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- Title
Oxidation Degradation of Rhodamine B in Aqueous by UV/S<sub>2</sub>O<sub>8</sub><sup>2-</sup> Treatment System.
- Authors
Xiaoyang Chen; Zhiyong Xue; Yanlai Yao; Weiping Wang; Fengxiang Zhu; Chunlai Hong
- Abstract
The UV photolysis of persulfate (S2O82-) is a novel advanced oxidation technologies (AOTs), which leads to the formation of strong oxidizing radicals, sulfate radicals (SO4*-). The effect of oxidant S2O82- concentration, initial dye concentration, initial pH of solution, and various inorganic anions (Cl-, H2PO4 , and HCO3-) were investigated using Rhodamine B (RhB), a kind of xanthene dye, as a model pollutant. With the increase of oxidant S2O82-, more SO4*- produced to attack RhB molecules and result in the increase of RhB degradation. While the improvement was not sustained above a critical value, beyond which degradation rate does not increase. Initial pH of solution had great effect on the RhB degradation rate during UV/S2O82- system. SO4*- is rather stable in acidic solutions, while increasing system pH results in the transformation of SO4*- to *-OH. The effects of three inorganic anions (Cl-, H2PO4-, and HCO3-) all had some negative effect on the degradation of RhB. Based on the RhB solution changes of the UV-vis absorption intensity during the UV/S2O82- treatment, decolorization of RhB accompanied the destruction of aromatic ring structures of RhB molecules.
- Subjects
PHOTODEGRADATION; RHODAMINE B; ULTRAVIOLET photolysis; PERSULFATES; OXIDATION; XANTHENE dyes; RADICALS (Chemistry); AQUEOUS solutions
- Publication
International Journal of Photoenergy, 2012, p1
- ISSN
1110-662X
- Publication type
Article
- DOI
10.1155/2012/754691