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Efficient photocatalytic removal of aqueous Cr(VI) by N-F-Al tri-doped TiO2
Shu Qin Wang,Yixiao Xie,Wei Liang Cheng,Jian Gao 한국화학공학회 2017 Korean Journal of Chemical Engineering Vol.34 No.9
As chromium is a common heavy metal contaminant in water, we have prepared N-F-Al tri-doped TiO2 catalyst for Cr(VI) removal under visible light. The sample was prepared via a sol-gel method and was characterized by XRD, BET, UV-vis DRS, XPS and SEM techniques. In the photocatalytic experiments, effects of Al/Ti ratio, F/Ti ratio, calcination temperature and different dopants were investigated. The optimum Al/Ti molar ratio, F/Ti ratio and calcination temperature proved to be 0.01, 0.1 and 500 oC, respectively, which is in accordance with the characterization analysis. Catalysts prepared under this condition showed a high photoactivity for Cr(VI) removal in water.
Jinghong Zhang,Dong Fu,Shu Qin Wang,Runlong Hao,Yixiao Xie 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.80 No.-
To cooperatively oxidize sulfite and reduce Cr(VI), this paper proposed a visible-light drivenphotocatalytic method, with using the photocatalysts of transition metals (Cu, Fe and Zn) dopedTiO2. The photocatalysts were characterized by means of XRD, BET, SEM and UV–vis. 0.5Cu-TiO2 exhibitedthe best performance, and the existing forms of Ti and Cu were Ti4+/Cu+ and/or Cu-O-Ti. Cu-dopingintroduced an energy level of Cu 3d which was useful in decreasing the band gap and increasing thevisible light utilization. Cu-doping also made the TiO2 grains well dispersed, increased the amount ofhydroxyl group, decreased the grain size and increased the specific surface area, which facilitated theadsorption process. Hydrothermal method (8 h and 180 C) favored the formation of anatase crystal. FT-IRresults revealed that most of produced Cr(III) and sulfate were adsorbed onto the catalyst. Kinetics resultssuggested that the rate constant for Cr(VI) removal was 5.05 10 3 min 1. The photo-produced electrons(e ) and holes (h+) contributed to the reduction of Cr(VI) and oxidation of sulfite, respectively; thecontinual consumption of e and h+ enhanced the separation of the h+-e pairs.