Experimental study of cadmium-citrate co-adsorption onto α-Al2O3

Details Experimental study of cadmium-citrate co-adsorption onto α-Al2O3 Experimental study of cadmium-citrate co-adsorption onto α-Al2O3

Aug 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996gecoa..60.2929b&link_type=abstract

Geochimica et Cosmochimica Acta, Volume 60, Issue 16, p. 2929-2938.

Computer Science

2

Scientific paper

An experimental investigation of metal-organic co-adsorption was conducted using cadmium and citrate in the presence of corundum. The experiments were performed in the pH range 3.0 to 10.0 in a 0.01 M NaCl matrix with citrate: Cd ratios of 0.00 and 10.00. The presence of citrate enhances cadmium adsorption between pH 3.5 and 7.2, and reduces it above pH 7.2. The results from the experiments provide constraints on the thermodynamic properties of the surface complexes. We model the adsorption of Cd by quantifying the competition between aqueous CdCit-1 and the surface species, >AlCitCd0, >AlOCd+, and >AlOCdCl0. The experimentally determined equilibrium constants provide a means to predict Cd mobilities in groundwater systems by describing the relative stabilities of surface and aqueous metal-organic complexes as a function of metal-to-ligand and solute-to-sorbent ratios.

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