Oxidation of benzothiazole, 2-mercaptobenzothiazole and 2-hydroxybenzothiazole in aqueous solution by means of H2O2/UV or photoassisted Fenton systems

Oxidative treatments of benzothiazole and benzothiazole derivatives (2-merc aptobenzothiazole, 2-hydroxybenzothiazole) in aqueous solution have been st udied by using H2O2/UV and iron(III) photoassisted Fenton techniques. Exper imental runs have been carried out in the pH range 3.0-8.0 by means of annu lar reactors and proper UV lamps. The effect of pH, the initial concentrati on of hydrogen peroxide, the substrate, and the iron(III) concentrations ha ve been investigated. A suitable model has been developed and used for the best estimation of kinetic constants for HO radical attack on the target mo lecules with the H2O2/UV system. The values obtained with this model are co nsistent with those reported in the literature for other heterocyclic compo unds. (C) 2001 Society of Chemical Industry.