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Preparation and Rietveld refinement of Ag-exchanged clinoptilolite

Published online by Cambridge University Press:  09 July 2018

L. Dimova ,
O. Petrov ,
M. Kadiyski ,
N. Lihareva ,
A. Stoyanova-Ivanova  and
V. Mikli
L. Dimova*
Affiliation:
Institute of Mineralogy and Crystallography, Bulgarian Academy of Sciences, Acad. G. Bonchev Street, Block 107, 1113 Sofia, Bulgaria
O. Petrov
Affiliation:
Institute of Mineralogy and Crystallography, Bulgarian Academy of Sciences, Acad. G. Bonchev Street, Block 107, 1113 Sofia, Bulgaria
M. Kadiyski
Affiliation:
Institute of Mineralogy and Crystallography, Bulgarian Academy of Sciences, Acad. G. Bonchev Street, Block 107, 1113 Sofia, Bulgaria Crystallographic Mineralogy, University of Bern, Freiestr. 3, 3012 Bern, Switzerland
N. Lihareva
Affiliation:
Institute of Mineralogy and Crystallography, Bulgarian Academy of Sciences, Acad. G. Bonchev Street, Block 107, 1113 Sofia, Bulgaria
A. Stoyanova-Ivanova
Affiliation:
Georgi Nadjakov Institute of Solid State Physics, Bulgarian Academy of Sciences, 72 Tzarigradsko Chaussee Blvd., 1784 Sofia, Bulgaria
V. Mikli
Affiliation:
Centre for Materials Research, Tallinn University of Technology, Ehitajate 5, Tallinn 19086, Estonia
*
*E-mail: [email protected]
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Abstract

Fully exchanged Ag-clinoptilolite prepared at 100°C using 1 M solution of AgNO3 was studied. The initial sample (Beli Plast deposit, Bulgaria) was enriched in clinoptilolite by a sequence of treatments – crushing, sieving, sedimentation, and separation with heavy liquids to obtain a content of about 93 wt.% of clinoptilolite intergrown with opal-C. Opal-C was subsequently removed by chemical treatment. Maximum cation exchange was reached on the seventh day (4.86(4) Ag atoms per formula unit). Rietveld structural refinement was then carried out on the Ag-exchanged clinoptilolite, and three independent Ag sites were localated in the channels of the clinoptilolite structure. Seven water sites, coordinating the Ag sites, were located. Ag-clinoptilolite is, potentially, a promising low-cost antibacterial material.

Keywords

clinoptiloliteion exchangesilverRietveld refinementBeli Plast depositBulgaria
Type
Research Article
Information
Clay Minerals , Volume 46 , Issue 2 , June 2011 , pp. 205 - 212
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2011

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