Zhou Wenjun, Shen Boxiong, Wang Fumei, Zhang Xiao, Zhao Zhong, Si Meng, Guo Shengqi
School of Energy and Environmental Engineering, Key Laboratory of Clean Energy Utilization and Pollutant Control in Tianjin, Hebei University of Technology, China.
School of Energy and Environmental Engineering, Key Laboratory of Clean Energy Utilization and Pollutant Control in Tianjin, Hebei University of Technology, China.
J Hazard Mater. 2020 Jun 5;391:121642. doi: 10.1016/j.jhazmat.2019.121642. Epub 2020 Feb 1.
To enhance the photocatalytic activity of TiO, a new preparation method has been proposed to synthesize the catalysts by introducing Cu-MOF as a precursor and performing a blackening process via a mixture with NaBH for TiO nanoparticles (CuO-TiO(mb)). The results showed that the removal efficiency of xylene under ultraviolet and visible light over CuO-TiO(mb) was 3.45 times higher than that of the catalysts prepared by impregnation of CuO on the surfaces of TiO (CuO-TiO(d)) and 12.12 times higher than that of pure TiO nanoparticles. Analyses by the X-ray diffraction, scanning electron microscopy, and transmission electron microscopy indicated that the introduction of Cu-MOF as a precursor on the surface of the catalyst resulted in CuO-TiO(mb) presenting a lower grain size compared with TiO nanoparticles and CuO-TiO(d). The results of X-ray photoelectron spectroscopy, diffuse reflectance spectrum and photoluminescence indicated that blackening process narrowed the bind gap width and shortened the band gap from 2.95 eV to 1.32 eV, introduced the coexistence of Ti, Ti, Cu and Cu in CuO-TiO(mb) decreased the recombination rate of e-h, which greatly improved the light response of CuO-TiO(mb) under ultraviolet and visible light, resulting in the benefit to the photocatalytic reaction.
为提高TiO的光催化活性，提出了一种新的制备方法，即通过引入Cu-MOF作为前驱体，并与NaBH混合对TiO纳米颗粒进行黑化处理来合成催化剂（CuO-TiO(mb)）。结果表明，在紫外光和可见光下，CuO-TiO(mb)对二甲苯的去除效率比通过在TiO表面浸渍CuO制备的催化剂（CuO-TiO(d)）高3.45倍，比纯TiO纳米颗粒高12.12倍。X射线衍射、扫描电子显微镜和透射电子显微镜分析表明，在催化剂表面引入Cu-MOF作为前驱体，使得CuO-TiO(mb)与TiO纳米颗粒和CuO-TiO(d)相比呈现出更小的晶粒尺寸。X射线光电子能谱、漫反射光谱和光致发光的结果表明，黑化处理缩小了结合能隙宽度，使带隙从2.95 eV缩短至1.32 eV，在CuO-TiO(mb)中引入了Ti、Ti、Cu和Cu的共存，降低了e-h的复合率，这极大地提高了CuO-TiO(mb)在紫外光和可见光下的光响应，有利于光催化反应。
