Abstract
The adsorption of lactic acid, meso-tartaric acid,l-tartaric acid and citric acid onα-FeOOH and amorphous Fe(III)hydroxide was investigated by i.r. spectroscopy. The results indicate that adsorption is based on partial replacement of the surface hydroxyl groups by carboxylate groups. For meso-tartaric acid onα-FeOOH and for lactic acid andl-tartaric acid on amorphous Fe(III)hydroxide deprotonated alcoholic hydroxyl groups participate in the surface complex formation. A tentative model for the adsorption on the (100) face ofα-FeOOH is presented.
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