以有序介孔SiO2（简称KIT-6）为载体， 采用钛酸丁酯水解法将纳米TiO2与KIT-6复合， 并通过沉积沉淀法将纳米Ag粒子负载于其上， 首次制得Ag-TiO2/KIT-6复合光催化剂， 并采用相同的方法制备了一系列相关的催化剂。 以光催化降解甲基橙来评价其催化性能， 光催化活性顺序为Ag-TiO2/KIT-6＞Ag/TiO2＞TiO2/KIT-6＞TiO2＞Ag/KIT-6。 利用XRD、 N2物理吸附、 XPS、 UV-Vis DRS和TEM对系列催化剂进行表征， 结果表明Ag-TiO2之间形成的异质结和催化剂的大比表面积是Ag-TiO2/KIT-6具有最高光催化活性的重要原因。 其中Ag-TiO2之间的异质结结构， 有效抑制了光生电子和光生空穴在TiO2表面和体相内部的复合， 提高了光催化活性； 此外Ag-TiO2/KIT-6的大比表面积大大提高了催化剂的吸附能力， 增加了催化剂与污染物的接触， 达到快速光催化降解污染物的目的。

In the present paper, ordered mesoporous silica (KIT-6) as support, nanosized TiO2 into KIT-6 was synthesized by titanium tetraisopropoxide hydrolysis. Then silver was loaded by deposition-precipitation method. Ag-TiO2/KIT-6 composite nanosized photocatalyst was firstly synthesized and a series of correlated catalysts were synthesized by the same preparation method. Methyl orange is presently adopted as a representative organic pollutant to evaluate the photocatalytic performance of the as-synthesized catalysts. The order of photocatalytic activity of the as-synthesized samples was found as Ag-TiO2/KIT-6＞Ag/TiO2＞TiO2/KIT-6＞TiO2＞Ag/KIT-6. Detailed characterizations were conducted by techniques including XRD, N2 physical adsorption, XPS, UV-Vis DRS and TEM. It was found that the Ag-TiO2/KIT-6 sample shows the highest photocatalytic activity, which should be attributed to the Ag-TiO2 heterojunction structure and higher BET surface area of the Ag-TiO2/KIT-6 sample. Ag-TiO2 heterojunction improves the separation of photogenerated electron-hole pairs, thus enhancing the photocatalytic activity; Ag-TiO2/KIT-6 sample possesses high BET surface area, which facilitates adsorption and transportation of dye molecules, also leading to higher photocatalytic activity.