title: Synthesis and characterization of N-modified titania nanotubes for photocatalytic applications.
abstract: The modification of titanate nanotubes (TiNT) with nitrogen (NTiNT) was accomplished through impregnation method. TiNT were synthesized via hydrothermal treatment of titania powders in NaOH solution at 130 °C for 48 h. The obtained samples were characterized by UV-Vis absorption spectroscopy, Brunauer-Emmett-Teller (BET) surface area, XRD, TEM, XPS, and TG analysis. Structure, morphology, composition, and visible light absorption property of nitrogen-modified TiO2 nanotubes are found to depend on the nitrogen content and not on the calcination temperature for the range used in this work. The photocatalytic activity of these nanotubes was investigated for the degradation of methylethylketone (MEK) and hydrogen sulfide (H2S) under ultraviolet and solar light radiation. MEK is very resistant to photocatalytic degradation with the prepared materials;, however, the results show that modification of the TiNT with nitrogen in a proportion of 1 to 1 (TiNT to urea weight ratio) and calcination at 400 °C lead to materials with high photocatalytic activity under ultraviolet radiation and moderate photocatalytic activity under solar radiation for degradation of H2S.
authors.affiliation: LSRE-Laboratory of Separation and Reaction Engineering, Associate Laboratory LSRE/LCM, Faculdade de Engenharia, Universidade do Porto, Rua Dr. Roberto Frias, 4200-465, Porto, Portugal.
authors.forename: Ricardo A R
authors.initials: RA
authors.lastname: Monteiro
authors.forename: Filipe V S
authors.initials: FV
authors.lastname: Lopes
authors.forename: Rui A R
authors.initials: RA
authors.lastname: Boaventura
authors.forename: Adrián M T
authors.initials: AM
authors.lastname: Silva
authors.forename: Vítor J P
authors.initials: VJ
authors.lastname: Vilar
mesh_terms: D002074:Butanones / Q000737:chemistry; D002384:Catalysis; D006358:Hot Temperature; D006862:Hydrogen Sulfide / Q000737:chemistry; D008027:Light; D043942:Nanotubes / Q000737:chemistry*; D009584:Nitrogen / Q000737:chemistry*; D010782:Photolysis; D013056:Spectrophotometry, Ultraviolet; D014025:Titanium / Q000737:chemistry*; D014466:Ultraviolet Rays
chemical_list: D002074:Butanones; C009495:titanium dioxide; C005222:methylethyl ketone; D014025:Titanium; D009584:Nitrogen; D006862:Hydrogen Sulfide