Adsorption of Zn by Fe and Al Hydrous Oxides as Influenced by Aging and pH

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Abstract
Zinc solutions were equilibrated with both fresh and aged Fe and Al hydrous oxides to measure Zn adsorption. The data conformed to the Langmuir isotherm, and the Langmuir coefficients for Zn adsorption capacities and bonding energies were determined. The adsorption capacities for the aged Fe oxide (goethite) and the aged Al oxide (gibbsite) were the same. The adsorption capacities for both of the fresh oxides (amorphous) were about 10 times those for the aged oxides which corresponded to a 10‐fold difference between their respective CEC's and surface areas. The bonding energies for Zn for the fresh Al oxide were three times that for the fresh Fe oxide, but the bonding energies for the two aged oxides were the same. Bonding energies were directly related to adsorption capacities. The inflection points on the Zn adsorption vs. pH curves were between pH 5 and 6 for both oxides.

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