“…The ions with smaller hydrated radii easily enter the pores of exchange material, resulting in higher adsorption [23]. The similar results were observed in the case of Zr(IV) iodovanadate, stannic(IV) selenosilicate, stannic(IV) silicomolybdate and stannic(IV) selenoiodate [14,22,24]. The material can be regenerated by keeping it in 1.0 M nitric acid and used over and over again.…”