Adsorption of arsenic by hybrid anion–exchanger based on titanium oxyhydrate

The article has investigated the removal of anion–exchange forms of As(V) by organic anion–exchangers Dowex Marathon 11, Dowex SBR-P and organoinorganic anion–exchangers containing titanium oxyhydrate, from 0.2–2.0 mM solutions of NaH2AsO4 in the range of equilibrium values pH 3–10. It has been found that introduction of an inorganic component in the amount of 7 fractions of total mass, % results in non-additive (up to 50 fractions of total mass, %) increase of absorption of ions of As(V) in adsorption from weakly alkaline solutions. It was assumed that nonadditive change of the value of absorption may be caused by the influence of the negative charge of the surface of oxide component of organic anion–exchangers. It is shown that in acid media and also at an increase of the amount of the introduced titanium oxyhydrate the values of adsorption and distribution coefficient of As(V) ions approaches additive ones.