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Citation: DING Shi-Min, FENG Xiang-Hua, WU Feng, DENG Nan-Sheng, Nikolai Bazhin. Photo-induced Simultaneous Reduction of Cr(Ⅵ) and Oxidation of Orange Ⅱ in Water[J]. Chinese Journal of Applied Chemistry, ;2005, 22(8): 813-817. shu

Photo-induced Simultaneous Reduction of Cr(Ⅵ) and Oxidation of Orange Ⅱ in Water

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a College of Resources and Environmental Science, Wuhan University, Wuhan 430072;
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b Department of Chemistry, Fuling Normal College, Chongqing;
c Institute of Chemical Kinetics and Combustion; ul.
c Institute of Chemical Kinetics and Combustion, ul.Institutskaya 3, Novosibirsk, 630090 Russia

Corresponding author: DENG Nan-Sheng,
Received Date: 13 October 2004
Available Online: 2 December 2004
Fund Project: 国家自然科学基金资助项目(20177017) (20177017)中-俄(NSFC-RFBR)协议项目(2004-2005) (NSFC-RFBR)协议项目(2004-2005)

Simultaneous treatment of Cr(Ⅵ) and OrangeⅡ in wastewater was investigated with a metal halide lamp as light source.The affecting factors on the photoreaction were discussed,including pH and the initial concentrations of Cr(Ⅵ) and OrangeⅡ.The reaction mechanism was preliminarily studied.Under the irradiation of the metal halide lamp,the photoreduction of (Cr(Ⅵ)) and photooxidation of Orange occurred simultaneously in wastewater mixtures.It is beneficial to the treatment of Cr(Ⅵ) and OrangeⅡ to increase the concentrations of Cr(Ⅵ) and Orange.The photoreduction rate of (Cr(Ⅵ)) and the discoloration rate of Orange increase with increasing acidity.The higher the concentration of Cr(Ⅵ),the lower the photoreduction rate of Cr(Ⅵ).The higher the initial rate,the higher the discoloration rate of OrangeⅡ;the higher the concentration of Orange,the higher the photoreduction rate of (Cr(Ⅵ)),the discoloration rate of Orange and the initial rate.Orange is the dominant species influencing the reaction rate.The reaction mechanism may be that Orange is activated by absorbing energy first,and then reacts with Cr(Ⅵ) via redox.Simultaneous treatment of Cr(Ⅵ) and organic compounds in water can be induced by UV-Vis light.These findings suggest that the method may be a new approach to remove high valent heavy metals and organic compounds simultaneously.
- dye,
- Orange Ⅱ,
- chromium,
- photoreduction,
- photodegradation
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