NDLI: Effects of temperature on the preparation and characteristics of hydroxyapatite and its adsorptive properties toward lead

Content Provider	Royal Society of Chemistry (RSC)
Author	Batis, Narjès Harrouch Khal, Hana El
Copyright Year	2015
Abstract	Hydroxyapatite (HAp), [Ca10(PO4)6(OH)2], was successfully synthesized by a combustion method in the aqueous system containing calcium nitrate, di-ammonium phosphate and urea. The effect of calcination temperature on the composition of the HAp phase was studied using XRD, FTIR, ATD/ATG, and N2 adsorption. It was found that at 500 °C and 700 °C, the dominant phase in the powders was HAp with small amounts of β-tricalcium phosphate (β-TCP), and only the HAp phase was observed at 300 °C. The synthesized HAp2 with a higher specific surface area (48 m2 g−1) was used for the removal of Pb2+. The following parameters contact time, initial concentration of lead and temperature were studied in batch experiments. Kinetic studies showed that the pseudo-second-order kinetic model was an appropriate model to describe the dynamic behavior of the adsorption process. The Langmuir isotherm model was certainly fitted to the equilibrium data. HAp2 can then be used as an effective adsorbent for removal of Pb2+ from aqueous solution.
Starting Page	3597
Ending Page	3607
Page Count	11
File Format	HTM / HTML PDF
ISSN	11440546
Volume Number	39
Issue Number	5
Journal	New Journal of Chemistry
DOI	10.1039/c4nj01836b
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	X-ray crystallography Urea Adsorption Langmuir Phosphate Hydroxylapatite Calcination Specific surface area Calcium nitrate Langmuir adsorption model
Content Type	Text
Resource Type	Article
Subject	Chemistry Materials Chemistry Catalysis

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