Journal
SEPARATION SCIENCE AND TECHNOLOGY
Volume 39, Issue 8, Pages 1885-1905Publisher
TAYLOR & FRANCIS INC
DOI: 10.1081/SS-120030791
Keywords
oxidized carbon; transition metal sorption; selectivity; The Irving-Williams series; surface oxygen complexes
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Several active carbons derived from different precursors and oxidized by different techniques have been characterized by N-2 porosimetry and various titration methods. The adsorption of Cu2+, Ni2+, CO2+' Zn2+ and Mn2+ from aqueous solutions was studied using these carbons and carboxylic resin Purolite C104. The affinity series Mn2+ < CO2+ < Ni2+ < Cu2+ > Zn2+ established in adsorption experiments coincides with the Irving-Williams order and is independent of the method and extent of adsorbent oxidation, carbon precursor, porous structure, and type of adsorbent. Enhanced selectivity of adsorbents towards Cu2+ is related to the electronic structure of this ion.
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