title: Decomposition of 3-chlorophenol on nitrogen modified TiO2 photocatalysts.
abstract: Photocatalytic activity of nitrogen modified TiO(2) calcined at temperatures of 100-350°C toward 3-chlorophenol (3-CP) degradation was studied. In the experiments the fluorescent UV lamp and the incandescent lamp emitting mainly Vis light were applied. The degradation efficiency was evaluated on a basis of changes of 3-CP, total organic carbon and Cl(-) concentration. A significant improvement of the photoactivity of the N-modified photocatalysts compared to the reference sample was observed. The rate of 3-CP degradation increased with the calcination temperature, and the highest efficiency was achieved for TiO(2) annealed at 350°C. After 5h of UV irradiation in the presence of TiO(2)/N-350 and reference TiO(2) the 3-CP concentration decreased for 77% and 36%, respectively. The 3-CP removal after 24h of Vis irradiation was 30% and 12% for the N-modified and reference samples, respectively. The 3-CP decomposition and mineralization were greatly influenced by pH of the solution, achieving the highest rate at pH 7 for the modified photocatalysts. An increase of the calcination temperature resulted in an increase of the rate of OH formation. The photocatalytic activity of the N-modified TiO(2) remained unchanged during repeated photocatalytic degradation cycles.
authors.affiliation: West Pomeranian University of Technology, Institute of Chemical and Environment Engineering, Department of Water Technology and Environment Engineering, ul. Pułaskiego 10, 70-322 Szczecin, Poland. sylwia.mozia@zut.edu.pl
authors.forename: Sylwia
authors.initials: S
authors.lastname: Mozia
authors.forename: Kamila
authors.initials: K
authors.lastname: Bubacz
authors.forename: Magdalena
authors.initials: M
authors.lastname: Janus
authors.forename: Antoni W
authors.initials: AW
authors.lastname: Morawski
mesh_terms: D002384:Catalysis; D002733:Chlorophenols / Q000737:chemistry*; D009584:Nitrogen / Q000737:chemistry*; D010777:Photochemistry; D014025:Titanium / Q000737:chemistry*; D014466:Ultraviolet Rays
chemical_list: D002733:Chlorophenols; C009495:titanium dioxide; D014025:Titanium; D009584:Nitrogen; C030682:3-chlorophenol