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论文类型：期刊论文

发表时间：2019-05-01

发表刊物：SEPARATION AND PURIFICATION TECHNOLOGY

收录刊物：EI、SCIE、CPCI-S

卷号：214

期号：,SI

页面范围：11-20

ISSN号：1383-5866

关键字：Membrane distillation; Superhydrophobic membrane; Antifouling; Nucleation; Water treatment

摘要：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.