Engineering flat sheet microporous PVDF films for membrane distillation

Title
Engineering flat sheet microporous PVDF films for membrane distillation
Authors
부찬희Siamak NejatiChinedum O. OsujiMenachem Elimelech
Issue Date
2015-10
Publisher
Journal of membrane science
Citation
VOL 492-363
Abstract
A simple phase inversion technique to fabricate hydrophobic microporous films for membrane distillation (MD) is presented. Polyvinylidene fluoride (PVDF) dissolved in triethyl phosphate (TEP) was used as a casting solution with a coagulation bath comprising 2-propanol and water. The effect of processing parameters (PVDF concentration and molecular weight, and composition of coagulation bath) on membrane performance was systematically investigated. Our results demonstrate that an MD membrane with desirable properties can be achieved by carefully controlling the casting parameters. The fabricated membranes exhibited asymmetric structure with a dense top layer and highly porous bottom substrate, and showed markedly different performance (i.e., water vapor flux) depending on the MD membrane orientation. Our results suggest that membrane surface porosity as well as the structure of the membrane are the key factors determining MD membrane performance.
URI
http://pubs.kist.re.kr/handle/201004/72809
ISSN
0376-7388
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KIST Publication > Article
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