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Nano-Hydroxyapatite Prepared from Eggshell-Derived Calcium-Precursor using Reverse Microemulsions as Nanoreactor 
Akter Jahan, S; Mollah, MYA; Ahmed, S; Abu Bin Hasan Susan, M 
Materials Today: Proceedings
ISSN: 2214-7853 
Elsevier Ltd 
Nano-hydroxyapatite (nano-HAP) has been, for the first time, successfully synthesized at ambient temperature from eggshell-derived Ca-precursor using reverse microemulsions. Water-in-oil microemulsions, prepared with cyclohexane, water, 1-pentanol and a non-ionic surfactant, Triton X-100 served as template to prepare nano-HAP from Ca-acetate derived from the bio-waste. Nano-HAP, thermally treated at 100, 300, and 600 °C were used to investigate the phase properties by x-ray diffraction patterns and formation of HAP phase could be confirmed. Particle size analyzed by dynamic light scattering measurements show that the microemulsions were nanodroplets and served as nanoreactor to yield HAP of nanodimension. The nano-HAP comprises apatitic phosphate and hydroxyl groups and appears in an elongated spherical shape. Calcination of nano-HAP at 600°C resulted in the formation of β-tricalcium phosphate as the secondary phase. Finally, the potential of nano-HAP as an efficient adsorbent for removal of arsenic(V) and other heavy metals from aqueous solution has been explored. 2017 Elsevier Ltd. All rights reserved. 
Adsorbent; Dynamic light scattering; Hydroxyapatite; Microemulsion 
Singh, N. B.