化工进展 ›› 2022, Vol. 41 ›› Issue (5): 2713-2721.DOI: 10.16085/j.issn.1000-6613.2021-1238

• 资源与环境化工 • 上一篇    下一篇

PVDF-PFTS/SiO2膜制备及抗混合污染性能

李正(), 牛静东, 何广泽, 张兰河, 张海丰   

  1. 东北电力大学化学工程学院,吉林 吉林 132012
  • 收稿日期:2021-06-11 修回日期:2021-08-11 出版日期:2022-05-05 发布日期:2022-05-24
  • 通讯作者: 李正
  • 作者简介:李正(1979—),男,博士,副教授,硕士生导师,研究方向为环境功能材料。E-mail:lizhenghit@126.com
  • 基金资助:
    吉林省科技发展计划(20180101309JC)

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

LI Zheng(), NIU Jingdong, HE Guangze, ZHANG Lanhe, ZHANG Haifeng   

  1. School of Chemistry Engineering, Northeast Electric Power University, Jilin 132012, Jilin, China
  • Received:2021-06-11 Revised:2021-08-11 Online:2022-05-05 Published:2022-05-24
  • Contact: LI Zheng

摘要:

采用表面接枝技术制备了PVDF-PFTS/SiO2超疏水复合膜,通过扫描电子显微镜(SEM)和红外光谱(FTIR)分析了膜污染前后的表面结构和组成,考察了直接接触式膜蒸馏(DCMD)装置出水电导率和膜通量的变化,利用XDLVO理论分析了PVDF-PFTS/SiO2超疏水复合膜的抗混合污染性能和机理。结果表明:在1H, 1H, 2H, 2H-全氟辛基三氯硅烷(PFTS)和SiO2共同作用下,PVDF-PFTS/SiO2超疏水复合膜表面形成微纳米复合乳突结构,水接触角(WCA)由99°增至155°。与PVDF基膜相比,PVDF-PFTS/SiO2超疏水复合膜对混合污染物具有较好的抗污染性能;连续运行10h,膜通量和截留率分别保持在10.06kg/(m2·h)和99.80%。XDLVO理论分析表明,PVDF-PFTS/SiO2超疏水复合膜表面与污染物之间的作用力由引力转变为斥力是其抗混合污染性能增强的主要原因之一。

关键词: PVDF-PFTS/SiO2膜, 超疏水性, 膜污染, 膜制备, 复合材料

Abstract:

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.

Key words: PVDF-PFTS/SiO2 membrane, superhydrophobicity, membrane fouling, membrane preparation, composite material

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