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Citation: WU Feng, ZHU Fan, DENG Nan-Sheng, XIANG Wu. Decolorization of OrangeⅡ Induced by Photolysis of Fe(Ⅲ)-Citrate Complex in Aqueous Solution[J]. Chinese Journal of Applied Chemistry, ;2004, 21(6): 546-550. shu

Decolorization of OrangeⅡ Induced by Photolysis of Fe(Ⅲ)-Citrate Complex in Aqueous Solution

WU Feng ^a,, ,
ZHU Fan ^a ,
DENG Nan-Sheng ^a ,
XIANG Wu ^b

1.
a Department of Environmental Science, Wuhan University, Wuhan 430072;
2.
b Institute of Geo-chemistry, China University of Geosciences, Wuhan

Corresponding author: WU Feng,
Received Date: 29 July 2003
Available Online: 2 November 2003
Fund Project: 国家自然科学基金项目资助(40201045,20177017) (40201045,20177017)

The formation of hydroxyl radicals on photolysis of Fe(Ⅲ)-citrate complex in aqueous solution was identified by using benzene as scavenger. The decolorization of an azo dye Orange Ⅱ in aqueous solution was then investigated in the presence of Fe(Ⅲ)-citrate complex. The results indicate that a solution of 8 mg/L OrangeⅡ could be decolorized with an efficiency of 60%~70% under the illumination with a high-pressure mercury lamp(125 W, λ≥365 nm) in an hour. The decolorization of dye at the concentration ranged in 8~50 mg/L was in accordance with pseudo-first order law reaction, and the decolorization rate decreased with increase of the initial dye concentration. The comparatively higher decolorization efficiency was achieved at pH values of 4~6. At a given concentration of ferric ions, the decolorization was faster when the Fe(Ⅲ)/citrate ratio was less 1, and the decolorization efficiency increased with increase of the citrate ions.
- Fe(Ⅲ)-citrate complex,
- Orange Ⅱ,
- photodegradation,
- decolorization
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