A review of catalytic ozonation:Mechanisms and efficiency

Interest in the use of catalytic ozonation has been steadily increasing as an effective process for total mineralization of organic contaminants and lower usage of ozone when compared with ozonation alone. Unfortunately,the mechanisms are always disputed due to the intricacy of crucial parameters and complexity of catalytic reactions during oxidation of organic molecules in aqueous solution. This paper presents a review of recent advances in catalytic ozonation to propose general ideas about mechanisms governing homogeneous and heterogeneous catalytic ozonation reactions. Heterogeneous catalyst compositions,factors affecting catalytic activity are summarized and advances in heterogeneous catalytic ozonation for degradation of model compounds and treatment of typical industrial wastewater are highlighted. The future work could focus on the relationship among catalyst, mechanism and degradation pathway of organic pollutants.