外界条件对纳米TiO2光催化性能的影响

Effect of external conditions on photocatalytic properties of nano-TiO2

摘要:

为找到纳米TiO2的最佳催化条件,以钛酸丁酯为原料,采用溶胶-凝胶法制备纳米级的掺杂Fe3+的TiO2粉末.通过XRD确定其相组成,利用紫外可见分光光度计测定光催化活性,研究外界条件包括光强度、溶液的pH值及环境温度对光催化反应的影响.结果表明:光强度在一定范围内越大光催化活性越高;pH值在4时光催化活性最大;环境温度对光催化反应无太大影响.在较高的光强度、pH=4的条件下光催化活性最好.

Abstract:

In order to find the optimal photocatalytic conditions for nano-TiO2,the Fe3+-doped nano TiO2powder was prepared by sol-gel method using butyl titanate as raw material.Its composition was determined by XRD.Its photocatalytic properties were examined by UV-Vis,and the effect of external conditions including light intensity,pH value and surrounding temperature was disscused.Results indicate that in a certain range,the photocatalytic activity is enhanced with the increased light intensity,and the highest photocatalytic activity is achieved when pH =4,while the ambient temperature has little effect on photocatalytic reaction.