| 光谱学与光谱分析 |
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| Study on Apparent Kinetics of Photocatalytic Oxidation Degradation Rhodamine B by Photo-Fenton Reaction |
| LI Hong1,2,ZHENG Huai-li1*,LI Xiao-hong2,XIE Li-guo1,TANG Xue3 |
1. Key Laboratory of the Three Gorges Reservoir Region’s Eco-Environment, Ministry of Education，Chongqing University, Chongqing 400045, China
2. College of Resource and Environmental Science， Chongqing University，Chongqing 400044，China
3. College of Chemistry and Chemical Engineering，Chongqing University，Chongqing 400044，China |
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Abstract The Fenton process, mixed by hydrogen peroxide and iron salts with highly oxidative effect, is recognized as one of powerful advanced oxidation technologies available and can be used to destroy a variety of persistent organic pollutants. The oxidation power of Fenton reagent is due to the generation of hydroxyl radical (·OH) during the iron catalysed decomposition of hydrogen peroxide in acid medium. The hydroxyl radical with a high oxidation potential (2.8 eV) attacks and completely destroys the pollutants in Fenton process. The degradation of pollutants can be considerably improved by using sunlight radiation, which is due to the generation of additional hydroxyl radicals. This photo-Fenton process had been effectively used to degrade the pollutants. In this paper, the definite quantity of Fenton reagent was added in the definite concentration of Rhodamine B solution. The degradation reaction was carried out at pH 3.5 under natural sunlight. The factors influencing on photocatalytic oxidation degradation rate of Rhodamine B were studied following: the initial concentration of Rhodamine B, initial concentrateions of Fe2+ and H2O2. The orders of degradation reaction were obtained by solving exponential kinetics equations of curve fitting, thereby gaining the kinetic parameters and reaction dynamics equation of the reaction system. The research contents included mainly: the UV-Vis spectra of Rhodamine B solution, the concentration-absorbency work curve of Rhodamine B solution, the analysis of the reaction system at various initial Rhodamine B concentrations, the analysis of the reaction system at various initial Fe2+concentrateions, the analysis of the reaction system at various initial H2O2 concentrations, and the calculation of the apparent kinetics parameters in reaction dynamics equation. The reaction dynamics equation from experiments was constructed: V=5×10-9P1.28F0.366E0.920, and overall reaction order was 2.57.
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Received: 2007-06-06
Accepted: 2007-09-08
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Corresponding Authors:
ZHENG Huai-li
E-mail: zhenghl@cta.cq.cn
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[1] ZHENG Huai-li, XIANG Xin-yi(郑怀礼, 相欣奕). Spectroscopy and Spectral Analysis(光谱学与光谱分析), 2004, 24(6): 726.
[2] ZHENG Huai-li, PAN Yun-xia, XIANG Xin-yi. Journal of Hazardous Materials，2007, 141(3): 457.
[3] ZHU Hong-tao, ZENG Fang, XU Pei-yao(朱洪涛, 曾 芳, 许偑瑶). Techniques and Equipment for Environmental Pollutioo Control(环境污染治理技术与设备)，2003，4(6)：64.
[4] ZHANG Dao-bin，ZHANG Hui，ZENG Zhi-wu, et al(张道斌, 张 晖, 曾志武, 等). Techniques and Equipment for Environmental Pollution Control(环境污染治理技术与设备)，2006，7(2)：101.
[5] XIANG Xin-yi, ZHENG Huai-li(相欣奕, 郑怀礼). Journal of Chongqing Jianzhu University(重庆建筑大学学报), 2004, 26(4): 126.
[6] WANG Chun-min, LI Ya-feng, ZHOU Hong-xing, et al(王春敏, 李亚峰, 周红星, 等). Techniques and Equipment for Environmental Pollution Control(环境污染治理技术与设备)，2006，7(3)：88.
[7] ZHENG Huai-li, ZHANG Zhan-mei, TANG Ming-fang, et al(郑怀礼，张占梅，唐鸣放, 等). Spectroscopy and Spectral Analysis(光谱学与光谱分析), 2006, 26(4): 768.
[8] ZHENG Huai-li, ZHANG Jun-hua, XIONG Wen-qiang(郑怀礼, 张峻华, 熊文强). Spectroscopy and Spectral Analysis(光谱学与光谱分析), 2004，24(8): 1003.
[9] YANG Chun-guang, ZHAO Jing-li, YIN Xue-zhi, et al(杨春光, 赵景利, 殷学智, 等). Techniques and Equipment for Environmental Pollution Control(环境污染治理技术与设备)，2006，7(3)：105.
[10] LIU Guang-ming, ZHOU Xia, KONG Ling-ren, et al(刘光明, 周 霞, 孔令仁，等). Techniques and Equipment for Environmental Pollution Control(环境污染治理技术与设备)，2005，6(9)：58.
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