Preparation and Characterization of HAp/TiO₂ Nanocomposite for Photocatalytic Degradation of Methyl Orange under UV-Irradiation

Abstract:

A new in-situ precipitation technique is introduced in this study to prepare hydroxyapatite/titania nanocomposites. This technique provides a better control over the microstructures and phase compositions of nanocomposites. The structure and surface morphology of hydroxyapatite/titania nanocomposite were characterized by X-ray diffraction analysis, Fourier transform infrared spectroscopy and scanning electron microscopes. The photocatalytic activity of hydroxyapatite/titania nanocomposite was evaluated by photocatalytic decolorization of methyl orange in aqueous solution as a model pollutant under UV-irradiation. X-ray diffraction and Fourier transform infrared results indicated that hydroxyapatite and anatase (TiO₂) were the major crystalline phases. There had been no reaction between hydroxyapatite and titania compounds. Based on the SEM images, the overall morphology of the samples indicates that there exists a distribution of small particles and large agglomerates.The hydroxyapatite/titania nanocomposite exhibited high photocatalytic activity hydroxyapatite/titania nanocomposite under UV-irradiation. After 8 h of irradiation by UV-irradiation, over 80% of methyl orange solution (5 mg L^-1) was decolorized with 1 gL^-1 of the photocatalyst. Since this process does not require the addition of hydrogen peroxide and uses UV-irradiation in this study are environmentally friendly method to decolorize azo dye.

• Periodical: Advanced Materials Research (Volume 829)
• Pages: 594-599
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.829.594
• Online since: November 2013
• Authors: Saham Sharifat*, Hossein Zolgharnein, Abdolghader Hamidifalahi, Mahnaz Enayati-Jazi, Entesar Hamid
• Keywords: Degradation, HAp/TiO₂, Methyl Orange Photocatalytic, Nanocomposite

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