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Title (Primary) In situ and ex situ study of the enhanced modification with iron of clinoptilolite-rich zeolitic tuff for arsenic sorption from aqueous solutions
Author Dávila-Jiménez, M.M.; Elizalde-González, M.P.; Mattusch, J.; Morgenstern, P.; Pérez-Cruz, M.A.; Reyes-Ortega, Y.; Wennrich, R.; Yee-Madeira, H.
Journal Journal of Colloid and Interface Science
Year 2008
Department ANA
Volume 322
Issue 2
Page From 527
Page To 536
Language englisch
Keywords Clinoptilolite; Iron modification; Arsenic adsorption; Mössbauer spectroscopy; ESR spectroscopy; Zeolite impregnated electrode
Abstract Adsorption methods have been developed for the removal of arsenic from solution motivated by the adverse health effects of this naturally occurring element. Iron exchanged natural zeolites are promising materials for this application. In this study we introduced iron species into a clinoptilolite-rich zeolitic tuff by the liquid exchange method using different organic and inorganic iron salts after pretreatment with NaCl and quantified the iron content in all trials by XRF spectroscopy. The materials were characterized by XRD, FTIR, FTIR-DR, UV-vis, cyclic voltammetry, ESR and Mössbauer spectroscopies before and after adsorption of arsenite and arsenate. The reached iron load in the sample T + Fe was %Fe2O3-2.462, , using FeCl3, whereby the iron leachability was 0.1-0.2%. The introduced iron corresponded to four coordinated species with tetrahedral geometry, primarily low spin ferric iron adsorbing almost 12 µg g-1 arsenite (99% removal) from a 360 µgAs(III) L-1 and 6 µg g-1 arsenate from a 230 µgAs(V) L-1. Adsorption of arsenite and arsenate reached practically a plateau at in the series of exchanged tuffs. The oxidation of arsenite to arsenate in the solution in contact with iron modified tuff during adsorption was observed by speciation. The reduction of ferric iron to ferrous iron could be detected in the electrochemical system comprising an iron-clinoptilolite impregnated electrode and was not observed in the dried tuff after adsorption.
Persistent UFZ Identifier https://www.ufz.de/index.php?en=20939&ufzPublicationIdentifier=875
Dávila-Jiménez, M.M., Elizalde-González, M.P., Mattusch, J., Morgenstern, P., Pérez-Cruz, M.A., Reyes-Ortega, Y., Wennrich, R., Yee-Madeira, H. (2008):
In situ and ex situ study of the enhanced modification with iron of clinoptilolite-rich zeolitic tuff for arsenic sorption from aqueous solutions
J. Colloid Interface Sci. 322 (2), 527 - 536