Plasmonic and non-plasmonic contributions on photocatalytic activity of Au-TiO2 thin film under mixed UV–visible light

Highly crystalline titania nano-particles were synthesized by hydrothermal method using novel stable water-soluble titanium complexes. It was confirmed that single phase anatase, rutile and brookite, which can be rarely synthesized as a single phase, can be obtained by varying the ligand in the complex and pH of the aqueous solution. TEM observations and BET specific surface area measurements had shown that these samples consisted of nanosized particles of 5~200 nm and had high specific surface areas of 25~150 m2/g. According to UV-visible diffuse reflectance spectra, these titania samples absorbed light in the visible region (λ > 400 nm). Photocatalytic activities in NO oxidation reaction exhibited by synthesized titania powders under the irradiation by UV- visible light were higher than the activity of the commercial TiO2 photocatalyst P25 (Degussa). Especially, under illumination by only visible light of above 510 nm wavelength, photocatalytic activity of the obtained specimens exceeded that of P25 more than four times. We also clearly demonstrated that single phase brookite had high photocatalytic activity for NO oxidation.

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Investigation of photocatalytic activity of ZnO promoted hydrothermally synthesized ZnWO4 nanorods in UV–visible light irradiation

Chemical Engineering Science ◽

10.1016/j.ces.2019.115338 ◽

2020 ◽

Vol 212 ◽

pp. 115338 ◽

Cited By ~ 9

Author(s):

Devi Prashad Ojha ◽

Han Joo Kim

Keyword(s):

Photocatalytic Activity ◽

Visible Light ◽

Visible Light Irradiation ◽

Light Irradiation ◽

Uv Visible

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Photocatalytic Activity of CuO/ZnO Heterostructure Nanocrystals under UV-Visible Light Irradiation

Materials Science Forum ◽

10.4028/www.scientific.net/msf.787.35 ◽

2014 ◽

Vol 787 ◽

pp. 35-40 ◽

Cited By ~ 2

Author(s):

Xiao Yan Zhou ◽

Peng Wei Zhou ◽

Hao Guo ◽

Bo Yang ◽

Ru Fei Ren

Keyword(s):

Photocatalytic Activity ◽

Visible Light ◽

Visible Light Irradiation ◽

Cuo Nanoparticles ◽

Light Irradiation ◽

Molar Ratio ◽

X Ray Diffraction ◽

X Ray ◽

Vis Spectroscopy ◽

Uv Visible

The p-n junction photocatalysts, p-CuO (at. 0-25%)/n-ZnO nanocomposite were prepared through hydrothermal method without using any organic solvent or surfactant. The as-prepared samples were characterized by X-ray diffraction, scanning electron microscopy, energy dispersive X-Ray spectroscopy, and UV-vis spectroscopy. The results demonstrated that the CuO/ZnO nanocomposite presented a two-dimensional morphology composed of sheet-like ZnO nanostructures adorned with CuO nanoparticles. The photocatalytic activity of CuO/ZnO with different Cu/Zn molar rations and pure ZnO synthesized by the identical synthetic route were evaluated by degrading methylene blue (MB) dye under UV-visible light irradiation. The CuO/ZnO with Cu/Zn molar ratio of 4% exhibits the highest photocatalytic activity compared that of the other photocatalysts under the identical conditions. It is mainly attributed to the increased charge separation rate in the nanocomposite and the extended photo-responding range.

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