TiO_2/Fe-杭锦2~#土催化剂光催化降解废水中乙酸的研究

Photocatalytic Degradation of Acetic Acid in Wastewater by TiO_2/Fe-Hangjin 2~# Catalyst

首先采用离子交换法制得Fe-杭锦2#土,以其为载体使用溶胶-凝胶法制备了TiO_2/Fe-杭锦2#土负载型光催化剂,并通过X射线粉末衍射(XRD)、氮气吸附脱附(N2-BET)、固体紫外可见漫反射(UV-Vis DRS)、X射线光电能谱(XPS)和扫描电子显微镜(SEM)分析等对催化剂进行了表征.以光催化降解乙酸为探针反应,考察了Ti的负载量、光源、光照时间、催化剂用量和反应温度等反应条件对催化剂催化性能的影响.实验结果表明,对于浓度为100 mg·L-1的乙酸溶液,选用氧化钛负载量为20%的光催化剂、300 W汞灯为光源、反应温度为50℃、反应时间为6 h、催化剂用量为50 g·L^(-1)时,对乙酸的光催化降解效果相对最优,降解率达到78.30%.

TiO2/Fe-Hangjin 2# supported catalysts were prepared by sol-gel method using Fe-Hangjin 2# as support, which was developed from Hangjin 2# clay by ion-exchange method under alkaline condition. XRD, BET, UV-Vis DRS, XPS, and SEM were used to characterize these photocatalysts and their photocatalytic performances for degradation of acetic acid were studied. The effects of Ti loading, amount of catalyst, reaction temperature, light source and irradiation time on the catalytic performance were investigated. For the acetic acid solution with concentration of 100 mg·L-1, at the optimum reaction conditions, 300 W mercury lamp as light source, 20% Ti loading, 50 g·L-1 catalyst, reaction temperature of 50℃ and the reaction time of 6 h, 78.3% of degradation of acetic acid were obtained.