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主要研究了电场对纳米TiO2光催化降解亚甲蓝的影响,在透射电镜(TEM)、X射线衍射(XRD)、比表面积(BET)等方法测定纳米TiO2结构的基础上,结合不同结构纳米TiO2在不同电场强度下催化降解亚甲蓝的性能测试,探讨了电场影响纳米TiO2催化降解亚甲蓝反应机理。结果表明:N及F掺杂溶剂热合成法制备的纳米TiO2颗粒尺寸小且粒径均匀,电场的引入降低了纳米TiO2的光催化性能,而且下降程度与电场强度的变化成反比,反应动力学拟合表明,电场下不同结构的纳米TiO2催化降解亚甲蓝反应均为一级反应。
The effects of electric field on the photocatalytic degradation of methylene blue with nano-TiO2 were studied. The structure of nano-TiO2 was determined by TEM, XRD and BET. The photocatalytic degradation of methylene blue under different electric field intensities was tested. The mechanism of photocatalytic degradation of methylene blue by nano-TiO2 was discussed. The results show that the nano-TiO2 particles prepared by thermal synthesis of N and F doped solvents have small size and uniform particle size. The introduction of electric field decreases the photocatalytic activity of nano-TiO2, and the degree of decrease is inversely proportional to the change of electric field strength. The reaction kinetics The fitting shows that the photocatalytic degradation of methylene blue with different structures under the electric field is a first-order reaction.