Kinetics of ozone decomposition and oxidation of a model organic compound in water

Abstract

The decomposition of ozone and oxidation of a model, polychlorinated organic compound, 2,3,4,5,6-pentachlorobiphenyl were studied. The parameters included self-decomposition of ozone at various pH values, mass transfer of ozone, and the rate of oxidation of 2,3,4,5,6-pentachlorobiphenyl. The decomposition of ozone follows a second-order reaction kinetics. Below pH 5, the rate of decomposition is not pH dependent and is slow. Above pH 5, the rate is pH sensitive and k o is specific to the ionic strength of the solution. The decomposition of 2,3,4,5,6-pentachlorobiphenyl follows pseudo-first-order reaction kinetics. The decomposition rate varies with temperature, ozone, and substrate concentration in a complex manner even though the dependence of the rate on ozone and substrate concentration is first-order dependent.