화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Journal of Industrial and Engineering Chemistry, Vol.80, 23-32, December, 2019
DOI10.1016/j.jiec.2019.07.027  Export Citation
Photocatalytic removal of chromium(VI) and sulfite using transition metal (Cu, Fe, Zn) doped TiO2 driven by visible light: Feasibility, mechanism and kinetics
Jinghong Zhang1, 2, Dong Fu1, 2, Shuqin Wang1, 2, †, Runlong Hao1, 2, †, and Yixiao Xie1, 2
  • 1Hebei Key Lab of Power Plant Flue Gas Multi-Pollutants Control, Department of Environmental Science and Engineering, North China Electric Power University, Baoding, 071003, PR China
  • 2bMOE Key Laboratory of Resources and Environmental Systems Optimization, College of Environmental Science and Engineering, North China Electric Power University, Beijing, 102206, PR China
E-mail:,
To cooperatively oxidize sulfite and reduce Cr(VI), this paper proposed a visible-light driven photocatalytic method, with using the photocatalysts of transition metals (Cu, Fe and Zn) doped TiO2. The photocatalysts were characterized by means of XRD, BET, SEM and UV-vis. 0.5Cu-TiO2 exhibited the best performance, and the existing forms of Ti and Cu were Ti4+/Cu+ and/or Cu-O-Ti. Cu-doping introduced an energy level of Cu 3d which was useful in decreasing the band gap and increasing the visible light utilization. Cu-doping also made the TiO2 grains well dispersed, increased the amount of hydroxyl group, decreased the grain size and increased the specific surface area, which facilitated the adsorption process. Hydrothermal method (8 h and 180 °C) favored the formation of anatase crystal. FT-IR results revealed that most of produced Cr(III) and sulfate were adsorbed onto the catalyst. Kinetics results suggested 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; the continual consumption of e- and h+ enhanced the separation of the h+-e- pairs.
Keywords:Visible light photocatalytic;Sulfite oxidation;Chromium(VI) reduction;Kinetics;Mechanism
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