CexZr1 − xO2 mixed oxides applied to minimize the bromate formation in the catalytic ozonation of a filtered water

Several CexZr1 − xO2 mixed oxides were prepared and used as catalysts to investigate the minimization of BrO3− formation in the ozonation of a filtered water containing Br− in a batch reactor. The CexZr1 − xO2 mixed oxides showed good performance in reducing BrO3− formation and removing organic compounds. The Ce0.75Zr0.25O2 oxide exhibited the highest efficiency, and 53% BrO3− was reduced after 20 min reaction. The mixed oxides accelerated the decomposition of the dissolved O3 into OH radicals, and the competitive reaction between organic compounds and Br− with OH radicals was found to occur in the ozonation reaction.

► The CexZr1 − xO2 oxides are used to reduce the bromate formation in the ozonation.
► The oxides exhibit good performance in reducing the bromate formation and organics.
► The oxides accelerate the decomposition of O3 into OH radicals.
► The competitive reaction between organics and Br− with OH radicals is found.