Removal of direct dyes from aqueous solution by oxidized starch cross-linked chitosan/silica hybrid membrane

In this research, chitosan/oxidized starch/silica (CS/OSR/Silica) hybrid membrane was prepared by using oxidized starch and 3-aminopropyltriethoxysilane (APTES) as cross-linking agents. The characterizations of the hybrid membrane were investigated by using attenuated total reflection (ATR) spectros...

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Bibliographic Details
Published in:International journal of biological macromolecules 2016-01, Vol.82, p.174-181
Main Authors: He, Xuemei, Du, Mei, Li, Hui, Zhou, Tianchi
Format: Article
Language:English
Subjects:
Adsorption
Calorimetry, Differential Scanning
Chitosan
Chitosan - chemistry
Coloring Agents - chemistry
Direct dyes
Hybrid
Hydrogen-Ion Concentration
Kinetics
Membranes, Artificial
Molecular Structure
Oxidized starch
Silicon Dioxide - chemistry
Solutions
Spectroscopy, Fourier Transform Infrared
Starch - chemistry
Temperature
Thermogravimetry
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Summary:In this research, chitosan/oxidized starch/silica (CS/OSR/Silica) hybrid membrane was prepared by using oxidized starch and 3-aminopropyltriethoxysilane (APTES) as cross-linking agents. The characterizations of the hybrid membrane were investigated by using attenuated total reflection (ATR) spectroscopy, scanning electron microscopy (SEM), thermogravimetry (TG) analysis and swelling measurement. The CS/OSR/Silica hybrid membrane exhibited the improved thermal stability and low degree of swelling in water. The adsorption properties of the CS/OSR/Silica hybrid membrane were studied by using two direct dyes (Blue 71 and Red 31). The results indicated the adsorption capacity of the CS/OSR/Silica hybrid membrane was found optimal at pH 9.82 and temperature 60°C for Blue 71 and Red 31. The adsorption kinetic data followed pseudo-second order kinetic model and the adsorption behavior of the two dyes on the hybrid membrane fitted well with the Freundlich model. The CS/OSR/Silica hybrid membrane can be used as an appropriate biosorbent for removal of direct dyes from colored wastewater.
ISSN:0141-8130
1879-0003
DOI:10.1016/j.ijbiomac.2015.11.005