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The nanotubes of mixed TiO 2 (B) and anatase phases, obtained by hydrothermal synthesis and subsequent calcination, are modified with NiO nanoparticles. In the modified products, NiO nanoparticles with poor crystallinity exist inside titania tubes and are attached to the outside surface of the nanotubes according to X-ray diffraction (XRD), transmission electron microscopy (TEM) and energy...