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采用浸渍法制备了表面键联型TiO2 /SiO2 固定化光催化剂 .XRD ,FT IR ,XPS和BET比表面积测定结果表明 ,TiO2 通过Ti O Si联结负载于多孔硅胶的表面 ,由此提出TiO2 /SiO2 的结构模型 .考察了多孔硅胶的粒度及氧化钛负载量对催化剂活性的影响 .对活性艳红K 2G (R15 )的光催化脱色反应 ,最佳的光催化剂 30 %TiO2 /SiO2(Ims30 )比B TiO2 粉末的催化速率快 3倍 .随着载体粒度的减小 ,催化剂的比表面积增大 ,催化活性升高 ;多孔硅胶不仅起着支持体的作用 ,而且具有分散的作用 ;多孔硅胶具有很好的透光性 .经 ξ 电位测定 ,所制备催化剂的等电点为 3.0pH单位 ,表明催化剂表面呈酸性 .
The surface-bonded TiO 2 / SiO 2 photocatalyst was prepared by impregnation method.The results of XRD, FT IR, XPS and BET surface area showed that TiO 2 was supported on the surface of porous silica by Ti O Si, The effect of photocatalytic decolorization of reactive brilliant red K 2G (R15), the best photocatalyst 30% TiO2 / SiO2 (Ims30) ratio B TiO2 powder catalyzed three times faster.With the decrease of carrier particle size, the specific surface area of the catalyst increased, the catalytic activity increased; porous silica not only played the role of support, but also has a dispersing effect; porous silica gel has a very Good translucency.According to the zeta potential measurement, the isoelectric point of the prepared catalyst is 3.0 pH units, indicating that the catalyst surface is acidic.