Influence of Sulfonated-Kaolin On Cationic Exchange Capacity Swelling Degree and Morphology of Chitosan/Kaolin Composites

Abstract

Preparation of sulfonated-kaolin (sKao) has been conducted and used as filler on chitosan matrix via solution casting method, namely chitosan/sKao (Cs/sKao). Swelling degree, cationic exchange capacity and thermal stability were evaluated to determine chitosan/sKao membranes performance as proton exchange membrane in a fuel cell. Functional group analysis of chitosan, sKao and synthesized products were studied using Fourier Transform Infra-Red (FTIR) spectroscopy. In this study, swelling degree and swelling area of Cs/sKao were also examined to determine of membrane ability to swelling which compare to unmodified chitosan/kaolin (Cs/Kao). The presence of sKao in chitosan matrix was able to improve cationic exchange capacity (CEC) which proved by the morphological study of membrane surface after CEC test. Moreover, Thermal stability of Cs/sKao showed the membrane has meet requirement for Proton Exchange Membrane (PEM) application.

New route for synthesis and characterization sulfonated chitosan using acetyl sulfate as a sulfonating agent

“…CEC reflected the number of cation (in this study is Na + ion) exchange with a proton [16]. The presence of sulfonic group in the sulfonated chitosan is responsible for the proton migration Fig.…”