Novel Magnetic Iron-Copper Nanocomposites as Photocatalysts for As(III) Oxidation

LUCIA MORAN AYALA; FRANCISCA APARICIO; LUCIANO CARLOS; GIULIANA MAGNACCA; GABRIELA BOSIO; DANIEL O. MARTIRE

Viñas del Mar

Congreso; XIV Encuentro Latinoamericano de Fotoquímica y Fotobiología (ELAFOT); 2019

Wehere employ magnetic iron and copper nanocomposites (NCs) as both adsorbentsand photocatalysts for the oxidation of As(III) to the less toxic As(V)species. The synthesis of the NCs was made by following the precursor method,using bio-Based Substances (BBS), which are humic-like compounds, isolated fromurban composting biowastes as complexing agents. Samples containing the NCs and3 mM As (III) were irradiated for 60 min in a RPR Rayonet reactor containing 8lamps with emission centered at 350 nm. The amount of As(V) determined by acolorimetric method was larger in the air-saturated than in the Ar-saturatedsamples. Laserflash-photolysis experiments show the broad absorptioncharacteristic of the formation of h+/e- uponirradiation. The reciprocal of the transient decay (t)increases with increasing concentration of As(III) up to 0.5 mM and thenreaches a plateau, indicating a reversible one-electron oxidation of As(III) byh+. The amount of total As and As(III) were evaluated afterirradiation of samples containing the NCs and As(III) to obtain information ofthe relative importance of the adsorption and photocatalysis routes for theremoval of As with our NCs under different conditions