CuO/TiO2-H2O2可见光催化亚甲基蓝脱色效果及影响因素研究

以水解法制备的锐钛矿型TiO2为载体,制备了CuO/TiO2型光催化剂.以亚甲基蓝为对象,在可见光照射下研究了H2O3加入量、pH值和催化剂投加量对脱色效果的影响,同时与改性前的TiO2催化剂进行了脱色效果的对比.结果表明亚甲基蓝在碱性条件下能较好脱色,H2O2用量和CuO/TiO2催化剂投加量分别为每1 000 mL反应液各加入10 mL和0.1 g时脱色最好;另外,TiO2催化剂也在碱性条件下能较好脱色,H2O2用量和催化剂投加量分别为每1 000 mL反应液各加入12.5 mL和0.1 g时脱色最好.最优条件下对比实验表明,CuO/TiO2型催化剂在可见光照射下具有很高的催化活性,亚甲基蓝2 h脱色率达到88%,远好于改性前的TiO2和Degussa P25催化剂.

Study on decolorization effect and influencing factors of methylene blue in CuO/TiO2-H2O2 photocatalytic system under visible light

The TiO₂ powder photocatalyst was prepared by hydrolyze method, and CuO/TiO₂ photocatalyst was prepared by CuO supported on these TiO₂. Influence of H₂O₂ concentration, pH value and TiO₂ concentration were studied by examing decolorization rate of methylene blue under visible light. And photocatalytic activity of TiO₂ photocatalyst without CuO was also studied as contrast. Methylene blue can be preferably decolorized under alkaline condition. Decolorization rate reaches the best when H₂O₂ is 10 mL per 1 000 mL methylene blue and photocatalysts dosage is 0.1 g. TiO₂ photocatalyst also can decolorize methylene blue under alkaline condition, but decolorization rate reaches the best when H₂O₂ is 12.5 mL and photocatalyst dosage is 0.1 g. Contrast experiment under optimum conditions shows that decolorization rate using CuO/TiO₂ photocatalyst reaches 88% within 2 h, which is much better than TiO₂ and Degussa P25.