The mechanism of Fe (III)-catalyzed ozonation of phenol.
Fe (III)-catalyzed ozonation yielded better degradation rate and extent of COD (Chemical Oxygen Demand) or oxalic acid as compared with oxidation by ozone alone. Two parameters with strong effects on the efficiency of ozonation are pH of the solution and the catalyst (Fe(3+)) dosage. The existence of a critical pH value determining the catalysis of Fe (III) in acid conditions was observed in phenol and oxalic acid systems. The best efficiency of catalysis was obtained at a moderate concentration of the catalyst. A reasonable mechanism of Fe (III)-catalyzed ozonation of phenol was obtained based on the results and literature.
Zhu
Xiang-Feng
XF
Department of Environmental Engineering, Zhejiang University, Hangzhou 310027, China. hanota@sohu.com
Xu
Xin-Hua
XH
D019149:Bioreactors; D002384:Catalysis; D006863:Hydrogen-Ion Concentration; D007501:Iron / Q000737:chemistry*; D007700:Kinetics; D019815:Oxalic Acid / Q000737:chemistry; D010084:Oxidation-Reduction; D010126:Ozone / Q000737:chemistry*; D019800:Phenol / Q000737:chemistry* / Q000302:isolation & purification*; D014874:Water Pollutants, Chemical / Q000302:isolation & purification*; D018508:Water Purification / Q000379:methods*
D014874:Water Pollutants, Chemical; D019800:Phenol; D010126:Ozone; D019815:Oxalic Acid; D007501:Iron