X-ray absorption spectroscopy investigation of surface redox transformations of thallium and chromium on colloidal mineral oxides

Details X-ray absorption spectroscopy investigation of surface redox transformations of thallium and chromium on colloidal mineral oxides X-ray absorption spectroscopy investigation of surface redox transformations of thallium and chromium on colloidal mineral oxides

May 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993gecoa..57.2389b&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 57, Issue 10, pp.2389-2394

Physics

7

Scientific paper

Examination of the adsorption mechanism of Tl and Cr on selected mineral oxides was carried out by X-ray Absorption Spectroscopy (XAS) using synchrotron radiation. Information on the oxidation states of surface bound species was obtained from the low energy side of XAS spectra, the XANES (X-ray Absorption Near Edge Structure) region. Surface precipitation of Tl 2 O 3 (s) was found to take place on -MnO 2 (s) as a result of T1(I) sorption and oxidation at the mineral surface. Adsorption of chromates on -FeOOH (s) containing very small amounts of ferrous ions was observed to be followed by partial reduction to Cr(III).

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