| Photoluminescent Characteristics of Bioceramic
Hydroxyapatite Nanoparticles Prepared from Eggshell
Waste Using Novel Green Synthesis Approach |
Ishan Choudhary,a,* Sunita Mehta,b
Nainsi Sharma,a
Rashmi Mittal,a
Rajeev Sehrawat,a
Rajat
Dhawana
and Sowjanya Palic
Pages : 132-141
DOI: 10.1080/0371750X.2025.2484611 |
| Abstract |
| The present study demonstrates the absorption and emission properties of
hydroxyapatite (HAp) nanoparticles obtained using the green synthesis approach.
The eggshell waste and natural fertilizers are used as calcium and phosphorous
sources. The lemon extract has been used as a plant source for reduction. The
synthesized HAp powder crystallizes to a hexagonal structure. The mean particle
size of the as-synthesized and 700o
annealed HAp powders lies around 55 and 47 nm,
respectively. The elemental composition analysis revealed that the Ca/P ratio of 700oC
annealed HAp nanoparticles is 1.58 and lies close to the ideal value of 1.6. HAp
nanoparticles show a direct band gap transition with an optical band gap of 3.15 and
2.82 eV for the as-synthesized and 700oC annealed HAp nanoparticles, respectively.
The HAp nanoparticles’ emission properties showed a broad emission spectrum in
the visible range, mainly comprised of 3.0 emission peaks at 382.78, 437.82 and 507.35
nm. The Commission Internationale de I’Eclairage (CIE) colour coordinates
corresponding to these wavelengths are (0.17, 0.01), (0.15, 0.8) and (0.53,0.28),
respectively. The emission appears due to the formation of defects, such as oxygen
vacancies and symmetry breakdown of the structural arrangement of the phosphate
(PO4
3–) and hydroxide (OH–
) ions.
[Keywords: HAp, Eggshell waste, Green synthesis, Absorption, Emission] |
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