Controlling the inner surface pore and spherulite structures of PVDF hollow fiber membranes in thermally induced phase separation using triple-orifice spinneret for membrane distillation

Fang, C; Liu, W; Zhang, P; Yao, M; Rajabzadeh, S; Kato, N; Kyong Shon, H; Matsuyama, H

Controlling the inner surface pore and spherulite structures of PVDF hollow fiber membranes in thermally induced phase separation using triple-orifice spinneret for membrane distillation

Fang, C Liu, W Zhang, P Yao, M Rajabzadeh, S Kato, N Kyong Shon, H Matsuyama, H

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Publisher:: Elsevier BV
Publication Type:: Journal Article
Citation:: Separation and Purification Technology, 2021, 258, pp. 117988
Issue Date:: 2021-03-01

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Field	Value	Language
dc.contributor.author	Fang, C
dc.contributor.author	Liu, W
dc.contributor.author	Zhang, P
dc.contributor.author	Yao, M
dc.contributor.author	Rajabzadeh, S
dc.contributor.author	Kato, N
dc.contributor.author	Kyong Shon, H
dc.contributor.author	Matsuyama, H
dc.date.accessioned	2022-04-10T03:17:17Z
dc.date.available	2022-04-10T03:17:17Z
dc.date.issued	2021-03-01
dc.identifier.citation	Separation and Purification Technology, 2021, 258, pp. 117988
dc.identifier.issn	1383-5866
dc.identifier.issn	1873-3794
dc.identifier.uri	http://hdl.handle.net/10453/156014
dc.description.abstract	In this study, we controlled the inner surface structures of polyvinylidene fluoride (PVDF) hollow fiber membranes via a thermally induced phase separation process using a triple-orifice spinneret for direct-contact membrane distillation (DCMD). The coextrusion of propylene carbonate (PC) through the outermost channel of the spinneret led to porous outer surfaces with similar pore sizes and spherulitic structures for all the PVDF hollow fiber membranes. In the innermost channel, the extrusion of solvents having different compatibilities with PVDF and the diluent (PC) as the bore liquids controlled the inner surface pore sizes and spherulite structures, and the effects of these inner surface structures on the DCMD performance were investigated in detail. Increasing the compatibility of the bore liquids toward the diluent led to an increase in the inner surface pore size because of the formation of loose, isolated spherulites, which remarkably enhanced the water vapor permeability from 4 to 8.3 L m−2 h−1, while reducing the membrane hydrophobicity, liquid entry pressure, and salt rejection. When increasing the bore liquid compatibility with the polymer, the surface pore size decreased because of the tight spherulite contact, enhancing membrane salt rejection and wetting resistance. Given the significance of bore liquid compatibility with the diluent and the polymer in controlling the inner surface structures, a useful guideline is presented for selecting the appropriate bore liquids to prepare hollow fiber membranes with the desired inner surface structures for high MD performance.
dc.language	en
dc.publisher	Elsevier BV
dc.relation.ispartof	Separation and Purification Technology
dc.relation.isbasedon	10.1016/j.seppur.2020.117988
dc.rights	info:eu-repo/semantics/closedAccess
dc.subject	0301 Analytical Chemistry, 0904 Chemical Engineering
dc.subject.classification	Chemical Engineering
dc.title	Controlling the inner surface pore and spherulite structures of PVDF hollow fiber membranes in thermally induced phase separation using triple-orifice spinneret for membrane distillation
dc.type	Journal Article
utslib.citation.volume	258
utslib.for	0301 Analytical Chemistry
utslib.for	0904 Chemical Engineering
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology/School of Civil and Environmental Engineering
pubs.organisational-group	/University of Technology Sydney/Strength - CTWW - Centre for Technology in Water and Wastewater Treatment
utslib.copyright.status	closed_access	*
dc.date.updated	2022-04-10T03:17:14Z
pubs.publication-status	Published
pubs.volume	258

Abstract:

In this study, we controlled the inner surface structures of polyvinylidene fluoride (PVDF) hollow fiber membranes via a thermally induced phase separation process using a triple-orifice spinneret for direct-contact membrane distillation (DCMD). The coextrusion of propylene carbonate (PC) through the outermost channel of the spinneret led to porous outer surfaces with similar pore sizes and spherulitic structures for all the PVDF hollow fiber membranes. In the innermost channel, the extrusion of solvents having different compatibilities with PVDF and the diluent (PC) as the bore liquids controlled the inner surface pore sizes and spherulite structures, and the effects of these inner surface structures on the DCMD performance were investigated in detail. Increasing the compatibility of the bore liquids toward the diluent led to an increase in the inner surface pore size because of the formation of loose, isolated spherulites, which remarkably enhanced the water vapor permeability from 4 to 8.3 L m−2 h−1, while reducing the membrane hydrophobicity, liquid entry pressure, and salt rejection. When increasing the bore liquid compatibility with the polymer, the surface pore size decreased because of the tight spherulite contact, enhancing membrane salt rejection and wetting resistance. Given the significance of bore liquid compatibility with the diluent and the polymer in controlling the inner surface structures, a useful guideline is presented for selecting the appropriate bore liquids to prepare hollow fiber membranes with the desired inner surface structures for high MD performance.

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http://hdl.handle.net/10453/156014