Mesoporous TiO 2 and La x / TiO 2 nano-fiber were prepared by loading titanium( Ti4+),or titanium( Ti4+) and lanthanum( La3+) on collagen fiber template,respectively,and then heat treated. The physicochemical properties of these nano-fibers were fully characterized by means of field emission scanning electron microscopy( FESEM),N 2 adsorption-desorption,X-ray diffraction( XRD),photoluminescence spectra( PL) and UV-Vis absorption spectra. It was found that the fibrous morphology of collagen fiber was well pr...