文献类型：期刊文献

英文题名：One-step tailoring surface roughness and surface chemistry to prepare superhydrophobic polyvinylidene fluoride (PVDF) membranes for enhanced membrane distillation performances

作者：Qing, Weihua[1];Wang, Jianqiang[1,3];Ma, Xiaohua[1,2];Yao, Zhikan[1];Feng, Yong[1];Shi, Xiaonan[1];Liu, Fu[3];Wang, Peng[4];Tang, Chuyang Y.[1]

机构：[1]Univ Hong Kong, Dept Civil Engn, Pokfulam, Hong Kong 999077, Peoples R China;[2]East China Univ Sci & Technol, Sch Chem Engn, Shanghai Key Lab Multiphase Mat Chem Engn, 130 Meilong Rd, Shanghai 200237, Peoples R China;[3]Chinese Acad Sci, Ningbo Inst Mat Technol & Engn, Key Lab Marine Mat & Related Technol, Ningbo 315201, Zhejiang, Peoples R China;[4]King Abdullah Univ Sci & Technol, Div Biol & Environm Sci & Engn, Water Desalinat & Reuse Ctr, Thuwal 239556900, Saudi Arabia

年份：2019

卷号：553

起止页码：99

外文期刊名：JOURNAL OF COLLOID AND INTERFACE SCIENCE

收录：;EI(收录号：20192407041897);WOS:【SCI-EXPANDED(收录号:WOS:000483454400011)】；

基金：We thank the financial support from the Office of Sponsored Research, King Abdullah University of Science and Technology (No. OSR-2017-CPF-3320), and partial funding support by Joint Research Scheme (National Natural Science Foundation of China and Research Grants Council of Hong Kong) (N_HKU706/16).

语种：英文

外文关键词：Surface roughness; Surface chemistry; Membrane distillation; Superhydrophobic membrane; Polyvinylidene fluoride

摘要：Superhydrophobic polyvinylidene fluoride (PVDF) membrane is a promising material for membrane distillation. Existing approaches for preparing superhydrophobic PVDF membrane often involve separate manipulation of surface roughness and surface chemistry. Here we report a one-step approach to simultaneously manipulate both the surface roughness and surface chemistry of PVDF nanofibrous membranes for enhanced direct-contact membrane distillation (DCMD) performances. The manipulation was realized in a unique solvent-thermal treatment process, during which a treatment solution containing alcohols was involved. We demonstrate that by using different chain-length alcohols in the treatment solvent, surface roughness can be promoted by creating nanofin structures on the PVDF nanofibers using an alcohol which has moderate affinity with PVDF. Meanwhile, surface chemistry can be tuned by adjusting the fraction distribution of crystal phases (nonpolar alpha phase and polar beta phase) in the membrane using different alcohols. PVDF membranes with different surface wettabilities were used to evaluate the effects of surface roughness and surface energy on the DCMD performances. Combining both low surface energy and multi-scale surface roughness, pentanol-treated PVDF membrane achieved best anti-water property (water contact angle of 164.1 degrees and sliding angle of 8.1 degrees), and exhibited superior water flux and enhanced anti-wetting ability to low-surface-tension feed in the DCMD application. (C) 2019 Elsevier Inc. All rights reserved.