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Hydrothermal synthesis of hydroxyapatite nanocrystals from calcium-rich limestone sludge waste: Preparation, characterization, and application for Pb2+ adsorption in aqueous solution.
- Source :
-
Inorganic Chemistry Communications . Feb2024, Vol. 160, pN.PAG-N.PAG. 1p. - Publication Year :
- 2024
-
Abstract
- [Display omitted] • Converting limestone sludge waste into hydroxyapatite rod-shaped particles by hydrothermal method. • The obtained materials were found to be effective adsorbents for Pb2+. • Preparing a novel sorbent with high adsorption capacity of 476.19 mg/g. • This provides a new avenue to address wastewater treatment and limestone sludge. This paper reports on the recycling of the Ca2+ ion-rich filtrate of limestone sludge for use as a raw material in the hydrothermal synthesis of hydroxyapatite (HAp) applicable to the removal of Pb2+ ions from aqueous solutions. Samples of HAp (eco-HAp) were prepared using a range of Ca/P molar ratios (Ca/P MRs) (1, 1.67, 2.33 and 3) and hydrothermal temperatures (393–453 K). Fourier transform infrared spectroscopy revealed the presence of O–H groups and PO 4 3–(ν1) groups (indicative of HAp). Transmission electron microscopy revealed the presence of elliptical surface microstructures. Solid-state nuclear magnetic resonance (NMR) spectroscopy revealed single crystal sites of inorganic phosphorus (31P) and hydroxyls (1H). The adsorption capacity of eco-HAp samples reached 476.19 mg/g within 20 min. The results of adsorption kinetics were characteristic of pseudo-second-order kinetics. Langmuir adsorption isotherms revealed that the Pb2+ adsorption capacity of ecoHAp was 277.77 mg/g, which can be attributed to a synergistic mechanism involving ion exchange, chemical precipitation, surface complexation, and dissolution/precipitation. Taken together, these results demonstrate the potential of eco-HAp as an adsorbent material with broad industrial applicability for the removal of heavy metals from aqueous solutions. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 13877003
- Volume :
- 160
- Database :
- Academic Search Index
- Journal :
- Inorganic Chemistry Communications
- Publication Type :
- Academic Journal
- Accession number :
- 174872690
- Full Text :
- https://doi.org/10.1016/j.inoche.2023.111943