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Indexed by:期刊论文

Date of Publication:2019-05-01

Journal:SEPARATION AND PURIFICATION TECHNOLOGY

Included Journals:EI、SCIE、CPCI-S

Volume:214

Issue:,SI

Page Number:11-20

ISSN No.:1383-5866

Key Words:Membrane distillation; Superhydrophobic membrane; Antifouling; Nucleation; Water treatment

Abstract:In this work, the superhydrophobic polypropylene (PP) composite membranes with modified surface were successfully fabricated by loading the SiO2 nanoparticles and attaching low surface energy 1H,1H,2H,2H-perfluorodecyltriethoxysilane. The impact of deposited nanoparticle size on the surface roughness, heterogeneous nucleation barrier and critical nucleus size versus the loaded nanoparticle size (d(nuclear)(*)/d) was simulated by the model combining the surface roughness and superhydrophobility with the critical nucleation energy. The optimized loaded nanoparticles size maintained the proper roughness and d(nuclear)(*)/d to ensure the desired performance of antifouling. The improved superhydrophobic surface enhanced the anti-wetting ability of the membrane for vacuum membrane distillation (VMD) purpose. The resulting modified membrane possessed good anti wetting ability and stable anti-fouling performance during long-term continuous and batch operation of VMD treating high salinity water system. The fouling rate of the fabricated membrane was decreased to 20% of the one of the original membrane under 15 wt% high salinity feed condition.