Effect of Sulfate and Nitrate Anions on the Oxidative Degradation of Tetrachloroethylene by Magnetite with Glutathione

This work demonstrates the effect of sulfate (SO) and nitrate (NO)anions during the oxidative degradation of tetrachloroethylene (PCE) by magnetite (FeO) with glutathione. The enhanced of oxidative degradation of PCE was achieved due to the presence of SO and NO anions to form reactive radicals in the FeO-glutathione system. Kinetic rate constants for the oxidative degradation of PCE were accelerated 1.8 and 2.7 times higher, from 0.020 min in the PCE-FeO-glutathione to 0.036 and 0.054 min in the PCE-FeO-glutathione-NO and PCE-FeO-glutathione-SO systems respectively. The experimental results reveal that the oxidative degradation kinetic rate constant of PCE are strongly dependent on the presence of SO and NO radicals. Kinetic oxidative degradation rate constant of PCE increased proportionally as the concentrations of NO (0.036–0.120 min) and SO (0.0540–0.160 min) increased from 1 to 10 ppm at pH 7. The significant finding of this study is to provide the understanding of the oxidative degradation of PCE by FeO with glutathione in hyporheic zone and groundwater containing the SO and NO anions for the development of novel remediation technolojgies.