The dehydration performance and sorption behavior of PVA/silica hybrid pervaporative membrane
Haikuan Yuan
A * , Cun Bao A , Ruiran Hao B and Jie Lu A *
+ Author Affiliations
- Author Affiliations
A College of Chemistry and Chemical Engineering, Shanghai University of Engineering Science, Shanghai 201620, China.
B School of Environmental Engineering, Yellow River Conservancy Technical Institute, Kaifeng 475004, China.
Australian Journal of Chemistry 75(10) 820-834 https://doi.org/10.1071/CH22106
Submitted: 16 May 2022 Accepted: 6 September 2022 Published: 10 November 2022
© 2022 The Author(s) (or their employer(s)). Published by CSIRO Publishing.
Abstract
A polyvinyl alcohol (PVA)/SiO2 organic-inorganic hybrid membrane was fabricated, using PVA as the basic material, SiO2 nanoparticles as the inorganic material, γ-(2,3)-glycidoxy propyl trimethoxysilane (GPTMS) and 3-aminopropyl triethoxysilane (APTEOS) as the second modified agents. The dehydration performance of PVA-SiO2/polyacrylonitrile (PAN) composite membrane to ethyl acetate (EA)/H2O, EA/ethanol (EtOH)/H2O and EA/EtOH/acetic acid (HAc)/H2O solutions was investigated. After modification of the second coupling agent of APTEOS or GPTMS, PVA-SiO2/PAN composite membrane had the better dehydration performance to these aqueous solutions. When dehydrating PVA-SiO2/PAN composite membrane modified by GPTMS (M5 membrane) in EA/H2O binary solution (98/2, wt%) at 40°C, the separation factor and the total permeation flux were 5245 and 293.9 g m−2 h−1, respectively. The preparation method of PVA/SiO2 membrane through adding the second coupling agent was simple, it had good dehydration performance and has excellent application prospects. The sorption behavior of PVA/SiO2 hybrid membrane was systematically studied, providing sufficient data for studying the separation mechanism of pervaporative membrane. The degree of swelling (DS) and the sorption selectivity of the membrane in different feed compositions and temperatures were measured to determine the static sorption of membrane. Dynamic sorption more clearly reflects the sorption and swelling processes of the membrane, and the dynamic sorption curves of the membrane in EA aqueous solutions were obtained. The sorption behavior of membrane to permeate components was studied by ATR-FTIR. Changes in the characteristic peaks for the permeate components and membrane indicated the sorption behavior of the membrane.
Keywords: dehydration, dynamic sorption, FTIR, hybrid membrane, multicomponent solution, pervaporation, second coupling agent, sorption behavior.
References
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