کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
583762 | 877876 | 2008 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Photocatalytic degradation of C.I. Direct Red 23 in aqueous solutions under UV irradiation using SrTiO3/CeO2 composite as the catalyst
دانلود مقاله + سفارش ترجمه
دانلود مقاله ISI انگلیسی
رایگان برای ایرانیان
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
بهداشت و امنیت شیمی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
The photocatalytic degradation of C.I. Direct Red 23 (4BS) in aqueous solutions under UV irradiation was investigated with SrTiO3/CeO2 composite as the catalyst. The SrTiO3/CeO2 powders had more photocatalytic activity for decolorization of 4BS than that of pure SrTiO3 powder under UV irradiation. The effects of catalytic dose, pH value, initial concentration of dye, irradiation intensity as well as scavenger KI were ascertained, and the optimum conditions for maximum degradation were determined. Under the irradiation of a 250Â W mercury lamp, the best catalytic dose was 1.5Â g/L and the best pH was 12.0. Light intensity exhibited a significant positive effect on the efficiency of decolorization, whereas the initial dye concentration showed a significant negative effect. Under the conditions of a catalytic dose of 1.5Â g/L, pH of 12.0, initial dye concentration of 100Â mg/L, light intensity of 250Â W, and air flow rate of 0.15Â m3/h, complete decolorization, as determined by UV-visible analysis, was achieved in 60Â min, corresponding to a reduction in chemical oxygen demand (COD) of 69% after a 240Â min reaction. A tentative degradation pathway based on the sensitization mechanism of photocatalysis is proposed.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Hazardous Materials - Volume 152, Issue 3, 15 April 2008, Pages 1301-1308
Journal: Journal of Hazardous Materials - Volume 152, Issue 3, 15 April 2008, Pages 1301-1308
نویسندگان
Shuang Song, Lejin Xu, Zhiqiao He, Haiping Ying, Jianmeng Chen, Xiuzhen Xiao, Bing Yan,