Habiba Umma, Joo Tan Chin, Siddique Tawsif A, Salleh Areisman, Ang Bee Chin, Afifi Amalina M
Center of Advanced Material, Department of Mechanical engineering, Faculty of Engineering, University of Malaya, Kuala Lumpur, Malaysia.
Department of Mechanical Engineering, School of Science and Engineering, University of Creative Technology Chittagong, Bangladesh.
Int J Biol Macromol. 2017 Nov;104(Pt A):1133-1142. doi: 10.1016/j.ijbiomac.2017.07.007. Epub 2017 Jul 6.
The chitosan/polyvinyl alcohol/TiO 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 TiO 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/TiO composite can be a very useful material for dye removal.
合成了壳聚糖/聚乙烯醇/TiO复合材料。通过水解制备了两种不同脱乙酰度的壳聚糖，以比较它们的效果。通过场发射扫描电子显微镜、傅里叶变换红外光谱、X射线衍射、热重分析、失重测试和吸附研究对该复合材料进行了分析。傅里叶变换红外光谱和X射线衍射结果证明了壳聚糖、聚乙烯醇和TiO之间的相互作用，且无任何化学反应。结果发现，脱乙酰度较高的壳聚糖具有更好的稳定性。此外，还表明壳聚糖的脱乙酰度越高，达到甲基橙平衡所需的时间越短。吸附遵循准二级动力学模型。朗缪尔等温线模型和弗伦德利希等温线模型对等温线研究拟合良好。对于含有脱乙酰度较高的壳聚糖的复合材料，吸附容量更高。染料去除率与染料的初始浓度无关。吸附容量随温度升高而增加，从可重复使用性测试中发现，含有脱乙酰度较高的壳聚糖的复合材料更易于重复使用。值得注意的是，经过15次运行后吸附容量仍然保持不变。因此，壳聚糖/聚乙烯醇/TiO复合材料可能是一种非常有用的染料去除材料。
