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Photocatalytic Activity of Ni 8 wt%‐Doped TiO 2 Photocatalyst Synthesized by Mechanical Alloying Under Visible Light
Author(s) -
Hyun Kim Dong,
Sub Lee Kyung,
Kim YoonSuk,
Chung YongChae,
Kim SunJae
Publication year - 2006
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2005.00782.x
Subject(s) - materials science , photocatalysis , visible spectrum , titanium dioxide , rutile , doping , photoluminescence , band gap , diffuse reflectance infrared fourier transform , absorption (acoustics) , absorption edge , spectroscopy , absorption spectroscopy , analytical chemistry (journal) , photochemistry , chemical engineering , optoelectronics , optics , chemistry , composite material , organic chemistry , catalysis , physics , quantum mechanics , engineering
Ni 8 wt%‐doped titanium dioxide (TiO 2 ) was synthesized by mechanical alloying. The photocatalytic activity of Ni 8 wt%‐doped TiO 2 powder was evaluated by measuring the visible light absorption ability by ultraviolet visible diffuse reflectance spectroscopy (UV/Vis‐DRS) and photoluminescence (PL) spectroscopy. Ni 8 wt%‐doped TiO 2 powders had only a rutile phase and spherical particles with an average grain size of less than 10 nm. The UV/Vis‐DRS analysis showed that the UV absorption for the Ni 8 wt%‐doped TiO 2 powder moved to a longer wavelength and the photoreactivity was rapidly enhanced. And PL results revealed that the new absorption was believed to be induced by localization of the trapping level near the valance band or conduction band. Moreover, Ni 8 wt%‐doped TiO 2 had a high reaction activity for decomposition of 4‐chlorophenol in aqueous solution under UV and visible light. To obtain the electronic structure of Ni‐doped TiO 2 , we have performed ab initio pseudopotential plane wave methods based on the density functional theory. The band gap of Ni‐doped TiO 2 narrowed more than pure TiO 2 . These results agree with the experimentally observed phenomenon.