Facile formation of symmetric microporous PVDF membranes via vapor-induced phase separation of metastable dopes
學年 110
學期 2
出版（發表）日期 2022-02-05
作品名稱 Facile formation of symmetric microporous PVDF membranes via vapor-induced phase separation of metastable dopes
作品名稱（其他語言）
著者 Jenn Fang Su; Konstantinos G. Beltsios; Ping-Hong Li; Liao-Ping Cheng
單位
出版者
著錄名稱、卷期、頁數 Colloids and Surfaces A: Physicochemical and Engineering Aspects 634, 128012
摘要 Symmetric microporous PVDF membranes were prepared from the ternary system water/triethyl phosphate/PVDF, by a vapor induced phase separation scheme (VIPS) that employed a non-solvent additive (i.e. water) in the dope to facilitate phase inversion. Incorporation of water into the dope generates a metastable system and induces precipitation even upon limited vapor-exposure at ambient conditions. Additionally, the resulted membranes exhibit a special bi-continuous bulk structure comprising interlinked crystallites with three-dimensionally porous networks. Moreover, the structure of top surface can be controlled by the duration of vapor exposure and ranges from a dense (nonporous) skin to an open top over the period of 0–8 min. Optimally, a symmetric microporous membrane with high hydrophobicity (CA = 119°), large porosity (84.5%) and submicron pore size (0.36 µm) appropriate for membrane distillation in desalination applications is obtained. In actual practice, this membrane could yield nearly pure water at the rate of 17.2 LMH from a 3.5% NaCl(aq) feed by direct contact membrane distillation operated at a temperature difference (ΔThot-cold) of 30 °C.
關鍵字 Membranes;PVDF;Bi-continuous structure;Vapor induced phase separation;Membrane distillation
語言 en
ISSN 0927-7757
期刊性質 國外
收錄於 SCI
產學合作
通訊作者
審稿制度 是
國別 NLD
公開徵稿
出版型式 ,電子版
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機構典藏連結 ( http://tkuir.lib.tku.edu.tw:8080/dspace/handle/987654321/122540 )