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X-ray Absorption Spectroscopy Study on Surface Interaction of Arsenite onto Two-Line Ferrihydrite at pHs 4 and 10
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 Title & Authors
X-ray Absorption Spectroscopy Study on Surface Interaction of Arsenite onto Two-Line Ferrihydrite at pHs 4 and 10
Lee, Woo-Chun; Choi, Sun-Hee; Cho, Hyen-Goo; Kim, Soon-Oh;
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X-ray absorption spectroscopy (XAS) study was conducted using arsenite-sorbed two-line ferrihydrite to investigate the mechanism of surface interactions between two-line ferrihydrite and As(III) (arsenite) which are ubiquitous in nature. The two-line ferrihydrite used was synthesized in the laboratory and the study was undertaken at pHs 4 and 10 to compare the difference in mechanisms of surface interaction between acidic and alkaline environments. The effect of arsenite-adsorbed concentrations on surface complexation was investigated at each pH condition as well. From the results of XAS analyses, the structural parameters of arsenite in the EXAFS revealed that the coordination number and distanceof As-O were 3.1~3.3 and 1.74~1.79 , respectively, which indicate that the unit structure of arsenite complex formed on the surface of two-line ferrihydrite is . The dominant structures of As(III)-Fe complex were examined to be bidentate binuclear comer-sharing () and the mixture of bidentate mononuclear edge sharing () and appeared as well. At pH 4, arsenite complex showed different structures on the surface of two-line ferrihydrite, depending on the adsorbed concentrations. At pH 10, on the contrary, the surface structures of arsenite complexes were interpreted to be almost identical, irrespective of the adsorbed concentrations of arsenite. Consequently, this microscopic XAS results support the results of macroscopic adsorption experiments in which the surface interaction between arsenite and two-line ferrihydrite is significantly influenced by pH conditions as well as arsenite concentrations.
As(III) (arsenite);two-line ferrihydrite;surface complexation;X-ray absorption spectroscopy (XAS);
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