title: Anodic fabrication of advanced titania nanotubes photocatalysts for photoelectrocatalysis decolorization of Orange G dye.
abstract: Titania nanotubes (TNTs) were fabricated on Ti mesh substrates by the anodizing technique. The effects of preparation variables, such as anodizing voltage, time and calcination temperature on the textural characteristics and photocatalytic activity of TNTs were investigated. The surface morphology, crystalline phase, and chemical composition were analyzed using field emission-scanning electron microscopy and X-ray diffraction. The photo-electrochemical properties of TNTs were examined by voltammetry. The TNTs were tested as a photoanode for advanced oxidation processes, such as photocatalytic, electrocatalytic, and photoelectrocatalytic decolorization of Orange G dye. The well-arranged TNTs electrode prepared in this work showed a high photocurrent density of 101 µA cm(-2) at an optimum length-to-diameter aspect ratio of 31.2. In dye decolorization tests, the electrochemical photocatalytic system using TNTs as the photoanode achieved total decolorization and 64% mineralization under extended reaction time. These results show that TNTs prepared by this method is greatly stable in prolonged use and suitable as a photoanode in the photocatalytic/photoelectrocatalytic treatments of dye wastewater.
authors.affiliation: Institute of Environmental Engineering, National Chiao Tung University, Hsinchu, Taiwan.
authors.forename: Yaju
authors.initials: Y
authors.lastname: Juang
authors.affiliation: Institute of Environmental Engineering, National Chiao Tung University, Hsinchu, Taiwan.
authors.forename: Yijin
authors.initials: Y
authors.lastname: Liu
authors.affiliation: Institute of Environmental Engineering, National Chiao Tung University, Hsinchu, Taiwan.
authors.forename: Ervin
authors.initials: E
authors.lastname: Nurhayati
authors.affiliation: Institute of Environmental Engineering, National Chiao Tung University, Hsinchu, Taiwan.
authors.forename: Nguyen Thi
authors.initials: NT
authors.lastname: Thuy
authors.affiliation: Institute of Environmental Engineering, National Chiao Tung University, Hsinchu, Taiwan. Electronic address: cphuang@mail.nctu.edu.tw.
authors.forename: Chihpin
authors.initials: C
authors.lastname: Huang
authors.affiliation: Department of Chemical Engineering, National Tsing Hua University, Hsinchu, Taiwan. Electronic address: cchu@che.nthu.edu.tw.
authors.forename: Chi-Chang
authors.initials: CC
authors.lastname: Hu
mesh_terms: D001391:Azo Compounds / Q000737:chemistry*; D002384:Catalysis; D004396:Coloring Agents / Q000737:chemistry*; D004566:Electrodes; D004572:Electrolysis; D008855:Microscopy, Electron, Scanning; D043942:Nanotubes / Q000032:analysis* / Q000648:ultrastructure; D010782:Photolysis; D013696:Temperature; D014025:Titanium / Q000032:analysis*; D014865:Waste Disposal, Fluid / Q000295:instrumentation / Q000379:methods*; D014874:Water Pollutants, Chemical / Q000737:chemistry*; D014961:X-Ray Diffraction
chemical_list: D001391:Azo Compounds; D004396:Coloring Agents; D014874:Water Pollutants, Chemical; C009495:titanium dioxide; C008710:Orange G; D014025:Titanium
keywords: Anodizing; Orange G; Photoanode; Photoelectrocatalysis; Titania nanotube