Preparation of PVDF-PFTS/SiO2 membrane and its resistance mixed fouling performance

被引：0
|
作者：
Li Z. [1 ]
Niu J. [1 ]
He G. [1 ]
Zhang L. [1 ]
Zhang H. [1 ]
机构：
[1] School of Chemistry Engineering, Northeast Electric Power University, Jilin
来源：
Huagong Jinzhan/Chemical Industry and Engineering Progress | 2022年 / 41卷 / 05期
关键词：
Composite material; Membrane fouling; Membrane preparation; PVDF-PFTS/SiO[!sub]2[!/sub] membrane; Superhydrophobicity;
D O I：
10.16085/j.issn.1000-6613.2021-1238
中图分类号：
学科分类号：
摘要：
The PVDF-PFTS/SiO2 superhydrophobic composite membrane was prepared by surface grafting technology. The surface structure and the composition of the membrane before and after contamination were analyzed by scanning electron microscopy (SEM) and infrared spectroscopy (FTIR). The change of the effluent conductivity and membrane flux of the device in direct contact membrane distillation (DCMD) was investigated. The anti-mixed fouling performance and mechanism of the superhydrophobic PVDF-PFTS/SiO2 superhydrophobic composite membrane were analyzed by XDLVO theory. The results showed that under the combined action of 1H, 1H, 2H, 2H-perfluorooctyltrichlorosilane (PFTS) and SiO2, a micro-nano composite papillary structure was formed on the surface of the PVDF-PFTS/SiO2 superhydrophobic composite membrane. The water contact angle (WCA) increased from 99° to 155°. Compared with the PVDF base membrane, the PVDF-PFTS/SiO2 superhydrophobic composite membrane had a better anti-fouling performance against mixed pollutants. After 10h continuous operation, the membrane flux and rejection rate were maintained at 10.06kg/(m2·h) and 99.80%, respectively. The theoretical analysis of XDLVO showed that the transformation of the force between the surface of the PVDF-PFTS/SiO2 superhydrophobic composite membrane and the pollutants from gravitational force to repulsive force was one of the main reasons for its enhanced anti-mixed fouling performance. © 2022, Editorial Board of CIESC Journal. All right reserved.
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页码：2713 / 2721
页数：8
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