添加壳聚糖溶胶-凝胶法制备的TiO_2光催化剂及其光催化性能研究

Preparation of chitosan added TiO_2 photocatalyst by sol-gel method and its photocatalytic activity

采用添加壳聚糖(CTS)的溶胶-凝胶法制备了具有较高光催化活性的TiO_2光催化剂,并用XRD、TEM、BET和IR等手段对其进行表征。结果表明,CTS的添加使TiO_2衍射强度增强、分散性提高、比表面积增大从而使光催化活性提高;用所制备的催化剂光催化降解甲基橙反应60 min后,其去除率由不添加CTS所制备TiO_2的32%提高到48%,TOC去除率由14%提高到23%。

This paper investigated the process of preparing chitosan （CTS） added TiO2 photocatalyst with high photocatalytic activity by a sol-gel method, using Ti（OBu） 4 as precursor and ethanol as solvent. The catalyst was characterized by XRD, IR, TEM and BET methods. The optimum concentration of CTS added is 1wt%. The photocatalytie activity of CTS added TiO2 was improved than TiO2 alone. After 60 minutes photocatalytic degradation for methyl orange, the removal rate increased from 32% to 48% ,and the removal rate of TOC increased from 14% to 23% compared to pure TiO2.