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Journal Articles Ceramics International Year : 2023

Sodium bicarbonate-hydroxyapatite used for removal of lead ions from aqueous solution

Silviu Adrian Predoi
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Steluta Carmen Ciobanu
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Carmen Mariana Chifiriuc
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Simona Liliana Iconaru
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Daniela Predoi
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Catalin Constantin Negrila
Ioana Cristina Marinas
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Steinar Raaen
Krzysztof Rokosz
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This study reports the development of a novel biocomposite for potential applications in the environmental remediation. The hydroxyapatite/sodium bicarbonate (HAp-SB) biocomposite obtained by a cheap method could offer promising characteristics to be used in environmental applications. The obtaining of HAp-SB ceramic composites was studied with the aim of increasing the adsorption efficiency of lead ions from contaminated waters. A composite material (HAp-SB) with good crystallinity that preserves the hexagonal structure of pure hydroxyapatite was obtained. For the powder recovered after decontamination of the lead solution (PbHAp-SB), the XRD model highlighted additional maxima belonging to Ca 10 (PO 4) 5 (OH) 2 , Ca0.805Pb 4. 195 (PO 4)(OH) and PbH 2 P 2 O 7. The FTIR spectra of PbHAp-SB are similar to those of HAp-SB composites showing a broadening of the vibration peaks and a slight shift. The XPS and EDS studies illustrated the purity of the HAp-SB sample. Moreover, the presence of lead in the powder recovered after decontamination was also highlighted by XPS and EDS studies. The efficiency of HAp-SB in the adsorption of Pb 2+ ions from the contaminated solution was also highlighted by ultrasound studies using double-distilled water as the reference liquid. The adsorption kinetics were investigated with the aid of Langmuir and Freundlich theoretical models. The results demonstrated that the HAp-SB ceramic composite has a strong affinity for the adsorption of Pb 2+ ions from contaminated solutions. The removal efficiency of Pb 2+ ions was about 92% for the initial Pb 2+ concentration above 50 mg/L. The results of the cell viability and cytotoxicity studies demonstrated that HAp-SB nanoparticles did not influence negatively the HeLa cell's viability and did not induce any significant changes of the morphological features of HeLa cells after 24 h of incubation. The batch adsorption results as well as the cytotoxicity assay results suggested that the HAp-SB powder could be successfully used for the removal of Pb 2+ from contaminated water.
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insu-04266188 , version 1 (31-10-2023)



Silviu Adrian Predoi, Steluta Carmen Ciobanu, Carmen Mariana Chifiriuc, Simona Liliana Iconaru, Daniela Predoi, et al.. Sodium bicarbonate-hydroxyapatite used for removal of lead ions from aqueous solution. Ceramics International, 2023, ⟨10.1016/j.ceramint.2023.10.273⟩. ⟨insu-04266188⟩
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