Adsorption of Nitrilotriacetate (NTA), Co and CoNTA By Gibbsite

Abstract

Abstract Adsorption of Co 2+ nitrilotriacetic acid (NTA) and equal-molar Co 2+ and NTA by a low surface area (LSA) commercial gibbsite (3.5 m 2 g −1 ) was investigated in batch as a function of pH (4.5 to 10.5), adsorbate (0.5 to 10 µ M ) and adsorbent (0.5 to 75 g L −1 ) concentrations and ionic strength (0.01 to 1 M NaClO 4 ). The adsorption of Co 2+ (Co-only) and the acid form of NTA (NTA-only) by gibbsite in 0.01 M NaClO 4 exhibit cation-like and anion-like adsorption edges, respectively. For the equal-molar CoNTA chelate, Co and NTA adsorption edges were similar but not identical to the Co-only and NTA-only edges. Differences suggest the existence of a ternary CoNTA surface complex with the Co in the intact chelate coordinated to surface hydroxyls. NTA-only adsorption was insensitive to ionic strength variation, indicating weak electrostatic contributions to surface coordination reactions. This is consistent with the formation of inner-sphere surface NTA complexes and ligand exchange reactions in which monodentate, bidentate and binuclear NTA surface complexes form. Cobalt adsorption increases (edge shifts to lower pH by 1 pH unit) on LSA gibbsite as ionic strength increases from 0.01 to 1 M NaClO 4 . For the same ionic strength change, a similar shift in the Co-only edge was observed for another commercial gibbsite (16.8 m 2 g −1 ); however, no change was observed for δ-Al 2 O 3 . Ionic strength shifts in Co 2+ adsorption by gibbsite were described as an outer-sphere CoOH + surface complex using the triple-layer model. Results suggest that, at waste disposal sites where 60 Co and NTA have been co-disposed, NTA will not promote ligand-like adsorption of Co for acid conditions, but will reduce cation-like adsorption for basic conditions. Thus, where gibbsite is the dominant mineral sorbent, NTA will not alter 60 Co mobility in acidic pore waters and groundwaters; however, NTA could enhance 60 Co mobility where alkaline conditions prevail, unless microbial degradation of the NTA occurs.