Kinetic model of the ozone oxidation by-product bromate removal by nanoparticle zero iron

摘要

Bromate formation during ozone oxidation process is becoming a particular concern because it is a carcinogenic compound. Reduction by zerovalent iron shows a potential technique for the removal of bromate from water. A series of batch experiments were carried out using nanoparticle zero iron. A tentative reaction mechanism and the kinetic model for bromate reduction were discussed. It was found that the efficiency of bromate removal was affected by the amount of iron, initial concentration of bromate, pH, and reaction temperature. Bromate removal was based on pseudo-first-order reaction kinetics, assuming an irreversible surface reaction to be the rate-controlling step. The apparent activation energy for bromate reduction, in the temperature range of 283-303 K-,K- was found to be 23.2 kJ/mol.