title: The combination of rotating disk photocatalytic reactor and TiO2 nanotube arrays for environmental pollutants removal.
abstract: A combined photocatalytic system on one single TiO(2)-nanotube (TNT)/Ti photocatalyst, which was indeed the functional combination of photon-efficient thin-film and conventional bulk-phase photocatalysis processes, was effectively developed in rotating disk photocatalytic reactor for environmental purification applications. The TNT/Ti rotating disk, of uniform size and well-aligned, was successfully prepared by direct anodic oxidation on a dominantly large surface area of 38 cm(2), compared to the typical 1 cm(2) in available literature. To estimate the potentials of combined photocatalytic system for environmental applications, the degradation of rhodamine B was carried out under the optimized conditions, a substrate removal efficiency of nearly 90% and a mineralization efficiency of 56% were observed for initial 20 mg/L solution after 3 h treatment. Compared with the combined photocatalytic system on TiO(2) nanoparticle disk, a significant improvement in substrate removal efficiency of about 25-40% was observed on TNT/Ti disk. It was confirmed that the main degradation of rhodamine B occurred on the upper half of TNT/Ti disk above the heavily colorized sample solution, which was attributed to the superior UV utilization efficiency and the resultant high interfacial photoactivity.
authors.affiliation: Key Laboratory of Pollution Processes and Environmental Criteria of Ministry of Education, College of Environmental Science and Engineering, Nankai University, Tianjin 300071, PR China.
authors.forename: Aiyong
authors.initials: A
authors.lastname: Zhang
authors.forename: Minghua
authors.initials: M
authors.lastname: Zhou
authors.forename: Lu
authors.initials: L
authors.lastname: Han
authors.forename: Qixing
authors.initials: Q
authors.lastname: Zhou
mesh_terms: D002384:Catalysis; D004563:Electrochemistry; D004785:Environmental Pollutants / Q000302:isolation & purification*; D007202:Indicators and Reagents; D008855:Microscopy, Electron, Scanning; D046529:Microscopy, Electron, Transmission; D037742:Nanotubes, Carbon / Q000737:chemistry*; D010777:Photochemistry; D013056:Spectrophotometry, Ultraviolet; D014025:Titanium / Q000737:chemistry*; D014465:Ultrasonics; D014961:X-Ray Diffraction
chemical_list: D004785:Environmental Pollutants; D007202:Indicators and Reagents; D037742:Nanotubes, Carbon; C009495:titanium dioxide; D014025:Titanium