Study of calcium/lead apatite structure type for stabilising heavy metals

(CaxPb10-x)(VO4)6F2 apatites were synthesised and their microstructures were studied using powder X-ray diffraction, scanning electron microscopy and transmission electron microscopy before and after leach testing. X-ray diffraction showed that the apatites were hexagonal with a ≈ 10Å and c ≈ 7Å. Du...

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Main Authors: Dong, Zhili, White, Timothy John, Wei, B.
Other Authors: School of Materials Science & Engineering
Format: Conference or Workshop Item
Language:English
Published: 2011
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Online Access:https://hdl.handle.net/10356/79928
http://hdl.handle.net/10220/6898
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-799282023-07-08T05:40:57Z Study of calcium/lead apatite structure type for stabilising heavy metals Dong, Zhili White, Timothy John Wei, B. School of Materials Science & Engineering Materials Research Society Symposium (2001) DRNTU::Engineering::Materials::Ecomaterials (CaxPb10-x)(VO4)6F2 apatites were synthesised and their microstructures were studied using powder X-ray diffraction, scanning electron microscopy and transmission electron microscopy before and after leach testing. X-ray diffraction showed that the apatites were hexagonal with a ≈ 10Å and c ≈ 7Å. During the leach test, Pb was released into the solution more slowly than Ca, which is desirable as the immobilisation of Pb is of importance. The experimental results also showed that V was almost undetectable in the leaching test solutions. In the (Ca7Pb3)(VO4)6F2 pellet, Ca and Pb distributions were not homogenous from one grain to another. Microstructural evidence from scanning electron microscopy revealed that the dissolution via development of etch pits began at grain boundaries and inside grains, and progressed faster in Ca rich regions. These results suggest that apatites of high Pb to Ca ratio are more durable. Published version 2011-07-14T00:51:11Z 2019-12-06T13:37:01Z 2011-07-14T00:51:11Z 2019-12-06T13:37:01Z 2001 2001 Conference Paper Dong, Z. L., Wei, B., & White, T. J. (2001). Study of Calcium/Lead Apatite Structure Type for Stabilising Heavy Metals. Materials Research Society Symposium Proceedings, 658.. https://hdl.handle.net/10356/79928 http://hdl.handle.net/10220/6898 10.1557/PROC-658-GG6.33 en © 2000 Materials Research Society. This paper was published in Materials Research Society Symposium Proceedings and is made available as an electronic reprint (preprint) with permission of Materials Research Society. The paper can be found at the following DOI: http://dx.doi.org/ 10.1557/PROC-658-GG6.33. One print or electronic copy may be made for personal use only. Systematic or multiple reproduction, distribution to multiple locations via electronic or other means, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper is prohibited and is subject to penalties under law. 6 p. application/pdf
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic DRNTU::Engineering::Materials::Ecomaterials
spellingShingle DRNTU::Engineering::Materials::Ecomaterials
Dong, Zhili
White, Timothy John
Wei, B.
Study of calcium/lead apatite structure type for stabilising heavy metals
description (CaxPb10-x)(VO4)6F2 apatites were synthesised and their microstructures were studied using powder X-ray diffraction, scanning electron microscopy and transmission electron microscopy before and after leach testing. X-ray diffraction showed that the apatites were hexagonal with a ≈ 10Å and c ≈ 7Å. During the leach test, Pb was released into the solution more slowly than Ca, which is desirable as the immobilisation of Pb is of importance. The experimental results also showed that V was almost undetectable in the leaching test solutions. In the (Ca7Pb3)(VO4)6F2 pellet, Ca and Pb distributions were not homogenous from one grain to another. Microstructural evidence from scanning electron microscopy revealed that the dissolution via development of etch pits began at grain boundaries and inside grains, and progressed faster in Ca rich regions. These results suggest that apatites of high Pb to Ca ratio are more durable.
author2 School of Materials Science & Engineering
author_facet School of Materials Science & Engineering
Dong, Zhili
White, Timothy John
Wei, B.
format Conference or Workshop Item
author Dong, Zhili
White, Timothy John
Wei, B.
author_sort Dong, Zhili
title Study of calcium/lead apatite structure type for stabilising heavy metals
title_short Study of calcium/lead apatite structure type for stabilising heavy metals
title_full Study of calcium/lead apatite structure type for stabilising heavy metals
title_fullStr Study of calcium/lead apatite structure type for stabilising heavy metals
title_full_unstemmed Study of calcium/lead apatite structure type for stabilising heavy metals
title_sort study of calcium/lead apatite structure type for stabilising heavy metals
publishDate 2011
url https://hdl.handle.net/10356/79928
http://hdl.handle.net/10220/6898
_version_ 1772826776607653888