Assessment of the Arsenic Removal From Water Using Lanthanum Ferrite

GARCÍA, FABIANA E.; LITTER, MARTA I.; SORA, ISABELLA NATALI

ChemistryOpen

Wiley

Año: 2021 vol. 10 p. 790 - 797

2191-1363

The catalytic performance of a perovskite-type lanthanumferrite LaFeO3 to remove arsenic from water has beeninvestigates for the first time. LaFeO3 was prepared by citrateauto-combustion of dry gel obtained from a solution of thecorresponding nitrates poured into citric acid solution. Kineticstudies were performed in the dark with As(V) and in the darkand under UV-C irradiation at pH 6?7 with As(III) (both1 mgL􀀀 1), and As: Fe molar ratios (MR) of 1:10 and 1:100 usingthe LaFeO3 catalyst. As(V) was removed from solution after60 min in the dark in 7% and in 47% for MR=1 :10 and MR=1: 100, respectively, indicating the importance of the amount ofthe iron material on the removal. Oxidation of As(III) in the darkwas negligible after 60 min in contact with the solid sample,but complete removal of As(III) was observed within 60 min ofirradiation at 254 nm, due to As(III) photooxidation to As(V) andto As(III) sorption to a minor extent. Morphological and microstructuralstudies of the catalyst complement the catalytictesting. This work demonstrates that LaFeO3 can be used forthe removal of As(III) from highly arsenic contaminated water.