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Synthesis and performance of a photocatalytic titania-hydroxyapatite composite

Published online by Cambridge University Press:  31 January 2011

N. Phonthammachai ,
J. Kim  and
T.J. White
N. Phonthammachai*
Affiliation:
School of Materials Science and Engineering, Nanyang Technological University, Singapore 639798
J. Kim
Affiliation:
School of Materials Science and Engineering, Nanyang Technological University, Singapore 639798
T.J. White
Affiliation:
School of Materials Science and Engineering, Nanyang Technological University, Singapore 639798
*
a)Address all correspondence to this author. e-mail: nopphawan@ntu.edu.sg
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Abstract

The photocatalytic degradation of methylene blue (MB) over a porous titania-hydroxyapatite (HAp) composite under ultraviolet radiation was studied. The catalyst was prepared by coating porous HAp with a titanium butoxide [Ti(OBu)4] sol at titania loadings of 17–49 wt%. Quantitative powder x-ray diffraction showed higher proportions of anatase as the calcination temperature increased from 500 to 800 °C due to crystallization of an amorphous precursor. The transformation of anatase to rutile was delayed until 900 °C, demonstrating the high thermal stability of the composite. Decomposition of HAp to α- and β- tricalcium phosphates takes place at 900 °C and is accompanied by the formation of perovskite at 1000 °C. A systematic study of the influence of calcination temperature and titania:HAp ratios demonstrated that for the optimal material, a surface area of 100 m2 g−1 was obtained at a titania loading of 49 wt% and calcination temperature of 600 °C. A highly dispersed suspension of finely ground titania-HAp enhanced the photodegradation of MB, allowed a high percentage recovery of catalyst, and was shown to be recyclable.

Keywords

CatalyticCompositeSol-gel
Type
Articles
Information
Journal of Materials Research , Volume 23 , Issue 9 , September 2008 , pp. 2398 - 2405
Copyright
Copyright © Materials Research Society 2008

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References

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