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Preparation and characterization of PVDF flat-sheet membranes for direct contact membrane distillation
Hou, Deyin; Fan, Hua; Jiang, Qinliang; Wang, Jun; Zhang, Xiaohui
2014
Source PublicationSEPARATION AND PURIFICATION TECHNOLOGY
ISSN1383-5866
Volume135Issue:1Pages:211-222
AbstractThe polyvinylidene fluoride (PVDF) flat-sheet membranes for direct contact membrane distillation (DCMD) were prepared through coating and wet phase inversion process. The effects of solvent, polymer concentration, non-solvent additive and nonwoven fabric on membrane morphology, porosity, pore size, pore size distribution, hydrophobicity and permeability were investigated. It was found that the membrane using N,N-dimethylacetamide as solvent obtained good permeability, and the polymer dope containing 20 wt.% PVDF was the most suitable for hydrophobic flat-sheet membrane preparation. The PVDF flat-sheet membranes with different non-solvent additive such as acetone, phosphoric acid, glycerine, LiCl and PEG 400 were prepared and the membrane using 5 wt.% acetone and 3 wt.% H3PO4 as mixed additive had the highest permeate flux. The nonwoven fabric could prevent membrane shrinkage, while both pore size and permeate flux of the PVDF/nonwoven fabric composite membrane were enhanced. Although the nonwoven fabric caused the membrane surface roughness decline, the contact angle only decreased slightly. The PVDF/nonwoven fabric composite membrane exhibited satisfying performance stability during the 240 h continuous desalination experiments, indicating that the resultant flat-sheet membrane may be of great potential to be utilized in DCMD process for desalination. (C) 2014 Elsevier B.V. All rights reserved.
Department环境水质学国家重点实验室
KeywordMembrane Distillation Polyvinylidene Fluoride Flat-sheet Membrane Desalination Hydrophobicity
Citation statistics
Document Type期刊论文
Identifierhttps://ir.rcees.ac.cn/handle/311016/9586
Collection环境水质学国家重点实验室
Recommended Citation
GB/T 7714
Hou, Deyin,Fan, Hua,Jiang, Qinliang,et al. Preparation and characterization of PVDF flat-sheet membranes for direct contact membrane distillation[J]. SEPARATION AND PURIFICATION TECHNOLOGY,2014,135(1):211-222.
APA Hou, Deyin,Fan, Hua,Jiang, Qinliang,Wang, Jun,&Zhang, Xiaohui.(2014).Preparation and characterization of PVDF flat-sheet membranes for direct contact membrane distillation.SEPARATION AND PURIFICATION TECHNOLOGY,135(1),211-222.
MLA Hou, Deyin,et al."Preparation and characterization of PVDF flat-sheet membranes for direct contact membrane distillation".SEPARATION AND PURIFICATION TECHNOLOGY 135.1(2014):211-222.
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