改性介孔TiO2对亚甲基蓝的光催化降解

摘要

The mesoporous TiO2 were synthesized by a sol-gel process using titanium tetrachloride as a Ti source.The mesoporous TiO2 were treated with different concentrations of acid and alkali solution.The samples were characterized by SEM,XRD,N2/adsorption-desorption.The photocatalytic performance of the samples were investigated by degradation of methylene blue under a xenon lamp (500 W)irradition.The results indicated that,mesoporous TiO2 treated after 6 mol/L NaOH has the better adsorption and photocatalytic degradation activity to methylene blue,and the change of pH has little influence to the photocataytic activity of the modified mesoporous TiO2.%以四氯化钛为钛源采用溶胶凝胶法制备了介孔TiO2材料,并对所制备的材料采用不同浓度的酸碱溶液进行了水热处理.通过SEM、XRD、N2/吸附-脱附等检测手段对样品进行了表征.以氙灯(500W)为光源,亚甲基蓝为目标降解物,考察了样品的光催化性能.结果表明:6mol/L NaOH水热处理后的介孔TiO2对亚甲基蓝的吸附及光催化降解效果都有很大提高,且pH变化对光催化降解影响不大.