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采用溶胶凝胶法制备不同SiO_2摩尔含量的TiO_2/SiO_2复合光催化剂,以亚甲基蓝(MB)的物理吸附降解与光催化降解为探针反应,分别评价了TiO_2/SiO_2复合光催化剂的物理吸附性能和光催化性能,并采用XRD、BET对样品结果进行了表征。结果表明,适量的SiO_2引入可改善光催化剂的孔结构,一定程度上提高材料物理吸附能力,有效提高光催化性能,对亚甲基蓝的光降解率可达76%;而过高的SiO_2引入可显著提高材料的比表面积,平均孔径相对较小,但抑制TiO_2的结晶,晶型表现为无定型结构,对亚甲基蓝的降解主要表现为物理吸附降解而无光催化作用。
The sol-gel method was used to prepare TiO 2 / SiO 2 composite photocatalyst with different SiO 2 molar content. The physical adsorption degradation and photocatalytic degradation of methylene blue (MB) were used as the probe reaction. The physical adsorption performance of TiO 2 / SiO 2 composite photocatalyst and light The catalytic performance and XRD, BET sample results were characterized. The results showed that the appropriate amount of SiO 2 could improve the pore structure of the photocatalyst, improve the physical adsorption capacity of the material to a certain extent, and effectively improve the photocatalytic performance, and the photodegradation rate of methylene blue can reach 76%; while the introduction of too high SiO 2 can remarkably increase The specific surface area and the average pore diameter of the material are relatively small, but the crystallization of TiO 2 is restrained. The amorphous structure is amorphous. The degradation of methylene blue is mainly characterized by physical adsorption and degradation without photocatalysis.