Other
Scientific paper
Mar 1959
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1959gecoa..15..305h&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 15, Issue 4, pp.305-308
Other
8
Scientific paper
The adsorption of copper by various clay minerals, and also by quartz and calcite. was studied experimentally at different pH-values and concentrations. The clay minerals used were grain size fractions with an equivalent diameter < 2 or < 0.6 of two kaolinites, one fireclay type kaolinite, two illites and two montmorillonites. The surface properties of these samples were determined in part in electron micrographs and by the glycol-retention method. Copper is adsorbed by clay minerals and by quartz according to the Freundlich adsorption isotherm whereas in the case of calcite a chemical reaction takes place. The adsorption capacity of the clay minerals is increased by raising the pH as well as the copper concentration. The influence of concentration and pH-value is most pronounced with the kaolinites, there is only a small influence with the montmorillonites. The adsorption capacity related to 100 g of clay increases in the following order: kaolinite, fireclay type kaolinite, illite, montmorillonite. However, the adsorption capacity related to 100 m 2 surface of kaolinite and fireclay type kaolinite are of the same order of magnitude, the adsorption capacity per surface unit for illite and montmorillonite can be considerably smaller under certain conditions. The significance of such adsorption for geochemical processes is briefly discussed.
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