Catalytic Ozonation of Reactive Black 5 Over Silver–Cobalt Composite Oxide Catalyst

Abstract

Catalytic ozonation was carried out using the silver–cobalt composite catalyst. Co-precipitation method was followed for the preparation of the catalyst, and characterization of the catalyst was carried out by XRD, BET and SEM with EDX. The percentage of total organic carbon removal was 75% employing silver–cobalt composite catalyst with ozonation, against 34% employing ozonation without any catalyst. The parameters such as amount of catalyst, initial concentration of the dye, ozone flow rate and the solution pH were found to affect the catalytic ozonation process. Degradation mechanism identified employing hydroxyl radical scavenger. The cyclic use of the synthesized catalyst indicated that the catalytic activity of Ag–Co–O is not much deteriorated after three cycles. Further, the kinetic suggests pseudo-first-order kinetics for the process.