表面沉积化镁合金基底上超疏水聚偏氟乙烯微孔膜的制备与性能

doi:10.16085/j.issn.1000-6613.2019-1315

化工进展 ›› 2020, Vol. 39 ›› Issue (8): 3177-3182.DOI: 10.16085/j.issn.1000-6613.2019-1315

表面沉积化镁合金基底上超疏水聚偏氟乙烯微孔膜的制备与性能

王志英(), 张海静, 张佩影, 杨振生, 李春利()

河北工业大学化工学院，化工节能过程集成与资源利用国家地方联合工程实验室，天津 300130

出版日期:2020-08-01 发布日期:2020-08-12
通讯作者: 李春利
作者简介:王志英（1977—），女，博士，副教授，主要从事膜科学与技术研究。E-mail：ctstwzy@163.com。
基金资助:
河北省高等学校科学技术研究重点项目(ZD2015107)

Preparation and properties of super-hydrophobic polyvinylidene fluoride microporous membrane supported on deposited magnesium alloy

Zhiying WANG(), Haijing ZHANG, Peiying ZHANG, Zhensheng YANG, Chunli LI()

National-Local Joint Engineering Laboratory for Energy Conservation in Chemical Process Integration and Resources Utilization, School of Chemical Engineering and Technology, Hebei University of Technology, Tianjin 300130, China

Online:2020-08-01 Published:2020-08-12
Contact: Chunli LI

摘要/Abstract

摘要：

用一步浸泡法制得表面沉积化镁合金板，再以此镁合金板为制膜基底，以聚偏氟乙烯（PVDF）/N,N-二甲基乙酰胺（DMAc）/辛醇/水为制膜体系，采用干-湿相转化法制备了超疏水PVDF膜，该膜的水接触角可达160°。用粗糙度仪、扫描电镜、能谱仪、红外光谱仪等对镁合金表面和PVDF膜底面的微观结构、化学组成进行表征和分析。研究表明，一步浸泡处理过的镁合金表面生成了均匀的十四酸铁沉积物，该沉积物可在膜制备中部分嵌入膜底面，增加了膜底面的粗糙度，从而使PVDF膜的疏水性大幅提高。对PVDF膜的磨损试验表明，所制备的超疏水膜表面具备良好的机械稳定性。真空膜蒸馏实验表明，所制备的PVDF膜具有较高的通量和截留率，在运行中保持了更好的操作稳定性。

关键词: 膜, 聚偏氟乙烯, 超疏水, 镁合金, 沉积物, 磨损, 稳定性

Abstract:

Magnesium alloy with coarse coating was prepared by one-step immersion method, on which polyvinylidene fluoride (PVDF) membrane was fabricated by dry-wet phase inversion in PVDF/dimethylacetamide(DMAc) and octanol/water. The obtained membrane exhibited super-hydrophobicity with a water contact angle up to 160°. Rough-meter，scanning electron microscopy (SEM), energy dispersive spectrometer (EDS) were employed to analyze the structure and compositions of the substrate and membrane surface. It was revealed that a layer of uniform ferrous tetradecanoate was formed on the magnesium alloy substrate, some of which moved to the bottom of the PVDF membrane resulting in the increase of the surface roughness and hence the increase of the hydrophobicity. Attrition tests showed that the super-hydrophobic membrane possessed good mechanical stability as well. When used in vacuum membrane distillation, the membrane showed high permeation and rejection coefficients, and great stability.

Key words: membranes, polyvinylidene fluoride (PVDF), super-hydrophobic, magnesium alloy, deposition, attrition, stability

中图分类号:

TB324

王志英, 张海静, 张佩影, 杨振生, 李春利. 表面沉积化镁合金基底上超疏水聚偏氟乙烯微孔膜的制备与性能[J]. 化工进展, 2020, 39(8): 3177-3182.

Zhiying WANG, Haijing ZHANG, Peiying ZHANG, Zhensheng YANG, Chunli LI. Preparation and properties of super-hydrophobic polyvinylidene fluoride microporous membrane supported on deposited magnesium alloy[J]. Chemical Industry and Engineering Progress, 2020, 39(8): 3177-3182.

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表面沉积化镁合金基底上超疏水聚偏氟乙烯微孔膜的制备与性能

Preparation and properties of super-hydrophobic polyvinylidene fluoride microporous membrane supported on deposited magnesium alloy

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