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Journal of Polymer Research

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01.09.2017 | ORIGINAL PAPER

Morphological controlling of CTA forward osmosis membrane using different solvent-nonsolvent compositions in first coagulation bath

verfasst von: Yi-Cheng Zuo, Xiang-Yu Chi, Zhen-Liang Xu, Xue-Jiao Guo

Erschienen in: Journal of Polymer Research | Ausgabe 10/2017

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Abstract

Cellulose triacetate (CTA) membranes were fabricated via a modified nonsolvent induced phase separation (NIPS) method. Different solvent-nonsolvent compositions in first coagulation bath (FCB) were introduced to optimize CTA membrane structures. The effects of FCB compositions, immersion time and mass ratio of solvent (N-methyl-2-pyrrolidone, NMP) and nonsolvent (water, ethanol, ethylene glycol and glycerol) on membrane morphology and performance were systematically investigated. Prospective membranes with a dense bottom layer and a scaffold-like top layer were obtained under room temperature, owing to the low relative energy difference (RED) between nonsolvent and polymer as well as the high viscosity of FCBs. A high water flux J_v (12.6 L m⁻² h⁻¹) and a low reserve salt flux J_s (1.32 g m⁻² h⁻¹) were obtained in the optimized membrane, with a structural parameter S of 119 μm. Compared with membranes prepared via conventional NIPS method and commercial CTA forward osmosis (FO) membranes, a remarkable improvement of J_s/J_v value and S value was achieved, indicating membranes with single dense-layer structure might suffer less from internal concentration polymerization (ICP) which is the main obstacle for the development of FO process. This study might help us pave the way to design superior CTA membrane structures for forward osmosis application.

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Titel: Morphological controlling of CTA forward osmosis membrane using different solvent-nonsolvent compositions in first coagulation bath
verfasst von: Yi-Cheng Zuo
Xiang-Yu Chi
Zhen-Liang Xu
Xue-Jiao Guo
Publikationsdatum: 01.09.2017
Verlag: Springer Netherlands
Erschienen in: Journal of Polymer Research / Ausgabe 10/2017
Print ISSN: 1022-9760
Elektronische ISSN: 1572-8935
DOI: https://doi.org/10.1007/s10965-017-1311-7

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