Fig. 1. Influence of ligands on Ni sorption kinetics: (a) Ni sorption on low surface area gibbsite with different citrate/Ni ratios; (b) Ni sorption on low surface area gibbsite, high surface area gibbsite, and pyrophyllite in the presence and absence of citrate; (c) Ni sorption on low surface area gibbsite, high surface area gibbsite, and pyrophyllite in the presence and absence of salicylate