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Effects of γ-irradiation on the Cu2+ sorption behaviour of NaOH-modified Philippine natural zeolites

Published online by Cambridge University Press:  20 October 2020

Mon Bryan Z. Gili  and
Eleanor M. Olegario Open the ORCID record for Eleanor M. Olegario [Opens in a new window]
Mon Bryan Z. Gili
Affiliation:
Philippine Nuclear Research Institute – Department of Science and Technology, Commonwealth Avenue, Diliman, Quezon City1101, Philippines
Eleanor M. Olegario*
Affiliation:
Department of Mining, Metallurgical and Materials Engineering, College of Engineering, University of the Philippines Diliman, Quezon City1101, Philippines
*
Author for correspondence: Eleanor M. Olegario, Email: eleanor.olegario_sanchez@upd.edu.ph
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Abstract

Adsorption kinetic and thermodynamic tests were conducted using non-irradiated and γ-irradiated (400 kGy) NaOH-modified Philippine natural zeolites for the removal of Cu2+ ions in aqueous solution. The effects of γ-radiation on zeolites were investigated. Samples were equilibrated with binary systems of Cu2+ ↔ 2Na+ at room temperature. There were no significant changes in the elemental composition of the irradiated zeolite. Irradiation primarily results in the shrinking of the zeolite framework and improvements in the crystallinity. The γ-irradiation increases the sorption uptake according to the kinetic study in which the adsorption kinetics followed a pseudo-second-order model. Thermodynamic tests show that the adsorption isotherms of the two samples are best described by the Langmuir model. The maximum adsorption capacities of the non-irradiated and γ-irradiated NaOH-modified zeolites are 33.00 and 43.22 mg Cu2+ g–1, respectively, suggesting that γ-irradiation might enhance the maximum adsorption capacity by up to 30.8%.

Keywords

γ-radiationadsorptionheavy metalsnatural zeolites
Type
Article
Information
Clay Minerals , Volume 55 , Issue 3 , September 2020 , pp. 248 - 255
Copyright
Copyright © The Author(s), 2020. Published by Cambridge University Press on behalf of The Mineralogical Society of Great Britain and Ireland

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Footnotes

Principal Editor: George E. Christidis

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