Equilibrium modeling of As(III,V) sorption in the absence/presence of some groundwater occurring ions by iron(III)-cerium(IV) oxide nanoparticle agglomerates: A mechanistic approach of surface interaction

A pictorial representation of As(III)-sorption mechanism taking place under sufficient time lag is attributed to the oxidizing nature of Cerium (IV) in acidic medium. Cerium (IV) by virtue of its high standard reduction potential value (Ce4+/Ce3+ = 1.72) in acidic medium oxidizes the surface sorbed As(III) to As(V) (As3+/As5+ = 0.56) itself getting reduced to Ce3+ according to the underlying red ox reaction. As3++2Ce4+=As5++2Ce3+.