Degradation of trichloroethylene by Fe(II) chelated with cross-linked chitosan in a modified Fenton reaction.
Degradation of trichloroethylene (TCE) by a modified Fenton reaction was investigated in aqueous solution. Fenton reaction can be significantly enhanced in the presence of Fe(II) chelated by cross-linked chitosan (CS) with glutaraldehyde (GLA) at neutral pH. A remarkable oxidative degradation of TCE (1.838 h(-1)) was observed in the modified Fenton system with Fe(II)-CS/GLA (10 mM and 2 g L(-1), respectively) and H(2)O(2) (318 mM), while no significant degradation (0.005 h(-1)) was observed in the classic Fenton reaction system with Fe(II) (10 mM) and H(2)O(2) (318 mM) at pH 7 in 5 h. The kinetic rate constants for the degradation of TCE in the modified Fenton system was dependent on the initial suspension pH, Fe(II) loading, CS/GLA dosage, and concentration of H(2)O(2). We observed the formation of surface Fe(II)-CS/GLA complex using microscopic analyses and identified Fe oxidation (Fe(II) to Fe(III)) coupled with H(2)O(2) reduction on the Fe(II)-CS/GLA surfaces during the modified Fenton reaction.
Lee
Youngmin
Y
Department of Civil and Environmental Engineering, Korea Advanced Institute of Science and Technology, 373-1 Guseong-Dong, Yuseong-Gu, Daejon 305-701, Republic of Korea.
Lee
Woojin
W
D048271:Chitosan / Q000737:chemistry*; D003432:Cross-Linking Reagents; D006861:Hydrogen Peroxide; D006863:Hydrogen-Ion Concentration; D007501:Iron / Q000737:chemistry*; D007502:Iron Chelating Agents / Q000737:chemistry*; D007700:Kinetics; D008855:Microscopy, Electron, Scanning; D010084:Oxidation-Reduction; D014241:Trichloroethylene / Q000737:chemistry*
D003432:Cross-Linking Reagents; C045076:Fenton's reagent; D007502:Iron Chelating Agents; D014241:Trichloroethylene; D048271:Chitosan; D006861:Hydrogen Peroxide; D007501:Iron