Simple and efficient sonochemical method for the oxidation of arsenic(III) to arsenic(V)

Abstract

A simple and efficient sonochemical method has been developed for the oxidation of acutely toxic As(III) to the less toxic As(V). The OH radicals produced during acoustic cavitation readily oxidize As(III) to As(V) in an aqueous environment. The effects of various operational parameters of ultrasonication, such as power density and pulse mode, on the oxidation of As(III) were studied. Pulsed sonication showed a profound effect on the oxidation of As(III) to As(V) in comparison to the continuous mode of operation, that consequently reduced the reaction time and energy requirement for the process. Increasing acoustic amplitude led to an enhanced rate of oxidation of As(III). In the presence of..