可见光响应复合高效光催化剂的制备及应用

Preparation and application of a high efficient composite photocatalyst of visible light activity

采用溶胶-凝胶法将过渡金属离子Fe和稀土离子Sm共掺杂改性纳米TiO2,首次将其负载在具有大比面积、微孔结构丰富的活性炭纤维载体上,制备出新型复合高效光催化剂。以甲基橙模拟染料废水为降解目标,考察催化剂的光催化活性。通过XRD、SEM、BET等手段表征其性质。结果表明:共掺杂改性复合光催化剂的光催化活性要明显优于空白炭纤维、纯二氧化钛负载活性炭纤维和单掺杂改性复合光催化剂的光催化活性,当煅烧温度500℃、n(Fe)∶n(Sm)∶n(Ti)为0.05∶0.1∶1、TiO2在活性炭纤维上的负载量为45%时,光催化效果最好;将光催化剂重复利用7次后,再次降解高质量浓度甲基橙溶液,降解率仍然超过95%;新型复合光催化剂对工业RO浓缩水中COD去除率可达37.12%。

The samarium ions and iron ions were used to codope the modified titanium dioxide, and ACF was used as the cartier with enormous surface area. The photocatalytic activity was evaluated by studying decomposition of the methyl orange （MO） solution under different light source. A high efficient composite photocatalyst was prepared by the sol-gel method and characterized by various techniques including X-ray powder diffraction （ XRD）, scanning electron microscopy （ SEM）, BET. The results show that the new composite photocatalysts have higher photocatalytic activity than Fe/TiO2/ACF, Sm/TiOJ ACF,TiO2/ACF and original ACF. When n（Fe） ： n（Sm） ： n（Ti）= 0.05 ： 0. 1 ： 1, the loading of the TiO2 is 45% and the calcination temperature is 500 ℃, the new photocatalyst has the highest photocatalytic activity. Photocatalyst also can degrade high concentration methyl orange solution and can remain high activity by reusing it for seven times. Through the degradation of the RO condensed water, the removal rate can reach 37. 12%.