title: Synthesis, characterization, and photodegradation behavior of single-phase anatase TiO2 materials synthesized from Ti-oxychloride precursors.
abstract: Single-phase anatase-TiO2 nanomaterials with a size of ca. 10 nm and variable quantities of anion impurities were prepared using a novel pathway based on the use of amorphous ammonium Ti-oxychloride precursors synthesized using Ti/Cl initial ratios between 1 and 6. The precursor nature and evolution under thermal treatment were studied using chemical analysis, XRD, XPS, DRIFTS, and mass spectrometry. The nature and concentration of anatase-TiO2 materials anion impurities were analyzed by XPS and DRIFTS. It is shown that negatively charged impurities located in substitutional positions of the anatase network are maximized for a sample synthesized using a Ti/Cl 1:1 atomic ratio and are responsible for the elimination of liquid-phase (phenol) and gas-phase (isopropanol or methylcyclohexane) pollutants under sunlight excitation. A link is established among the initial chemical characterization of the precursors, the final morphological, structural, and chemical composition of the oxide materials, and their photochemical properties.
authors.affiliation: Instituto de Ciencia de Materiales de Sevilla, Centro Mixto CSIC-Universidad de Sevilla, C/Americo Vespucio 49, 41092-Sevilla, Spain.
authors.forename: Gerardo
authors.initials: G
authors.lastname: Colón
authors.forename: Patricia
authors.initials: P
authors.lastname: Sampedro
authors.forename: Marcos
authors.initials: M
authors.lastname: Fernández-García
authors.forename: Haiyan
authors.initials: H
authors.lastname: Chen
authors.forename: Jonathan C
authors.initials: JC
authors.lastname: Hanson
authors.forename: Jose A
authors.initials: JA
authors.lastname: Rodriguez
mesh_terms: D002712:Chlorides / Q000737:chemistry; D006358:Hot Temperature; D046529:Microscopy, Electron, Transmission; D009584:Nitrogen / Q000737:chemistry; D010777:Photochemistry; D013057:Spectrum Analysis; D014025:Titanium / Q000737:chemistry*; D014961:X-Ray Diffraction
chemical_list: D002712:Chlorides; C009495:titanium dioxide; D014025:Titanium; D009584:Nitrogen