“…Photodegradation enhancement by 6 is linked to • OH generation by free and structural irons under Fe(II) and Fe(III) forms (Wu et al, 2008). In soil, clay-metal-HS complexes may also decrease photodegradation, because of Fe(III) efficiency as energy or charge acceptor (Rozen & Margulies, 1991;Mountacer et al, 2011). Furthermore, as HS, silicate surface may trap peroxy radicals and thus lessen the process on soil surfaces.…”