以钛酸四丁酯为钛源,采用溶胶-凝胶法在多孔活性炭(AC)表面合成TiO2前驱体,在氮气保护下程序升温处理制得TiO2/AC负载型光催化剂. 采用X射线衍射、漫反射光谱、傅里叶变换红外光谱、扫描电镜、能量色散谱和低温液氮吸附等对光催化剂晶相结构、光谱特征及表面结构进行了表征. 结果表明, AC可提高TiO2分散性能,降低TiO2团聚体的尺寸,并抑制其由锐钛矿相向金红石相的转变. TiO2与AC接触界面处有 Ti - O - C 键生成. 另外, AC的含量对TiO2的能阈结构和晶粒大小影响不大. 苯酚溶液的光催化降解测试结果表明, AC负载可为TiO2提供高浓度反应环境,适宜量的负载可显著提高TiO2对有机稀溶液的光催化降解活性. 对于50 mg/L苯酚的光催化降解, AC的质量分数分别为5%, 9%和11%时催化剂协同系数分别为1.1, 1.5和1.3. 循环使用7次后, AC含量为9%的催化剂对苯酚的降解率仍达95.84%.
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