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Structure–Activity Relationship of Lanthanide-Incorporated Nano-Hydroxyapatite for the Adsorption of Fluoride and Lead
Wimalasiri, A. K. D. V. K.; Fernando, M. Shanika; Dziemidowicz, Karolina; Williams, Gareth R.; Koswattage, K. R.; Dissanayake, D. P.; De Silva, K. M. N.; De Silva, R. M.
Citation:Wimalasiri, A. V. K., Fernando, M. S., Dziemidowicz, K., Williams, G. R., Koswattage, K. R., Dissanayake, D. P., ... & de Silva, R. M. (2021). Structure–Activity Relationship of Lanthanide-Incorporated Nano-Hydroxyapatite for the Adsorption of Fluoride and Lead. ACS omega, 6(21), 13527-13543.
Date:2021-05-17
Abstract:
The growing demand for water purification provided the initial momentum to produce lanthanide-incorporated
nano-hydroxyapatite (HAP) such as HAP·CeO2, HAP·CeO2·La(OH)3 (2:1), and HAP·CeO2·La(OH)3 (3:2). These materials open
avenues to remove fluoride and lead ions from contaminated water bodies effectively. Composites of HAP containing CeO2 and
La(OH)3 were prepared using in situ wet precipitation of HAP, followed by the addition of Ce(SO4)2 and La(NO3)3 into the same
reaction mixture. The resultant solids were tested for the removal of fluoride and lead ions from contaminated water. It was found
that the composite HAP·CeO2 shows fluoride and lead ion removal capacities of 185 and 416 mg/g, respectively. The fluoride
removal capacity of the composite was improved when La(OH)3 was incorporated and it was observed that the composite HAP·
CeO2·La(OH)3 (3:2) has the highest recorded fluoride removal capacity of 625 mg/g. The materials were characterized using
scanning electron microscopy−energy-dispersive X-ray (SEM-EDX) spectrometry, Fourier transform infrared (FT-IR) spectrometry,
X-ray powder diffractometry (XRD), X-ray photoelectron spectroscopy (XPS), and Brunauer−Emmett−Teller (BET) surface area
analysis. Analysis of results showed that Ce and La are incorporated in the HAP matrix. Results of kinetic and leaching analyses
indicated a chemisorptive behavior during fluoride and lead ion adsorption by the composites; meanwhile, the thermodynamic
profile shows a high degree of feasibility for fluoride and lead adsorption.