Abstract
The one-step synthesis of oleic acid-coated TiO2 nanoparticles with visible light-driven photocatalytic activity was reported by this manuscript, using oleic acid-ethanol as crucial starting materials. The photocatalytic degradation of nitrogen monoxide (deNOx) in the gas phase was investigated in a continuous reactor using a series of TiO2 semiconductors, prepared from oleic acid- or acetic acid-ethanol solution. The surface modification on TiO2 by organic fatty acid, oleic acid, could reinvest TiO2 photocatalyst with the excellent visible light response. The deNOx ability is almost as high as 30 % destruction in the visible light region (λ > 510 nm) which is similar to the nitrogen-doped TiO2. Meanwhile, acetic acid, a monobasic acid, has a weaker ability on visible light modification of TiO2.Electronic supplementary materialThe online version of this article (doi:10.1186/s11671-015-1133-7) contains supplementary material, which is available to authorized users.
Highlights
Visible light response modification has been one of the most important issues for photocatalysts, since TiO2 has large band gap energy of ca. 3.2 eV, which is active under irradiation of only UV light
The surface modification of a catalyst by dye sensitization or colorless organics, is a good possibility to develop a method of designing a visible light responsive photocatalytic system
The surface modification on TiO2 nanoparticles by oleic acid was conducted through a solvothermal method with controlling the speed of water generation
Summary
Visible light response modification has been one of the most important issues for photocatalysts, since TiO2 has large band gap energy of ca. 3.2 eV, which is active under irradiation of only UV light. One is focused on extending the range of excitation energies into the visible region by doping with elements to produce an excellent visible light responsive photocatalysts, such as N-doped TiO2, Cr-doped SrTiO3, and Taand N-codoped TiO2 [1,2,3,4,5]. Another one, the surface modification of a catalyst by dye sensitization or colorless organics, is a good possibility to develop a method of designing a visible light responsive photocatalytic system. Various colorless organics acids, including ascorbic acid, salicylic acid, 5-sulfosalicylic acid, and so on have been used for the surface modification of
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