双效功能型复合光催化剂Ag/TiO2/AC的制备及光催化活性

Preparation and Activity of Ag/TiO2/AC Photo-catalyst with Double Function

摘要:

以硝酸银、四氯化钛及活性炭为原料，采用溶胶-凝胶法和浸渍法制备了一系列复合光催化剂。通过TEM、XRD、BET和UV-Vis光谱对复合光催化剂的形貌、物相组成、比表面积和吸光性能进行了表征，并以甲基橙的脱色降解为模式反应，考察了样品的光催化性能。结果表明:其光催化活性序列为Ag/TiO2/AC>Ag/TiO2>TiO2，其中Ag/TiO2/AC由于具有较大的比表面积和Ag的负载改性而具有吸附-光催化双效功能，且其光催化活性最高，对光的吸收扩展到可见光区。连续重复使用5次时，Ag/TiO2/AC对甲基橙溶液的脱色降解率基本保持不变。

Abstract:

A series of composite photo-catalysts were synthesized by sol-gel and impregnation process using silver nitrate, titanium tetrachloride and activated carbon as raw materials. The physical and chemical properties of the composite photo-catalyst, such as morphology、phase composition、specific surface area and optical absorption properties, were characterized by using TEM、XRD、BET and UV-Vis techniques. Taking methyl orange degradation as a model reaction, the photo-catalytic activity of the photo-catalysts were investigated. The results indicate: Ag/TiO2/AC>Ag/TiO2>TiO2. Among them the Ag/TiO2/AC with adsorption, photo-catalytic double-effect function have the highest photo-catalytic activity and its absorption of light extended to visible light region because of its larger specific surface area and modification by loading of silver. Its photo-catalytic activity didn’t basically decrease when it was repeatedly used for 5 times.