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Application of high resolution X-ray emission spectroscopy on the study of Cr ion adsorption by activated carbon
Fernando R Espinoza-Quiñones1, Aparecido N Módenes, Adriana S Câmera
1Postgraduate Program of Chemical Engineering, NBQ, Paraná West State University, Rua da faculdade 645, 85903-000 Toledo, Paraná, Brazil. f.espinoza@terra.com.br
Abstract:
In this work granular activated carbon has been chosen as an absorbent in order to investigate the Cr(VI) reduced by adsorption experiments. Several batch chromium-sorption experiments were carried out using 0.25 g of granular activated carbon in 50 mL aqueous solution containing approximately 70 and 140 mg L(-1) of Cr(VI) and Cr(III), respectively. Cr-Kbeta fluorescence spectra of Cr adsorbed in a carbon matrix and Cr reference materials were measured using a high-resolution Johann-type spectrometer. Based on evidence from the Cr-Kb satellite lines, the Cr(VI) reduction process has actually happened during metal adsorption by the activated carbon.
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