Degradation of carbofuran in aqueous solution by ultrasound and Fenton processes: Effect of system parameters and kinetic study.
To establish an efficient oxidation process for carbofuran degradation, the effects of some operating parameters such as dosages of H(2)O(2), Fe(2+) and initial carbofuran concentrations were observed during carbofuran degradation by the ultrasound process, Fenton process and a combined ultrasound/Fenton process. The degradation kinetics of carbofuran was also examined based on the experimental data. The results show that more than 99% of the carbofuran was degraded by the ultrasound/Fenton process within short reaction time periods. Increased dosages of H(2)O(2) and Fe(2+) enhanced the degradation of carbofuran in the ultrasound and Fenton oxidation processes, but initial carbofuran concentrations decreased carbofuran degradation in both the Fenton and ultrasound/Fenton processes. The degradation kinetics of carbofuran by the three oxidation processes was found to be in accordance with first-order reaction kinetics. The results provide fundamental information about the treatment of carbofuran wastewater and/or other pesticides by the ultrasound/Fenton oxidation process.
Ma
Ying-Shih
YS
Department of Environmental Engineering and Health, Yuanpei University, Hsinchu, Taiwan. ysma0728@mail.ypu.edu.tw
Sung
Chi-Fanga
CF
Lin
Jih-Gaw
JG
D002235:Carbofuran / Q000737:chemistry*; D008401:Gas Chromatography-Mass Spectrometry; D006861:Hydrogen Peroxide / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D007202:Indicators and Reagents; D007501:Iron / Q000737:chemistry*; D007700:Kinetics; D012996:Solutions; D014465:Ultrasonics; D014867:Water
C045076:Fenton's reagent; D007202:Indicators and Reagents; D012996:Solutions; D014867:Water; D006861:Hydrogen Peroxide; D007501:Iron; D002235:Carbofuran