“…As a consequence, As concentration in natural aqueous environments is essentially controlled by interactions with mineral surfaces. Composite oxides have also been developed to enhance their efficiency as oxidants and adsorbents for both As(III) and As(V) (Chakravarty et al, 2002;Feng et al, 2006a;Ma et al, 2020;McCann et al, 2018;Wu et al, 2018;Ying et al, 2012;Zhang et al, 2007;Zhang et al, 2018;Zheng et al, 2020). Manganese (Mn) oxides can also oxidize As(III) (Manning et al, 2002;Scott and Morgan, 1995), as reported in natural lacustrine environments (Oscarson et al, 1980(Oscarson et al, , 1981a(Oscarson et al, , 1981b, and Mn oxides have a key role in As geochemical cycling (Driehaus et al, 1995;Nesbitt et al, 1998;Scott and Morgan, 1995;Tournassat et al, 2002).…”