Adsorption affinity of anions on metal oxyhydroxides

The dependences of anion (phosphate, carbonate, sulfate, chromate, oxalate, tartrate, and citrate) adsorption affinity anions from geometric characteristics, acid-base properties, and complex forming ability are generalized. It is shown that adsorption depends on the nature of both the anions and the ionic medium and adsorbent. It is established that anions are generally grouped into the following series of adsorption affinity reduction: PO 4 3− , CO 3 2− > C 2 O 4 2− , C(OH)(CH 2 ) 2 (COO) 3 3− , (CHOH) 2 (COO) 2 2− > CrO 4 2− ≫ SO 4 2− .