In this paper, the treatment of phenol-containing wastewater is studied by using UV/H 2O 2 system in a bench scale. The influence factors including concentration of H 2O 2 and phenol, pH, and some metal ions are inves...In this paper, the treatment of phenol-containing wastewater is studied by using UV/H 2O 2 system in a bench scale. The influence factors including concentration of H 2O 2 and phenol, pH, and some metal ions are investigated. The addition of H 2O 2 was favorable to the removal of phenol, however, the excess of H 2O 2 does not significantly affect the removal efficiency. It has shown that changes in reaction rates are rather insignificant over a wide pH range from 3 to 8. The co-existence of metal ions has significant influence upon the photocatalytic reaction rates, Fe 2+ increases the reaction rates, but Co 2O 3 and Zn 2+ given negative results. The mechanism of the reaction process is also discussed with chromatograms of phenol and its intermediate products.展开更多
The Gd3+-doped TiO2 photocatalyst was prepared by the sol-gel and impregnation method. The effect of Gd3+ doping on crystalline size, BET surface area and photocatalytic activity was studied by XRD, FTIR, BET, UV-Vis ...The Gd3+-doped TiO2 photocatalyst was prepared by the sol-gel and impregnation method. The effect of Gd3+ doping on crystalline size, BET surface area and photocatalytic activity was studied by XRD, FTIR, BET, UV-Vis diffuse reflection spectroscopy, surface photovoltage spectroscopy (SPS). The activities of TiO2 and Gd3+-doped TiO2 catalysts for photocatalytic degradation of ethylene were studied by means of in situ FTIR. The photocatalytic reaction rate constant of ethylene becomes larger through Gd3+ doping. The rate constant of TiO2 was k1=8.51×10-4 min-1, while that of Gd/TiO2 was k2=1.85×10-3 min-1. At the same time, the yield of CO2 increased with Gd3+ doping. The enhancement in photocatalytic activity is probably due to the increase of light absorption, higher content of anatase, smaller crystal line size and higher specific surface area. In addition, the higher photocatalytic activity of Gd3+-doped TiO2 might be attributed to the effective separation of photo-generated electron-hole pairs.展开更多
文摘In this paper, the treatment of phenol-containing wastewater is studied by using UV/H 2O 2 system in a bench scale. The influence factors including concentration of H 2O 2 and phenol, pH, and some metal ions are investigated. The addition of H 2O 2 was favorable to the removal of phenol, however, the excess of H 2O 2 does not significantly affect the removal efficiency. It has shown that changes in reaction rates are rather insignificant over a wide pH range from 3 to 8. The co-existence of metal ions has significant influence upon the photocatalytic reaction rates, Fe 2+ increases the reaction rates, but Co 2O 3 and Zn 2+ given negative results. The mechanism of the reaction process is also discussed with chromatograms of phenol and its intermediate products.
文摘The Gd3+-doped TiO2 photocatalyst was prepared by the sol-gel and impregnation method. The effect of Gd3+ doping on crystalline size, BET surface area and photocatalytic activity was studied by XRD, FTIR, BET, UV-Vis diffuse reflection spectroscopy, surface photovoltage spectroscopy (SPS). The activities of TiO2 and Gd3+-doped TiO2 catalysts for photocatalytic degradation of ethylene were studied by means of in situ FTIR. The photocatalytic reaction rate constant of ethylene becomes larger through Gd3+ doping. The rate constant of TiO2 was k1=8.51×10-4 min-1, while that of Gd/TiO2 was k2=1.85×10-3 min-1. At the same time, the yield of CO2 increased with Gd3+ doping. The enhancement in photocatalytic activity is probably due to the increase of light absorption, higher content of anatase, smaller crystal line size and higher specific surface area. In addition, the higher photocatalytic activity of Gd3+-doped TiO2 might be attributed to the effective separation of photo-generated electron-hole pairs.
