Preparation of lead hydroxyapatite particles using acetamide
Abstract
Lead hydroxyapatite (PbHAP) particles were prepared by a homogeneous precipitation reaction of Pb(NO
3
)
2
and (NH
4
)
2
HPO
4
using acetamide (AA) in aqueous media. The particles obtained under different conditions were examined by various methods, including XRD, FTIR, SEM, ICP, TG-DTA and N
2
adsorption. The crystal phase of the products depended on the concentration of AA ([AA]) and the ageing period (t
a
). Large highly crystalline needle-like PbHAP particles were formed by ageing at [AA]=0.4-1.6 mol dm
–3
and t
a
≥1 day. At [AA]≥3.2 mol dm
–3
a mixture of PbHAP and α-Pb
3
(PO
4
)
2
was generated. The transformation of α-Pb
3
(PO
4
)
2
to PbHAP in solution at [AA]≥3.2 mol dm
–3
was hindered by CH
3
COOH, produced by hydrolysis of AA.
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