The catalytic oxidation of malachite green by the microwave-Fenton processes.
Catalytic oxidation of malachite green using the microwave-Fenton process was investigated. 0% of malachite green de-colorization using the microwave process and 23.5% of malachite green de-colorization using the Fenton process were observed within 5 minutes. In contrast 95.4% of malachite green de-colorization using the microwave-Fenton was observed in 5 minutes. During the microwave-Fenton process, the optimum operating conditions for malachite green de-colorization were found to be 3.40 of initial pH, 0.08 mmol/L of Fe2+ concentration and 12.5 mmol/L of H2O2 concentration. Confirmatory tests were carried out under the optimum conditions and the COD removal rate of 82.0% and the de-colorization rate of 99.0% were observed in 5 minutes. The apparent kinetics equation of -dC/dt=0.0337 [malachite green]0.9860[Fe2+)]0.8234[H2O2]0.1663 for malachite green de-colorization was calculated, which implied that malachite green was the dominant factor in determining the removal efficiency of malachite green based on microwave-Fenton process.
Zheng
Huaili
H
Key Laboratory of the Three Gorges Reservoir Region's Eco-Environment, State Ministry of Education, Chongqing University, Chongqing 400045, China. ZHL6512@126.com
Zhang
Huiqin
H
Sun
Xiaonan
X
Zhang
Peng
P
Tshukudu
Tiroyaone
T
Zhu
Guocheng
G
D002384:Catalysis; D002681:China; D006861:Hydrogen Peroxide / Q000737:chemistry*; D007501:Iron / Q000737:chemistry*; D007700:Kinetics; D008872:Microwaves; D015394:Molecular Structure; D010084:Oxidation-Reduction; D012394:Rosaniline Dyes / Q000032:analysis* / Q000528:radiation effects; D013056:Spectrophotometry, Ultraviolet; D014874:Water Pollutants, Chemical / Q000032:analysis* / Q000528:radiation effects; D018508:Water Purification / Q000379:methods*
C045076:Fenton's reagent; D012394:Rosaniline Dyes; D014874:Water Pollutants, Chemical; C005095:malachite green; D006861:Hydrogen Peroxide; D007501:Iron