The Experts below are selected from a list of 146853 Experts worldwide ranked by ideXlab platform
Shi-zhao Kang - One of the best experts on this subject based on the ideXlab platform.
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Effect of montmorillonite on the Photocatalytic Activity of TiO2 nanoparticles
Desalination, 2010Co-Authors: Shi-zhao KangAbstract:Abstract In the present work, the degradation of methyl orange in water was used to examine the effect of montmorillonite on the Photocatalytic Activity of TiO 2 nanoparticles (P25). Meanwhile, the role which montmorillonite plays in the photocatalysis was explored with UV–visible diffuse reflectance spectra (DRS) and electrophoresis. It is found that montmorillonite can inhibit the Photocatalytic decomposition of methyl orange, but the Photocatalytic Activity of P25 will be enhanced obviously at a certain concentration of montmorillonite. The enhanced Photocatalytic Activity might be ascribed to the light scattering induced by the montmorillonite particles. Additionally, the effect of montmorillonite on the Photocatalytic Activity of P25 was studied as functions of pH of the solution, initial concentration of methyl orange, and reaction atmosphere.
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Effect of C60 on the Photocatalytic Activity of TiO2 Nanorods
The Journal of Physical Chemistry C, 2009Co-Authors: Yingzhao Long, Yan Huang, Yingchun Peng, Shi-zhao KangAbstract:C60-incorporated TiO2 nanorods were prepared in a hydrothermal process. Rhodamine B (RhB) as a model pollutant was used to probe the Photocatalytic Activity of products. The results showed that the Photocatalytic Activity of TiO2 nanorods incorporated with C60 under visible light irradiation markedly increased by a factor of approximately 3.3 when compared with pure TiO2 nanorods and approximately 2.7 when compared with Degussa P25, respectively. The enhanced Photocatalytic Activity under visible light irradiation may be ascribed to an effective separation of the photoexcited electrons due to the addition of C60.
R Cukeva - One of the best experts on this subject based on the ideXlab platform.
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design and Photocatalytic Activity of nanosized zinc oxides
Applied Surface Science, 2016Co-Authors: M Gancheva, M Markovavelichkova, Gabriela Atanasova, Daniela Kovacheva, Iva Uzunov, R CukevaAbstract:Abstract Zinc oxide particles with various morphologies were successfully prepared via three synthesis methods: precipitation; tribophysical treatment and sonochemistry. The as-synthesized samples were characterized by X-ray diffraction (XRD); infrared spectroscopy (IR); scanning electron microscope (SEM); BET specific surface area; electron-paramagnetic resonance (EPR), UV–Vis absorption/diffuse reflectance and X-ray photoelectron spectroscopy (XPS). Photocatalytic activities of the samples were evaluated by degradation of Malachite Green (MG) in an aqueous solution under UV and visible irradiation. The obtained ZnO powders possess crystallites size below 20 nm. The ZnO with spherical particles were obtained by precipitation method. The sonochemistry approach leads to preparation of ZnO with nanorod particles. The calculated band gaps of various ZnO powders belong to the range from 3.12 to 3.30 eV. The obtained polycrystalline zinc oxides exhibit good Photocatalytic Activity which is strongly influenced by the preparation conditions. The nanorod ZnO exhibits high Photocatalytic Activity under UV irradiation which is attributed to the morphology and the geometric surface of the particles. The ZnO obtained by precipitation has better Photocatalytic efficiency under visible irradiation due to high B.E.T. specific surface area and the low level of band gap. Tribophysical treatment of a particle size-homogeneous system leads to deterioration of the Photocatalytic Activity of the material.
Yuan Yuan - One of the best experts on this subject based on the ideXlab platform.
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energy absorption based explanation of the Photocatalytic Activity enhancement mechanism of tio2 nanofibers
International Journal of Hydrogen Energy, 2019Co-Authors: Zhaohui Ruan, Yudong Li, Yuan YuanAbstract:Abstract As is reported, the Photocatalytic Activity will increase significantly when TiO2 nanoparticles are agglomerated into TiO2 nanofibers (NFs), but the Photocatalytic Activity enhancement mechanisms are still not fully understood. As is widely accepted, the optical absorption process plays a key role in photocatalysis, and it can even be said that the optical absorption capability of the photocatalyst directly determines its Photocatalytic Activity, while the influence of the structure on the optical absorption characteristics of TiO2 has largely been ignored in the existing explanations. In this paper, optical simulations are introduced into analyzing optical characteristics of TiO2 Nanofibers with which, the Photocatalytic Activity enhancement mechanism is further discussed, and a Photocatalytic Activity enhancement mechanism of TiO2 Nanofibers is proposed.
A. Wold - One of the best experts on this subject based on the ideXlab platform.
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Surface Acidity and Photocatalytic Activity of Nb2O5/TiO2 Photocatalysts
Journal of Solid State Chemistry, 1995Co-Authors: H. Cui, K. Dwight, S. Soled, A. WoldAbstract:Samples of Nb2O5/TiO2 mixed oxide powders were prepared by the incipient wetness method. The Photocatalytic activities of TiO2 based catalysts were evaluated by the degradation of 1,4-dichlorobenzene (DCB). The addition of Nb2O5 to TiO2 greatly increased its Photocatalytic Activity and also increased the catalyst's surface acidity, as determined by the n-butylamine titration method. A correlation between the maximum Photocatalytic Activity and the number and strength of acid sites were observed. Consequently, the same structural feature that enhances the adsorption of n-butylamine appears to promote the catalytic Activity.
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Effect of Silver on the Photocatalytic Activity of TiO2
Journal of Solid State Chemistry, 1993Co-Authors: Wan In Lee, H. S. Shen, K. Dwight, A. WoldAbstract:Silver was deposited on TiO[sub 2] powders (Degussa P25) by the photodecomposition of two different silver salts, AgF and AgNO[sub 3]. The Photocatalytic Activity of TiO[sub 2] powder samples was evaluated by the degradation of 1,4-dichlorobenzene (DCB). Photodecomposition of AgF on TiO[sub 2] gave higher Photocatalytic Activity than that of AgNO[sub 3]. The optimum catalytic Activity found by the deposition of Ag was comparable to that obtained from Au. It was also observed that the Photocatalytic Activity of Ag-loaded TiO[sub 2] films was greater than that obtained for pure TiO[sub 2] films. This result is consistent with the results obtained for Ag-deposited TiO[sub 2] powders.
K. Muraleedharan - One of the best experts on this subject based on the ideXlab platform.
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Photocatalytic Activity of ZnO and Sr2+ doped ZnO nanoparticles
Journal of Water Process Engineering, 2017Co-Authors: Nimisha N. Kumaran, K. MuraleedharanAbstract:Abstract The Photocatalytic Activity of ZnO and Sr2+ doped ZnO nanoparticles was evaluated by photocatalyic oxidation of methyl orange and methylene blue. The results show that the Photocatalytic Activity of Sr2+ doped ZnO was much higher than that of pure ZnO. The sample with mole ratio of Sr/Zn 1:2 show the maximum Activity. The effect of heat treatment on Photocatalytic Activity of the samples was studied in the temperature range 400–800° C and found that the sample calcined at 600° C shows the maximum Activity. The dependence of calcination time on the photo-catalytic Activity was studied and observed that the best heat treatment time is 7 h.
