Characterization of Fe(III) Adsorption onto Zeolite and Bentonite

Tomáš Bakalár, Mária Kaňuchová, Anna Girová, Henrieta Pavolová, Rudolf Hromada and Zuzana Hajduová
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Tomáš Bakalár: Faculty of Mining, Ecology, Process Control and Geotechnologies, Technical University of Košice, 04200 Košice, Slovakia
Mária Kaňuchová: Faculty of Mining, Ecology, Process Control and Geotechnologies, Technical University of Košice, 04200 Košice, Slovakia
Anna Girová: Faculty of Mining, Ecology, Process Control and Geotechnologies, Technical University of Košice, 04200 Košice, Slovakia
Henrieta Pavolová: Faculty of Mining, Ecology, Process Control and Geotechnologies, Technical University of Košice, 04200 Košice, Slovakia
Rudolf Hromada: Institute of Hygiene of Animals and Environment, University of Veterinary Medicine and Pharmacy in Košice, 041 81 Košice, Slovakia
Zuzana Hajduová: Faculty of Business Management, University of Economics in Bratislava, 852 35 Bratislava, Slovakia

IJERPH, 2020, vol. 17, issue 16, 1-13

Abstract: In this study, the adsorption of Fe(III) from aqueous solution on zeolite and bentonite was investigated by combining batch adsorption technique, Atomic adsorption spectroscopy, X-ray diffraction, and X-ray photoelectron spectroscopy analyses. Although iron is commonly found in water and is an essential bioelement, many industrial processes require efficient removal of iron from water. Two types of zeolite and two types of bentonite were used. The results showed that the maximum adsorption capacities for removal of Fe (III) by Zeolite Micro 20, Zeolite Micro 50, blue bentonite, and brown bentonite were 10.19, 9.73, 11.64, and 16.65 mg.g −1 , respectively. Based on the X-ray photoelectron spectroscopy (XPS) and X-ray fluorescence (XRF) analyses of the raw samples and the solid residues after sorption at low and high initial Fe concentrations, the Fe content is different in the surface layer and in the bulk of the material. In the case of lower initial Fe concentration (200 mg.dm −3 ), more than 95% of Fe is adsorbed in the surface layer. In the case of higher initial Fe concentration (4000 mg.dm −3 ), only about 45% and 61% of Fe is adsorbent in the surface layer of zeolite and bentonite, respectively; the rest is adsorbed in deeper layers.

Keywords: zeolite; bentonite; adsorption; Fe (III) removal; surface layer (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2020
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