Adsorption of carbon dioxide on goethite (α-FeOOH) surfaces, and its implications for anion adsorption

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Abstract
Carbon dioxide is strongly adsorbed as CO2– 3 on moist goethite surfaces, but as both CO2– 3 and HCO– 3 on dry surfaces. On the basis of a model of the surface, sites for the adsorption of the carbonate species are suggested where these ions would play a role in redistributing surface charge. A similar role is proposed for strongly adsorbed anions such as phosphate.