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The preparation of hydroxyapatite from unrefined calcite residues and its application for lead removal from aqueous solutions
Calcite originating from waste treatment technologies was utilised for the chemical precipitation of hydroxyapatite (HAP). The physicochemical properties of the as-synthesised-HAP was fully characterised using FT-IR, BET, SEM and TEM, confirming its crystal structure and formation of high purity HAP...
Autores principales: | , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
The Royal Society of Chemistry
2019
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9060579/ https://www.ncbi.nlm.nih.gov/pubmed/35518096 http://dx.doi.org/10.1039/c8ra04701d |
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author | Bernalte, Elena Kamieniak, Joanna Randviir, Edward P. Bernalte-García, Álvaro Banks, Craig E. |
author_facet | Bernalte, Elena Kamieniak, Joanna Randviir, Edward P. Bernalte-García, Álvaro Banks, Craig E. |
author_sort | Bernalte, Elena |
collection | PubMed |
description | Calcite originating from waste treatment technologies was utilised for the chemical precipitation of hydroxyapatite (HAP). The physicochemical properties of the as-synthesised-HAP was fully characterised using FT-IR, BET, SEM and TEM, confirming its crystal structure and formation of high purity HAP by XRD. The product was employed for removal of lead from aqueous media at pH 5.0, achieving almost 80% of the adsorption in the first 5 min and a maximum adsorption capacity for Pb(2+) of 224.4 mg g(−1). A contact time of 40 min was required to achieve equilibrium with Pb(2+) uptake of 98%. The kinetics of the cation exchange of HAP from calcite were predicted using integrated rate laws, revealing a pseudo-second order cation exchange process with a rate constant of 6.84 × 10(−4) g (mg min)(−1). All obtained results are benchmarked against a control HAP sample simultaneously derived from eggshells, which were demonstrated to offer slower kinetics of cation exchange (4.82 × 10(−4) g (mg min)(−1)) and almost half the maximum adsorption capacity (129.1 mg g(−1)). The results showed that hydroxyapatite synthesised from calcite waste represents a low-cost material for the adsorption of hazardous Pb(2+) in contaminated waters and a promising alternative for heavy metals remediation in aquatic environments. |
format | Online Article Text |
id | pubmed-9060579 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2019 |
publisher | The Royal Society of Chemistry |
record_format | MEDLINE/PubMed |
spelling | pubmed-90605792022-05-04 The preparation of hydroxyapatite from unrefined calcite residues and its application for lead removal from aqueous solutions Bernalte, Elena Kamieniak, Joanna Randviir, Edward P. Bernalte-García, Álvaro Banks, Craig E. RSC Adv Chemistry Calcite originating from waste treatment technologies was utilised for the chemical precipitation of hydroxyapatite (HAP). The physicochemical properties of the as-synthesised-HAP was fully characterised using FT-IR, BET, SEM and TEM, confirming its crystal structure and formation of high purity HAP by XRD. The product was employed for removal of lead from aqueous media at pH 5.0, achieving almost 80% of the adsorption in the first 5 min and a maximum adsorption capacity for Pb(2+) of 224.4 mg g(−1). A contact time of 40 min was required to achieve equilibrium with Pb(2+) uptake of 98%. The kinetics of the cation exchange of HAP from calcite were predicted using integrated rate laws, revealing a pseudo-second order cation exchange process with a rate constant of 6.84 × 10(−4) g (mg min)(−1). All obtained results are benchmarked against a control HAP sample simultaneously derived from eggshells, which were demonstrated to offer slower kinetics of cation exchange (4.82 × 10(−4) g (mg min)(−1)) and almost half the maximum adsorption capacity (129.1 mg g(−1)). The results showed that hydroxyapatite synthesised from calcite waste represents a low-cost material for the adsorption of hazardous Pb(2+) in contaminated waters and a promising alternative for heavy metals remediation in aquatic environments. The Royal Society of Chemistry 2019-01-30 /pmc/articles/PMC9060579/ /pubmed/35518096 http://dx.doi.org/10.1039/c8ra04701d Text en This journal is © The Royal Society of Chemistry https://creativecommons.org/licenses/by-nc/3.0/ |
spellingShingle | Chemistry Bernalte, Elena Kamieniak, Joanna Randviir, Edward P. Bernalte-García, Álvaro Banks, Craig E. The preparation of hydroxyapatite from unrefined calcite residues and its application for lead removal from aqueous solutions |
title | The preparation of hydroxyapatite from unrefined calcite residues and its application for lead removal from aqueous solutions |
title_full | The preparation of hydroxyapatite from unrefined calcite residues and its application for lead removal from aqueous solutions |
title_fullStr | The preparation of hydroxyapatite from unrefined calcite residues and its application for lead removal from aqueous solutions |
title_full_unstemmed | The preparation of hydroxyapatite from unrefined calcite residues and its application for lead removal from aqueous solutions |
title_short | The preparation of hydroxyapatite from unrefined calcite residues and its application for lead removal from aqueous solutions |
title_sort | preparation of hydroxyapatite from unrefined calcite residues and its application for lead removal from aqueous solutions |
topic | Chemistry |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9060579/ https://www.ncbi.nlm.nih.gov/pubmed/35518096 http://dx.doi.org/10.1039/c8ra04701d |
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