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1583872 
Book/Book Chapter 
Photocatalytic decomposition of Methylene Blue with nitrogen-doped TiO sub(2) under visible light irradiation 
Ku, Y; Chen, WJ; Hou, WM 
2013 
Zhonghua Minguo Huanjing Gongcheng Xuehui (Chinese Institute of Environment Engineering) 
23 
1 (Jan 2013) 
15-21 
Nitrogen-doped (N-doped) TiO sub(2) photocatalysts were prepared by chemical vapor deposition method under ammonia atmosphere. The photocatalytic activity of N-doped TiO sub(2) was estimated by decomposing Methylene Blue in aqueous solution with various operating conditions, including solution pH and light source. The morphology, crystal structure, chemical composition and optical characterization of prepared N-doped TiO sub(2) were determined by the field-emission scanning electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy, Brunauer-Emmett-Teller approach, UV-Vis diffuse reflectance spectroscopy and zeta meter. The absorption of N-doped TiO sub(2) powder was extended into visible light regimes with an optical band gap of around 2.89 eV, which enhanced the photocatalytic activity of N-doped TiO sub(2) samples under visible-light illumination. Photocatalytic decomposition of Methylene Blue was increased with increasing solution pH. In alkaline solution, negatively-charged N-doped TiO sub(2) surface enhanced the Methylene Blue decomposition. Methylene Blue decomposition by photocatalytic process was increased by 67 and 30% for experiments conducted with irradiation of blue (463 nm) and green (523 nm) light. 
Irradiation; X-ray diffraction; Absorption; Microscopy; Vapors; Decomposition; Spectroscopy; pH; Ammonia