Titanium-doped hydroxyapatite (Ti-HAp, (Ca10-2x, Tix, hx) (PO4)6(OH)2, h: defect in Ca site) and hydrox- yapatite (HAp, Ca10(PO4)6(OH)2) powders were modified with an ethanol solution of molybdenyl acety- lacetonate (MoO2(C5H8O2)2) using chemisorption calcination cycle (CCC) technique, which provides metal oxide clusters. Their photocatalytic activity under UV illumination was evaluated by the decompo- sition of gaseous 2-propanol. The photocatalytic activity of the Mo-modified Ti-HAp samples increased concomitantly with increasing Mo concentration up to 0.72% against P. The highest photocatalytic activ- ity of Mo-modified Ti-HAp was about 13 times higher than that of Ti-HAp. The signal appearance of Mo (V) in electron spin resonance spectra and the decrease of photoluminescence intensity suggest electron transfer from the Ti-hybridized band to the MoOx cluster, which suppresses recombination of the pho- toinduced electron and hole pairs. The photocatalytic activity of Mo-modified HAp samples was attribu- ted to HOMO–LUMO excitation of MoOx cluster.
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