Layer-by-layer of graphene oxide-chitosan assembly on PVA membrane surface for the pervaporation separation of water-isopropanol mixtures

Autor: SeonYong Yun, Shivshankar Chaudhari, JiHyeon Park, You-In Park, ByeongYun An, GiJung Lee, SongEun Lee, SoHyan Joo, Kie Yong Cho, MinYoung Shon
Rok vydání: 2021
Předmět:
Zdroj: Korean Journal of Chemical Engineering. 38:411-421
ISSN: 1975-7220
0256-1115
DOI: 10.1007/s11814-020-0726-8
Popis: A graphene oxide/chitosan polyelectrolyte layer was used to modify the surface of a polyvinyl alcohol/tetraethyl orthosilicate membrane by layer-by-layer interfacial complexation and, thus, improve the pervaporation characteristics. The interfacial complexation between the chitosan and graphene oxide was confirmed by Fourier-transform infrared and X-ray photoelectron spectroscopy; the changes in surface hydrophilicity after layer-by-layer modification were examined by contact angle measurements, and the morphology of the layer-by-layer membrane was elucidated by field-emission scanning electron microscopy analysis. The pervaporation performance of the modified membranes was evaluated by performing the separation of water-isopropanol (IPA) azeotropes under different operating conditions. In the pervaporation experiments, the best performance was obtained using a membrane with 15 chitosan-GO layers (denoted 15L-L(CH-GO)). For this membrane, the flux increased from 13.6 to 76.4 g/m2h and the separation factor decreased from 56,720 to 4,001 as the feed temperature was varied from 30 to 60 °C for an 80: 20 (w/w) IPA/water feed. The apparent permeation activation energies were calculated and that of IPA (122.8 kJ/mol) was greater than that of water (47.4 kJ/mol).
Databáze: OpenAIRE
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