Journal
APPLIED CLAY SCIENCE
Volume 176, Issue -, Pages 49-57Publisher
ELSEVIER
DOI: 10.1016/j.clay.2019.04.018
Keywords
Layered double hydroxides; Ca2Al-NO3 hydrocalumite; Orthophosphate; Adsorption; Hydroxyapatite; Brushite
Funding
- The Innovation Fund Denmark via the project RecoverP
- Villum Foundation via the Villum Young Investigator Programme [VKR022364]
- 600 MHz NMR (Villum Center for Bioanalytical Services)
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This study reports the mechanism of reactivity of phosphate anions (HPO42-) with Ca2Al-NO3 LDH. Sequestration of PO4 by Ca2Al-NO3 was quantified by fitting the adsorption isotherm with a Langmuir model. Adsorption capacity (65.2 mgP.g(-1) of LDH) is greater than the theoretical anion exchange capacity indicating further mechanism of sequestration. Partial dissolution of CaAl-NO3 results in precipitation of multiple Ca-PO4 phases. Combined characterizations by XRD, Al-27 and P-31 NMR, FTIR/Raman and SEM highlight the competitive precipitation of hydroxyapatite and brushite within the LDH structure. Multiple environment of PO4 anions offer promising perspective for CaAl-NO3/PO4 as slow release fertilizer.
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