polymerization. Results show that the uniform, continuous and dense growth of nano-ZIF-8 layers on the surface of PVDF membrane could be achieved with the front-surface of PVDF membrane getting in touch with 2-methylimidazole methanol solution, while the back-surface of PVDF membrane contacts with zinc nitrate aqueous solution. Meanwhile, the uniform growth of nano-ZIF-8 layer improves the interfacial compatibility of polyamide and PVDF membrane, which significantly improves the desalination performance of this modified composite nanofiltration membrane, and the rejection ratios of MgSO4, Na2SO4, NaCl and MgCl2 are 89.84%, 86.11%, 83.07% and 80.01%, respectively. © 2021, Editorial Board of Polymer Materials Science & Engineering. All right reserved.
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页码：30 / 38
页数：8
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