壳聚糖
吸附
聚乙烯醇
热重分析
复合数
傅里叶变换红外光谱
甲基橙
化学
弗伦德利希方程
核化学
化学工程
热稳定性
朗缪尔吸附模型
材料科学
高分子化学
有机化学
复合材料
催化作用
光催化
工程类
作者
Umma Habiba,Chin Joo Tan,Tawsif A. Siddique,Areisman Salleh,Bee Chin Ang,Amalina M. Afifi
标识
DOI:10.1016/j.ijbiomac.2017.07.007
摘要
The chitosan/polyvinyl alcohol/TiO2 composite was synthesized. Two different degrees of deacetylation of chitosan were prepared by hydrolysis to compare the effectiveness of them. The composite was analyzed via field emission scanning electron microscopy, Fourier transform infrared, X-ray diffraction, thermal gravimetric analysis, weight loss test and adsorption study. The FTIR and XRD results proved the interaction among chitosan, PVA and TiO2 without any chemical reaction. It was found that, chitosan with higher degree of deacetylation has better stability. Furthermore, it also showed that higher DD of chitosan required less time to reach equilibrium for methyl orange. The adsorption followed the pseudo-second-order kinetic model. The Langmuir and Freundlich isotherm models were fitted well for isotherm study. Adsorption capacity was higher for the composite containing chitosan with higher DD. The dye removal rate was independent of the dye's initial concentration. The adsorption capacity was increased with temperature and it was found from reusability test that the composite containing chitosan with higher DD is more reusable. It was notable that adsorption capacity was even after 15 runs. Therefore, chitosan/PVA/TiO2 composite can be a very useful material for dye removal.
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