g-C_3N_4/TiO_2异质结光催化性能研究

Photocatalytic Properties of g-C_3N_4/TiO_2 Heterojunction Photocatalysts

以钛酸四丁酯为钛的前驱体,三聚氰胺为氮源,分别以溶胶凝胶及物理混合法制备g-C_3N_4/TiO_2复合纳米光催化材料,采用X射线衍射、傅里叶红外光谱、紫外-可见漫反射对催化材料的物相结构、官能团、光吸收性能等进行表征。结果表明,g-C_3N_4与TiO_2物理混合比例为0.1时制得的g-C_3N_4/TiO_2活性较高,经8 h光照,可使次甲基蓝脱色率达到62.62%。

g-C3N4/TiO2 photocatalytic composite was prepared by the sol-gel method and physical mixing method using four tetrabutyl titanate as the precursor of titanium, and melamine was used as nitrogen source. The as prepared photocatalysts were characterized by X-ray diffraction（XRD）, UV-Vis diffuse reflectance absorption spectroscopy（DRS） and Fourier transform infrared spectroscopy（FTIR）. The results show that the activity of g-C3N4/TiO2 obtained by physical mixing is relatively high when mass ratio of m（g-C3N4）： m（TiO2） is equal to 0.1, and the Degradation ratio of methylene blue can be up to 62.62% by 8 h illumination.