Phenol oxidation kinetics in water solution using iron(3)-oxide-based nano-catalysts

摘要

The influence of inorganic ions (HCO_3, PO_4/HPO_4/H_2PO_4, Cl, SO_4, Ca, Na and Mg) on the advanced chemical oxidation process of organic compounds dissolved in water is reported here. The catalytic behavior of iron(3)-oxide-based nano-particles was investigated together with inorganic ions and hydrogen peroxide concentrations, and pH level. Phenol was chosen as a typical organic contaminant for this study as a simulating pollutant. The limiting concentrations of radical scavengers making the oxidation process inefficient were identified. The strong effect of concentration of radical scavengers HCO_3, PO_4/HPO_4/ H_2PO_4, the nano-catalyst and hydrogen peroxide concentrations, and pH on the phenol oxidation rate and lag time period before reaction starts was determined. It was shown that Cl, SO_4 Ca, Na and Mg ions had no significant effect on the kinetics of phenol oxidation.