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Surface-Induced Nickel Hydroxide Precipitation in the Presence of Citrate and Salicylate

^a Dep. of Biological and Environmental Engineering, Graduate School of Agricultural and Life Sciences, The University of Tokyo, 1-1-1 Yayoi, Bunkyo, Tokyo, 113-8657, Japan
^b Inst. of Terrestrial Ecology, ETHZ, CH-8952 Schlieren, Switzerland
^c Dep. of Plant and Soil Sciences, University of Delaware, Newark, DE 19717-1303

View larger version (24K): [in a new window]   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

View larger version (48K): [in a new window]   Fig. 2. Influence of ligands on the time-dependent formation of Ni precipitates as investigated by the 2 band position: (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

View larger version (23K): [in a new window]   Fig. 3. (a) Diffuse reflectance spectroscopy spectrum of Ni–Al layered double hydroxide, -Ni hydroxide, and physical mixture of -Ni hydroxide and Ni–Al layered double hydroxide. (b) Relationships between 2 band position and fraction of -Ni hydroxide vs. Ni–Al layered double hydroxide

View larger version (32K): [in a new window]   Fig. 4. (a) Citrate and (b) salicylate sorption on low surface area gibbsite, high surface area gibbsite, and pyrophyllite

View larger version (25K): [in a new window]   Fig. 5. Influence of Ni and ligands on the Al release from sorbents: (a) Al release from low surface area gibbsite at different citrate/Ni ratios; (b) Al release from low surface area gibbsite, high surface area gibbsite, and pyrophyllite in the presence of citrate; (c) Al and Si dissolution kinetics from pyrophyllite