Fotocatálise eletroquímica de atrazina sobre dióxido de titânio: efeito de diferentes parâmetros experimentais

Abstract

Recebido em 13/9/02; aceito em 17/4/03 PHOTOELECTROCHEMICAL DEGRADATION OF ATRAZINA ON TITANIUM DIOXIDE: EFFECT OF DIFFERENT EXPERIMENTAL PARAMETERS. The atrazine photoelectrochemical degradation has been examined in solutions containing TiO 2 on immobilized films under a variety of experimental conditions. It was possible to observe that the supporting electrolyte nature affects the intensity of the photocurrent, being an indicative of the adsorption process. The disappearance of the organic molecule follows approximately a pseudo-first order kinetic. As mineralization product, NH 4 + and NO 3-ion have been identified. These results indicated that the formation of NH 4 + ion can be associated to the effect of atrazine adsorption, due to need of potential adaptation together with a variation in the supporting electrolyte concentration.