Computer Science
Scientific paper
Feb 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989gecoa..53..255r&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 53, Issue 2, pp.255-267
Computer Science
10
Scientific paper
Adsorption of gold by As 2 S 3 and Sb 2 S 3 sols (125 mg kg -1 ) from solutions containing 5.07 · 10 -7 m gold as hydrosulphidogold(I) complexes has been measured in the pH range 2 to 6 at 25°C and 2 to 9 90°C. Adsorption varied from 100 percent in acid solutions having pH < 4.5 down to 25-percent in neutral to alkaline solutions at 25 and 90°C. Adsorption by Sb 2 S 3 sols in the pH range 2 to 6 at 25°C and at 0.00, 0.10, 0.25, 0.50, and 1.0 m NaCl demonstrated no significant effect as a result of increasing ionic strength. The adsorption density (mol kg -1 of gold on the dry adsorbent) for As 2 S 3 at pH 4.6 and Sb 2 S 3 at pH 4.6 and 5.6 at 25°C was measured after equilibration with solutions containing 0.00 to 2.6·10 -6 m gold as hydrosulphido-complexes. The experimental data were interpreted using Langmuir and Freundlich adsorption equations. The data indicated apparent surface saturation concentrations for gold, as defined by the Langmuir equation, of 0.096 mol kg -1 for As 2 S 3 at pH 4.6 and 0.024 and 0.032 mol kg -1 for Sb 2 S 3 at pH 4.6 and 5.6. The surface charge on colloidal As 2 S 3 and Sb 2 S 3 particles at 25, 45, 70, and 90°C based on the adsorption of H + and OH - , was determined by potentiometric titration. Both sulphides were found to have a neutral surface, pH zpc , between pH 2.5 and 3.5 from 25 to 90°C.
Renders P. J.
Seward Terry M.
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