Lead and zinc removal from aqueous solutions by aminotriphosphonate-modified converted natural phosphates
Apatite particles prepared from natural phosphate rock and grafted with nitrilotris(methylene)triphosphonate (NTP) were evaluated for Pb2+ and Zn2+ sorption from aqueous solutions. Sorption capacities as high as 640 mg.g-1 and 300 mg.g-1 could be obtained for the highest organic content (10 wt%). An...
| Veröffentlicht in: | Chemical engineering journal (Lausanne, Switzerland : 1996). - 1999. - 211-212(2012) vom: 15. Nov., Seite 233-239 |
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| Weitere Verfasser: | , , , , |
| Format: | Online-Aufsatz |
| Sprache: | English |
| Veröffentlicht: |
2012
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| Zugriff auf das übergeordnete Werk: | Chemical engineering journal (Lausanne, Switzerland : 1996) |
| Schlagworte: | Journal Article Apatite Natural Phosphate Porous material Surface functionalization heavy metals |
| Zusammenfassung: | Apatite particles prepared from natural phosphate rock and grafted with nitrilotris(methylene)triphosphonate (NTP) were evaluated for Pb2+ and Zn2+ sorption from aqueous solutions. Sorption capacities as high as 640 mg.g-1 and 300 mg.g-1 could be obtained for the highest organic content (10 wt%). Analysis of the sorption isotherms using Langmuir, Freundlich and Dubinin-Kaganer-Radushkevich models revealed that Pb2+ ions have a larger affinity for apatite (sorption energy ≈ 8 kJ.mol-1) than for NTP so that organo-modified surfaces led to a heterogenous adsorption process. In contrast, Zn2+ interacts weakly (sorption energy ≈ 1 kJ.mol-1) and similarly with the mineral surface and the organic moieties following a homogenous sorption process. Such an association of organic metal ligands with reactive apatite surfaces within porous materials appears as a promising strategy to obtain efficient adsorbents at low cost and limited environmental impact |
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| Beschreibung: | Date Revised 03.01.2023 published: Print-Electronic Citation Status PubMed-not-MEDLINE |
| ISSN: | 1385-8947 |
| DOI: | 10.1016/j.cej.2012.09.017 |