Omniphobic surface modification of electrospun nanofiber membrane via vapor deposition for enhanced anti-wetting property in membrane distillation

被引：0

作者：

Wu X.-Q. ^{[1
,2
,3
,4
]}

Wu X. ^{[1
,2
,3
,4
]}

Wang T.-Y. ^{[1
,2
]}

Zhao L. ^{[5
]}

Truong Y.B. ^{[3
]}

Ng D. ^{[3
]}

Zheng Y.-M. ^{[1
,2
,4
]}

Xie Z. ^{[3
]}

机构：

[1] CAS Key Laboratory of Urban Pollutant Conversion, Institute of Urban Environment, Chinese Academy of Sciences, 1799 Jimei Road, Xiamen

[2] University of Chinese Academy of Sciences, 19A Yuquan Road, Beijing

[3] CSIRO Manufacturing, Private Bag 10, Clayton, 3168, Victoria

[4] CAS Center for Excellence in Regional Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, 1799 Jimei Road, Xiamen

[5] Shenzhen Key Laboratory of Environmental Chemistry and Ecological Remediation, College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen

来源：

Journal of Membrane Science | 2020年 / 606卷

基金：

中国国家自然科学基金;

关键词：

Anti-wetting; Membrane distillation; Nanofiber membrane; Omniphobic; Vapor deposition;

D O I：

10.1016/j.memsci.2020.118075

中图分类号：

学科分类号：

摘要：

Membrane distillation (MD) is a promising technology for treating saline industrial wastewater, but current hydrophobic MD membranes suffer significant wetting issues due to contaminants commonly present in wastewater. In this study, we report an effective method to fabricate a polyvinylidene fluoride-co-hexafluoropropylene (PVDF-HFP) electrospun nanofiber membrane with improved anti-wetting property against low-surface-tension substances. Without surface activation, the pristine electrospun nanofiber PVDF-HFP membrane with intrinsic re-entrant structure was directly fluorinated by 1H, 1H, 2H, 2H-perfluorodecyltrichlorosilane (FDTS) employing vapor deposition (VD). The fluorinated membrane exhibited excellent surface omniphobicity with high water and ethanol contact angle of 154.1 ± 0.1° and 122.6 ± 1.7°, respectively. The fluorinated membrane showed highly stable omniphobicity and mechanical properties at harsh conditions such as ultrasonic, boiling water, acid and base treatment. More importantly, the resultant omniphobic membrane exhibited robust wetting resistance to the saline feed containing sodium dodecyl sulfate (SDS, 0.4 mM) in an 8-h dynamic direct contact MD (DCMD) test. This study provides an effective and benign approach to fabricate omniphobic nanofiber membranes which have great potential in treating saline wastewater containing low surface tension substances. © 2020 Elsevier B.V.

引用

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