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Synthesis and performance of a photocatalytic titania-hydroxyapatite composite

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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.

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Acknowledgments

This research work was supported under Grant No. 033 141 01 from the Agency for Science and Research, Singapore (A*STAR) through the German-Singapore (DFG) Joint Research Programme “Optimization of Quantum Effects in Apatite-based Nanocomposite Metallic and Semiconductor Catalysts for Environmental Protection”.

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  1. School of Materials Science and Engineering, Nanyang Technological University, Singapore, 639798

    N. Phonthammachai, J. Kim & T.J. White

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  1. N. Phonthammachai
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  2. J. Kim
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Correspondence to N. Phonthammachai.

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Phonthammachai, N., Kim, J. & White, T. Synthesis and performance of a photocatalytic titania-hydroxyapatite composite. Journal of Materials Research 23, 2398–2405 (2008). https://doi.org/10.1557/jmr.2008.0290

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