title: Application of high resolution X-ray emission spectroscopy on the study of Cr ion adsorption by activated carbon.
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.
authors.affiliation: Postgraduate Program of Chemical Engineering, NBQ, Paraná West State University, Rua da faculdade 645, 85903-000 Toledo, Paraná, Brazil. f.espinoza@terra.com.br
authors.forename: Fernando R
authors.initials: FR
authors.lastname: Espinoza-Quiñones
authors.forename: Aparecido N
authors.initials: AN
authors.lastname: Módenes
authors.forename: Adriana S
authors.initials: AS
authors.lastname: Câmera
authors.forename: Guillermo
authors.initials: G
authors.lastname: Stutz
authors.forename: German
authors.initials: G
authors.lastname: Tirao
authors.forename: Soraya M
authors.initials: SM
authors.lastname: Palácio
authors.forename: Alexander D
authors.initials: AD
authors.lastname: Kroumov
authors.forename: Ana P
authors.initials: AP
authors.lastname: Oliveira
authors.forename: Vanessa L
authors.initials: VL
authors.lastname: Alflen