不同pH下Ag-TiO_2薄膜的光催化性能研究

Study on the photocatalytic activity of Ag-titanium dioxide in different pH

以钛酸丁酯为钛源，采用溶胶-凝胶法制备Ag—TiO2溶胶，将其涂覆在载玻片上制得高光催化活性的透明薄膜。在n[Ti（OC4H9）4]：n（C2H5OH）：n[NH（C2H4OH）2]：n（H2O）：n（AgNO3）=1：18：0．5：1：0．032的前提下，通过改变pH值和两种不同照射光源，对甲基橙溶液进行光催化降解。结果表明，当pH值在3-6的范围，不论哪种照射光源，甲基橙降解率可达到83％。红外光谱、能谱、热重-差热、透射电镜和原子力显微镜等测定，结果表明，光催化薄膜由粒径10-20nm的AgNO3和TiO2颗粒构成，锐钛晶形结构在500—550℃转变充分。

In this paper, the sol for Ag-TiO2 films was prepared with tetrabutyl titanate as precursor, coated on the slide glass. Under the same ratio of Ag/TiO2 and the same system n [ Ti （ OC4 H9 ） 4 ] ： n （ C2 H5 OH） ： n[NH （ C2 H4 OH） 2 ] ： n （ H2 O） ： n （ AgNO3 ） = 1 ： 18 ： 0.5 ： 1 ： 0.032, investigating the effects in different pH and two lights. The photocatalytic activity of the prepared film was studied by the degradation of methyl orange;when the pH between 3 -6,the conversion can up to 83%, whichever the two lights. The microstructure and properties of the films were studied by the ways of FTIR, EDX, DTA-TG,TEM, SEM, AFM, the results shows that：the photo-catalytic thin film is mainly composed of AgNO3 and TiO2 particles of 10 -20 nm, the phase transformation of anatase was sufficiency at 500 -550 ℃.