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Structure and property investigation of PVDF/PVA Composite Nanofiltration Membrane prepared by filtration procedure

Authors： HAN Lu，XU-Zhenliang，YANG Hu*

Units： ( Chemical Engineering Research Center，East China University of Science and Technology，Meilong Road No.130，Shanghai 200237，P.R. China)

KeyWords： nanofiltration; surface coating; dye; crosslinking; PVA

ClassificationCode：TQ028

year,volume(issue):pagination： 2018,38(5):69-76

Abstract：

A dense polyvinyl alcohol (PVA) layer was firstly formed on the surface of PVDF membrane by vacuum filtration, then PVA was cross linked by glutaraldehyde (GA). The obtained PVA/PVDF membrane was tested in nanofiltration. SEM images showed PVA penetrated into the cross-section of the support membrane. A dense and flawless PVA skin layer was formed as revealed by AFM and SEM images. The thickness of PVA layer was influenced by the filtration time, pressure and PVA concentration as well. IR spectra and water contact angle proved the hydrophilic surface of the coated membrane. The nanofiltration experiments showed that a thick PVA layer leaded to a high rejection but a low flux. The optimized preparation condition was found to be 10 filtration minutes under -0.1 bar and cross-linking for 10 minutes. The obtained membrane showed the methyl blue rejection about 93.5%, and the water flux of 14 L/(m2·h·bar), which means that PVDF/PVA membrane can be used for dye removal in wastewater.

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AuthorIntro：

第一作者简介：韩璐(1992-)，女，浙江余姚人，硕士生，研究方向为PVDF膜的亲水改性及应用，E-mail：Luhan92ecust@163.com 通信作者，E-mail：hyang@ecust.edu.cn

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