Structure investigation of As(III)- and As(V)-species bound to Fe-modified clinoptilolite tuffs (CROSBI ID 148406)
Prilog u časopisu | izvorni znanstveni rad | međunarodna recenzija
Podaci o odgovornosti
Šiljeg, Mario ; Cerjan Stefanović, Štefica ; Mazaj, Matjaž ; Novak Tušar, Nataša ; Arčon, Iztok ; Kovač, Janez ; Margeta, Karmen ; Kaučič, Venčeslav ; Zabukovec Logar, Nataša
engleski
Structure investigation of As(III)- and As(V)-species bound to Fe-modified clinoptilolite tuffs
The structure of (AsO2)-- and (HAsO4)2-- modified clinoptilolite samples from the two deposits (Vranjska Banja, Serbia and Donje Jesenje, Croatia) was studied using Powder X- Ray Diffraction (XRPD), Scanning Electron Microscopy (SEM), Energy Dispersive X-ray Analysis (EDXS) and X-ray Photoelectron Spectroscopy (XPS). Local environment of As ions was investigated by X-ray Absorption Spectroscopy (XAS). The pre-treatment of clinoptilolite tuff by using first NaCl and later FeCl3 solutions resulted in an arsenic uptake of up to 1.2 wt.%, whereas no As-uptake could be detected in the untreated zeolite. The X-ray Photoelectron Spectroscopy depth profile analyses of (AsO2)-- and (HAsO4)2--modified samples show that As concentrations decrease from the surfaces towards the subsurface region of crystallites suggesting that the As atoms are mainly located at surfaces of crystallites. EXAFS (Extended X-ray Absorption Fine Structure) and XANES (X-ray Absorption Near Edge Structure) analysis revealed that arsenic cations in the samples arrange in the form of oxo-complexes attached to the iron cations on the surface of the clinoptilolite. The post- treatment of the samples with three different solutions of HCl confirmed irreversible sorption of arsenic in the zeolite by the chemisorption mechanism.
clinoptilolite ; zeolite ; arsenic-removal ; arsenate ; arsenite ; As K XANES
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Podaci o izdanju
118 (1-3)
2009.
408-415
objavljeno
1387-1811
1873-3093
10.1016/j.micromeso.2008.09.009
Povezanost rada
Interdisciplinarne tehničke znanosti, Kemija, Temeljne tehničke znanosti