4.7 Article

Decomposition of 3-chlorophenol on nitrogen modified TiO2 photocatalysts

Journal

JOURNAL OF HAZARDOUS MATERIALS
Volume 203, Issue -, Pages 128-136

Publisher

ELSEVIER SCIENCE BV
DOI: 10.1016/j.jhazmat.2011.11.088

Keywords

Photocatalysis; Nitrogen; TiO2; Visible light; Hydroxyl radicals

Funding

  1. National Centre for Science
  2. Ministry of Science and Higher Education of Poland [MNiSW/DPN/4878/TD/2010]

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Photocatalytic activity of nitrogen modified TiO2 calcined at temperatures of 100-350 degrees 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 TiO2 annealed at 350 degrees C. After 5 h of UV irradiation in the presence of TiO2/N-350 and reference TiO2 the 3-CP concentration decreased for 77% and 36%. respectively. The 3-CP removal after 24 h 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 center dot OH formation. The photocatalytic activity of the N-modified TiO2 remained unchanged during repeated photocatalytic degradation cycles. (C) 2011 Elsevier B.V. All rights reserved.

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