<abstract xml:lang="en" xmlns="http://www.w3.org/1999/xhtml">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.</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.

Pyromorphite formation from montmorillonite adsorbed lead

Faculty of Geology, Geophysics and Environment Protection, AGH University of Science and Technology, al. Mickiewicza 30, 30-059 Krakow, Poland

Department of Geological Sciences, Miami University, Oxford, Ohio, USA

Mineralogia

{"article-title":"Pyromorphite formation from montmorillonite adsorbed lead"}

The reaction of Pb-adsorbed montmorillonite with aqueous solutions of PO4 and Cl ions results in the decrease in phosphate concentration associated with the...

Pyromorphite formation from montmorillonite adsorbed lead

Data publikacji: 04 lip 2012

Zakres stron: 75 - 91

DOI: https://doi.org/10.2478/v10002-011-0008-5

Słowa kluczowe
sorption, desorption, immobilization, crystallization, apatite, smectite

This content is open access.

Pyromorphite formation from montmorillonite adsorbed lead

Data publikacji: 04 lip 2012

Zakres stron: 75 - 91

DOI: https://doi.org/10.2478/v10002-011-0008-5

Słowa kluczowesorption, desorption, immobilization, crystallization, apatite, smectite

This content is open access.

Słowa kluczowe
sorption, desorption, immobilization, crystallization, apatite, smectite