ArticleExperimental study of cadmium-citrate co-adsorption onto α-Al2O3
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2019, Journal of Colloid and Interface ScienceCitation Excerpt :Ionized organic molecules can affect the retention mechanism of metal cations by changing the surface charge, therefore creating new surface sites for adsorption of metal cations and/or allowing the formation of metal-ligand complexes anchored to the surface. As observed by Boily et al. [10], the addition of citrates enhanced the cadmium adsorption onto α-Al2O3 for pH between 3.5 and 7.2, whereas the metal adsorption was found to be reduced for pH above 7.2 paralleling the decrease in the citrate adsorption. Davis [11] reported that humic substances enhanced copper ion binding to alumina oxide at low pH (e.g., lower than 6) through the co-sorption mechanism, and decreased Cu(II) sorption at higher pH owing to the formation of nonsorbing aqueous complexes.
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Present address: Civil Engineering and Geological Sciences, University of Notre Dame, Notre Dame, IN 46556, USA.