自支撑黑色TiO_2圆球的制备及其光催化性能的研究

Fabrication of self-supported black TiO_2 nanospheres and the related photocatalytic performance

为探索自支撑黑色Ti O2在可见光下降解有机污染物的催化性能,以粒径为385 nm的单分散白色Ti O2圆球为前驱体,再经H2氛500℃处理得到形貌尺寸未有明显改变的黑色Ti O2圆球。XRD和Raman结果表明黑色和白色Ti O2圆球的晶型为锐钛矿相;与白色Ti O2圆球相比,黑色Ti O2圆球的比表面积增大但是其带隙宽度降低为2.72 e V;黑色、白色Ti O2圆球和P25在可见光照下催化降解MB结果表明,黑色Ti O2圆球具有较好的催化活性,循环使用10次后,其催化活性没有明显衰减。

In order to explore the catalytic properties of self-supported black TiO2 in degradation of organic pollutants under visible light,black TiO2 nanospheres were obtained by calcination under the H2 atmosphere at 500℃,using monodisperse white TiO2 nano-spheres with diameter of 385 nm as the precursor. No significant changes in the morphology and size were observed between the pre-cursor and the resulted black TiO2 nanospheres. XRD and Raman results showed that black and white TiO2 nanospheres are typical anatase phase;compared with white TiO2 nanospheres,the specific surface area of black TiO2 nanospheres increased but its band gap reduced to 2. 72 eV. Results of photocatalytic degradation of MB under visible light catalyzed by black,white TiO2 balls and P25,respectively,showed that the black TiO2 nanospheres have better catalytic activity,and its catalytic activity does not attenuate obviously after cycling 10 times.