Dual roles of CO2*- for degrading synthetic organic chemicals in the photo/ferrioxalate system.
In this study, the relative importance of the dual reaction pathways of CO2*- in the photo/ferrioxalate system, where it acts both as a reductant for reducing the ferric ion and as an agent for the formation of H(2)O(2), was investigated as a function of the concentrations of ferrioxalate and oxygen. We studied the two competitive reactions of CO2*- in the photo/ferrioxalate system, which depend on the relative concentrations of ferrioxalate to oxygen, with the degradation of 2,4-dichlorophenoxyacetic acid (2,4-D), which was used as a target pollutant. At high concentrations of ferrioxalate, almost all of the CO2*- reacted with ferrioxalate to reduce Fe(III) to Fe(II), whereas at low concentrations of ferrioxalate, a majority of the CO2*- contributed to the formation of H(2)O(2), as a result of its reaction with oxygen, which allows the Fenton reaction to occur without any external supply of H(2)O(2).
School of Chemical Engineering, College of Engineering, Seoul National University, San 56-1, Sillim-dong, Gwanak-gu, Seoul 151-742, South Korea.
Joonseon
J
Jeong
Jeyong
J
Yoon
D002245:Carbon Dioxide / Q000737:chemistry*; D006861:Hydrogen Peroxide / Q000032:analysis*; D010070:Oxalates / Q000737:chemistry*; D016877:Oxidants / Q000032:analysis*; D010084:Oxidation-Reduction; D010777:Photochemistry; D014865:Waste Disposal, Fluid; D018508:Water Purification / Q000379:methods*
D010070:Oxalates; D016877:Oxidants; D002245:Carbon Dioxide; C034942:ferrioxalate; D006861:Hydrogen Peroxide