Advances in Heterogeneous Ozonation Catalysts and Their Applications in Industrial Wastewater Treatment
With the acceleration of industrialization,a large amount of refractory organic contaminants were discharged into water,bringing new challenges to the traditional water treatment technologies.As an advanced oxidation process(AOPs),the heterogeneous catalytic ozonation shows great potential for water treatment due to its high efficiency and environmental friendliness.The surface hydroxyl groups,Lewis acid sites,redox cycling,and structural defects could act as active sites on heterogeneous catalysts,which could effectively promote the ozonolysis reaction and generate reactive oxygen species(ROS)for enhancing the degradation of organic pollutants.By active site engineering,both the metal-based catalysts and non-metal catalysts could significantly improve the efficiency of ozonation reactions.This paper provides a comprehensive review of the use of heterogeneous catalytic ozonation in industrial wastewater treatment.The working mechanism of this technology,the active sites of catalysts,the typical catalysts and their applications in wastewater treatment were fundamentally discussed.Finally,this paper provides insights into the future research direction of heterogeneous catalytic ozonation,emphasizing the importance of establishing a unified catalyst evaluation standard and improving the catalyst stability for the practical application of the heterogeneous ozonation catalysts.
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