微波辅助制备B-N共掺杂TiO_2催化剂及其光催化活性

以钛酸丁酯为钛源,采用微波辅助溶胶-凝胶法制备Ti O2微粒,用于亚甲基蓝染料紫外光照降解实验。对比研究了未掺杂、B掺杂、N掺杂和B-N共掺杂Ti O2的光催化活性,采用扫描电子显微镜表征催化剂微观结构,用Langmuir-Hinshelwood模型进行动力学拟合,并从电化学角度分析。结果表明,采用微波辅助溶胶-凝胶法制备的B-N共掺杂Ti O2具有最佳催化活性,其表面形貌比未掺杂Ti O2更均匀,具有更高的比表面积,同时B-N共掺杂使Ti O2催化剂产生了微观的p-n结效应,表现出很好的催化活性。在B-N共掺杂Ti O2催化剂用量为2 g·L-1和亚甲基蓝初始浓度为10 mg·L-1条件下,室温紫外光照4 h,亚甲基蓝降解率达91.6%。

Preparation of B-N co-doped TiO2 catalyst by microwave-assisted method and its photocatalytic activity

Using tetrabutyl titanate as titanium source,TiO2 particles were prepared by microwave-assisted sol-gel method,and then were used for the degradation of methylene blue dye under UV irradiation.The catalytic activities of the undoped,B-doped,N-doped and B-N co-doped TiO2 were investigated,and their microstructures were characterized by scanning electron microscopy.Kinetics fitting was carried out by Langmuir-Hinshelwood model.The catalysts were analyzed by electrochemistry method.The results showed that B-N co-doped TiO2 possessed the best catalytic activity,and more uniform surface morphology and higher specific surface area than undoped TiO2.TiO2 catalyst had good catalytic activity due to the p-n junction effect at the microscopic level,which co-doping of B and N produced.When the concentration of B-N co-doped TiO2 was 2 g·L-1 and the initial concentration of methylene blue was 10 mg·L-1, the degradation rate of methylene blue reached 91.6% at room temperature under UV light irradiation for 4 h.