La2O3/ZnO/TiO2光催化降解活性艳红K-2BP的研究

采用溶胶-凝胶法制备了La2O3/ZnO/TiO2复合光催化剂,以紫外灯为光源,活性艳红K-2BP为模型降解物,研究了La2O3/ZnO/TiO2的光催化性能。结果表明：当锌和镧的掺杂量w(ZnO)=20%, w(La2O3)=0.5%, 煅烧温度为500℃时,La2O3/ZnO/TiO2复合光催化剂的光催化活性最高；当催化剂投加量4 g/L,通气量800 mL/min,初始pH值3.12时,La2O3/ZnO/TiO2对活性艳红K-2BP的降解效果最好。实验证明,La2O3/ZnO/TiO2对活性艳红K-2BP的降解遵从Langmuir-Hinshelwood动力学模型,测得其反应速率常数k＝11.5 mg/(L·min)；吸附常数K＝2.88×10-2 L/mg。

Photocatalytic degradation of reactive brilliant red K-2BP by La2O3/ZnO/TiO2

La2O3/ZnO/TiO2 composite photocatalyst was prepared by sol-gel method. Being a model reaction, the photocatalytic degradation of reactive brilliant red K-2BP in La2O3/ZnO/TiO2 nanopowder suspension irradiated by UV-lamp was investigated. As results, the addition of La2O3 and ZnO toTiO2 enhanced its photocatalytic activity notably, and the optimum concentrations of ZnO and La2O3 were 20% and 0.5%, respectively. The best degradation efficiency of K-2BP by the complexed photocatalysts(calcined at 500℃ for 2 h) was acquired with the amount of photocatalysts 4 g/L,the air flow rate 800 mL/min and initial pH 3.12. The photocatalytic degradation of K-2BP was experimentally demonstrated to follow the Langmuir-Hinshelwood kinetic model, the reaction rate constant k=11.5 mg/(L·min) and the adsorption constant K=2.88×10-2 L/mg were determined.