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• W2005804754 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, nFe/nAl=0.19, nSi/nFe=30.9 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 nFe/nSi=0.1 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." @default.
• W2005804754 created "2016-06-24" @default.
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• W2005804754 date "2008-06-01" @default.
• W2005804754 modified "2023-10-18" @default.
• W2005804754 title "In situ and ex situ study of the enhanced modification with iron of clinoptilolite-rich zeolitic tuff for arsenic sorption from aqueous solutions" @default.
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• W2005804754 doi "https://doi.org/10.1016/j.jcis.2008.03.042" @default.
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