As(iii) removal through catalytic oxidation and Fe(iii) precipitation

Abstract

To remove arsenite (As(III)) from wastewater effectively, the catalytic oxidation of As(III) to arsenate (As(V)) and As(V) precipitation with iron ions (Fe(III)) was investigated. The Pt/SiO₂ catalyst functioned as a reaction site for As(III) with oxygen in the atmosphere. The combination of the Pt/SiO₂ catalyst and Fe(III) precipitant improved the removal of As(III) in the precipitate; Pt/SiO₂ worked as both an As(III) oxidation site and precipitation site with Fe(III) precipitant.