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Novel three-dimensional superhydrophobic and strength-enhanced electrospun membranes for long-term membrane distillation
Su, Chunlei1,2; Chang, Junjun1,2; Tang, Kexin1,3; Gao, Fang1,2; Li, Yuping1; Cao, Hongbin1
2017-05-07
Source PublicationSEPARATION AND PURIFICATION TECHNOLOGY
ISSN1383-5866
Volume178Pages:279-287
Abstract

The practical applications of membrane distillation (MD) are hindered by the absence of effective membranes with high porosity, sufficient strength, and durable wetting repellency for long term operation. In this study, we developed a facile method to construct composite membranes with high MD performance via one-step electrospinning of PVDF solutions blended with hydrophobic silica nanoparticles (NPs). The characterizations reveal that the incorporation of silica NPs have altered the membrane surface morphology and endowed the composite membrane with hierarchical structure on both surface and bulk layers (three-dimensional (3D) superhydrophobic membrane). The hydrophobicity of the membranes can be easily tailored by the dosage of silica NPs, and the water contact angle (WCA) of the membranes can be optimized to be 157 1, which was close to that of the lotus leaf (160). Furthermore, the incorporation of silica NPs have promoted the mechanical strength, salt rejection, and water permeation flux of the membranes. The composite membrane containing 7.47 wt% silica NPs (designated as SIL40) can achieve a high MD performance with a water flux of 25.73 kg m(-2)h(-1) and a permeate conductivity below 5.0 mu S cm(-1) during a 100 h test-period. The SIL40 also shows a tensile strength and a Young's modulus of 3.18 and 12.8 MPa, respectively; the values surpassed those of the pristine PVDF membrane (1.5 and 5.4 MPa, respectively). In addition, the MD test indicates that the 3D superhydrophobic membrane exhibits a more durable wetting resistance and a more stable MD performance than the surface modified superhydrophobic membranes. (C) 2017 Elsevier B.V. All rights reserved.

KeywordSuperhydrophobicity Electrospinning Three-dimensional Membrane Distillation Pvdf
SubtypeArticle
WOS HeadingsScience & Technology ; Technology
DOI10.1016/j.seppur.2017.01.050
Indexed BySCI
Language英语
WOS KeywordNanofiber Membranes ; Pvdf Membranes ; Poly(Vinylidene Fluoride) ; Desalination ; Surfaces ; Fabrication ; Water ; Mats ; Meshes
WOS Research AreaEngineering
WOS SubjectEngineering, Chemical
Funding OrganizationNSFC (Natural Science Foundation of China)(21377130 ; 21177130)
WOS IDWOS:000395355400032
Citation statistics
Cited Times:21[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.ipe.ac.cn/handle/122111/22091
Collection湿法冶金清洁生产技术国家工程实验室
Affiliation1.Chinese Acad Sci, Inst Proc Engn, Key Lab Green Proc & Engn, Beijing 100190, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
3.Tianjin Univ, Collaborat Innovat Ctr Chem Sci & Engn, Tianjin 300072, Peoples R China
Recommended Citation
GB/T 7714
Su, Chunlei,Chang, Junjun,Tang, Kexin,et al. Novel three-dimensional superhydrophobic and strength-enhanced electrospun membranes for long-term membrane distillation[J]. SEPARATION AND PURIFICATION TECHNOLOGY,2017,178:279-287.
APA Su, Chunlei,Chang, Junjun,Tang, Kexin,Gao, Fang,Li, Yuping,&Cao, Hongbin.(2017).Novel three-dimensional superhydrophobic and strength-enhanced electrospun membranes for long-term membrane distillation.SEPARATION AND PURIFICATION TECHNOLOGY,178,279-287.
MLA Su, Chunlei,et al."Novel three-dimensional superhydrophobic and strength-enhanced electrospun membranes for long-term membrane distillation".SEPARATION AND PURIFICATION TECHNOLOGY 178(2017):279-287.
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