Phone/Fax: þ86 28 86291132 F-modified C-doped TiO 2 composites (CF-TiO 2 ) were synthesized via a simple sol-gel method by using NaF as the fluorine source followed by heat treatment at 700 8C in nitrogen atmosphere. The as-prepared CF-TiO 2 composites were characterized via transmission electron microscopy, Xray diffraction, N 2 sorption, X-ray photoelectron spectroscopy, UV-Vis diffuse reflectance spectroscopy, and photoluminescence. Carbon was doped into the anatase titania lattice, and the surface of C-doped TiO 2 were modified by fluorine species. The CF-TiO 2 composite showed excellent photocatalytic activity in degrading methylene blue under sunlight and simulated sunlight irradiation.

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A novel solar-driven VO–N–TiO2 (A/R) nanofilm was designed. Its optical absorption can cover the ultraviolet, visible and near-infrared region.

A coral/double-wall TiO 2 nanotube array (coral/DWNT TiO 2 ) film electrode was synthesized via anodic oxidation in an ultrasonic bath in an organic electrolyte containing 1-butyl-3-methylimidazolium tetrafluoroborate ([BMIM][BF 4 ]). The morphology, crystal structure, chemical state, and optical properties of the TiO 2 film were characterized via field emission scanning electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy (XPS), and UV-Vis absorption spectroscopy. The results showed that the film had a unique lower layer DWNT/upper layer coral structure with a mixed phase of anatase and rutile. The XPS results proved that the interstitial nitrogen atoms doped in the TiO 2 crystal lattice as a Ti-O-N bond. The coral/ DWNT TiO 2 film exhibited evident absorption in the range of 400 nm to 800 nm and significant photoelectrocatalytic activity under sunlight.