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Dissolution of the chrysotile structure in nitric-acid solutions at different pH

Published online by Cambridge University Press:  02 January 2018

Teruhisa Hongo
Teruhisa Hongo*
Affiliation:
Work Environment Research Group, National Institute of Occupational Safety and Health, Japan, 6-21-1 Nagao, Tama-Ku, Kawasaki 214-8585, Japan
*
*E-mail: [email protected]
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Abstract

The nitric-acid dissolution of chrysotile was investigated with the aim of revealing the effect of pH on its structure. Chrysotile becomes more soluble at lower pH, with the octahedral, brucite sheet more readily dissolved than the tetrahedral sheet. The dissolution of the brucite sheet increases the pH of the solvent, because of the release of OH− groups along with the Mg2+ ions. At pH 2.00, the characteristic cylindrical fibre bundle structure of chrysotile is retained after dissolution, although the outside surface of each fibre becomes rough. Chrysotile remains fibrous upon dissolution at pH 1.08, but the fibres are no longer crystalline and their cylindrical structure collapses. The nitric-acid treatments result in an increase in both the specific surface area and the pore volume of chrysotile.

Keywords

Chrysotiledissolutionlayer silicatepH
Type
Research Article
Information
Clay Minerals , Volume 51 , Issue 5 , December 2016 , pp. 715 - 722
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2016

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