Photocatalytic degradation of paraquat using nano-sized Cu-TiO₂/SBA-15 under UV and visible light

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• 作者：Maurice G. Sorolla II^a ; ^{mauricesorolla@yahoo.com} ; Maria Lourdes Dalida^a ; Pongtanawat Khemthong^b ; Nurak Grisdanurak^c ; ^{gnurak@engr.tu.ac.th}
• 关键词：paraquat ; photocatalysis ; titania ; SBA-15 ; copper-doped
• 刊名：Journal of Environmental Sciences
• 出版年：2012
• 期刊代码：8_10010742
• 类别：env
• 出版时间：June, 2012
• 卷：24
• 期：6
• 页码：1125-1132
• 文件大小：896 K

摘要

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 sol-gel 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, TiO₂, TiO₂/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.