Magnetic amino-sulfonic dual sorbent for uranyl sorption from aqueous solutions – Influence of light irradiation on sorption properties

The association of magnetite microparticles with bi-functional amino-sulfonate polymer (obtained by condensation guanidine and amino hydroxynaphthalene sulfonic acid, mediated formaldehyde) allows synthesizing a magnetic composite sorbent (M−GANS). bearing both amine sulfonate groups is efficient for uranyl sorption at pH 4–5. isotherms are successfully fitted the Temkin equation, while kinetics controlled pseudo-first order rate equation. properties increased UV irradiation in terms capacity (by 25 %, up to 1.25 mmol U g−1) kinetics. occurs on groups; improvement under tentatively assigned photo-reduction species (mediated particles from layer). improves selectivity M−GANS uranium against other metal ions, tested synthetic real solutions. This can be correlated higher propensity photo-reduced compared investigated competitor ions. recycling was five successive cycles desorption (stably complete): loss performances slightly reduced (less than 1.5 % fifth cycle) experiments performed dark conditions (loss close 4.2 %). peroxide precipitate obtained end treatment acid leachate ore shows purity when applied.