论文部分内容阅读
Photocatalytic degradation of paraquat using mesoporous-assembled Cu-TiO2 /SBA15 under UV and visible light was investigated.The catalyst was synthesized by impregnation of Cu-TiO2 colloids onto SBA-15.The colloids of Cu-TiO2 were prepared via solgel method while the mesoporous support was prepared using hydrothermal technique.The catalyst was characterized using X-ray diffraction,nitrogen adsorption-desorption,transmission electron microscopy,UV diffuse reflectance spectroscopy,Zeta potential and X-ray adsorption spectroscopy.Results from characterizations showed that Cu doped TiO2 had a small crystalline size and was welldispersed on SBA-15.The inclusion of SBA-15 significantly enhanced the photocatalytic activity of the catalyst.Among the three types of undoped catalyst in this study (P25,TiO2,TiO_2 /SBA-15),TiO2 /SBA-15 yielded the highest degradation of paraquat for all pH under UV illumination.Meanwhile 2 wt.% Cu-TiO2 /SBA-15 yielded the highest activity under visible light.
Photocatalytic degradation of paraquat using mesoporous-assembled Cu-TiO2 / SBA15 under UV and visible light was investigated. The catalyst was synthesized by impregnation of Cu-TiO2 colloids onto SBA-15.The colloids of Cu-TiO2 were prepared via solgel method while the mesoporous support was prepared using hydrothermal technique. The catalyst was characterized using X-ray diffraction, nitrogen adsorption-desorption, transmission electron microscopy, UV diffuse reflectance spectroscopy, Zeta potential and X-ray adsorption spectroscopy. Results from characterizations showed that Cu doped TiO2 had a small crystalline size and was well dispersed on SBA-15. The inclusion of SBA-15 significantly enhanced the photocatalytic activity of the catalyst. Among the three types of undoped catalyst in this study (P25, TiO 2, TiO 2 / SBA- / SBA-15 yielded the highest degradation of paraquat for all pH under UV illumination. Mianwhile 2 wt.% Cu-TiO2 / SBA-15 yielded the highest activity under visible light.