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).
Jeong
Joonseon
J
School of Chemical Engineering, College of Engineering, Seoul National University, San 56-1, Sillim-dong, Gwanak-gu, Seoul 151-742, South Korea.
Yoon
Jeyong
J
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