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Selectivity of Co and Ni by K-depleted micas

Published online by Cambridge University Press:  01 January 2024

Yunchul Cho ,
Sridhar Komarneni  and
Sang-il Choi
Yunchul Cho
Affiliation:
Peter A. Rock Thermochemistry Laboratory and NEAT ORU, University of California at Davis, Davis, CA 95616, USA
Sridhar Komarneni*
Affiliation:
Department of Crop and Soil Science and Materials Research Institute, The Pennsylvania State University, University Park, PA 16802, USA
Sang-il Choi
Affiliation:
Department of Environmental Engineering, Kwangwoon University, 447-1, Wolgye-Dong, Nowon-Gu, Seoul, South Korea
*
* E-mail address of corresponding author: [email protected]
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Abstract

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Contamination of the environment with heavy metals, including cationic radionuclides, is a serious problem which has yet to be fully overcome. A class of potentially effective cation exchangers for sequestering heavy metals which has received little attention is K-depleted mica. The purpose of this study was to investigate the heavy-metal cation exchange properties of K-depleted phlogopite and biotite, which were prepared from a natural phlogopite and biotite, respectively, using sodium tetraphenylborate (NaTPB). The X-ray diffraction (XRD) patterns showed that interlayer K+ ions were completely replaced with exchangeable Na+ ions, resulting in the expansion of the d001 spacing of both K-depleted phlogopite and K-depleted biotite. In order to investigate the cation exchange selectivity of K-depleted phlogopite and biotite for Co2+ and Ni2+, cation exchange isotherms and Kielland plots were constructed. The isotherms and Kielland plots indicated that both K-depleted phlogopite and biotite are highly selective for Co2+ as well as Ni2+. The XRD patterns after both 2Na+ → Co2+ and Ni2+ exchange reactions suggest that double sheets of interlayer water are present in the interlayer. These K-depleted micas are potential cation exchange materials for removal of some heavy metals such as Ni and radioactive species such as 60Co from solution.

Keywords

Heavy-metal CationIon ExchangeK-depleted BiotiteK-depleted Phlogopite
Type
Article
Information
Clays and Clay Minerals , Volume 57 , Issue 3 , June 2009 , pp. 279 - 289
Copyright
Copyright © The Clay Minerals Society 2009

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