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Pyromorphite formation from montmorillonite adsorbed lead Cover

Pyromorphite formation from montmorillonite adsorbed lead

Open Access
|Jul 2012

Abstract

The reaction of Pb-adsorbed montmorillonite with aqueous solutions of PO4 and Cl ions results in the decrease in phosphate concentration associated with the formation of a new phase - pyromorphite Pb5(PO4)3Cl. Pyromorphite crystals range in size from hundreds of nm to several tens of μm, depending on the PO4, K, and Ca concentrations in the reacting system. A strong ion-exchange effect of K+ and Ca2+ cations on desorption of Pb2+ from Pb-adsorbed montmorillonite was observed. Also, a high concentration of cations leads to a rapid desorption of Pb and the formation of fine pyromorphite crystals. In contrast, low PO4, K and Ca concentrations result in the formation of relatively large euhedral crystals. Final Pb concentrations are much lower in experimental sets than in control experiments with no phosphate present.

DOI: https://doi.org/10.2478/v10002-011-0008-5 | Journal eISSN: 1899-8526 | Journal ISSN: 1899-8291
Language: English
Page range: 75 - 91
Published on: Jul 4, 2012
Published by: Mineralogical Society of Poland
In partnership with: Paradigm Publishing Services
Publication frequency: 1 issue per year

© 2012 Tomasz Bajda, Tomasz Marchlewski, Maciej Manecki, published by Mineralogical Society of Poland
This work is licensed under the Creative Commons License.