Preparation, characterization and photocatalytic activity of Co-doped ZnO powders

In the present study, undoped ZnO and CdZnO nanostructures with different weight ratios of cadmium were synthesized by the sol-gel method. Structural and optical properties were investigated by Fourier transform spectroscopy, UV-Vis spectroscopy, scanning electron microscopy, energy-dispersive analytical X-ray, X-ray diffraction, and photoluminescence spectroscopy methods. Moreover, the direct band gap is calculated by Tauc's approach. Furthermore, photocatalytic activity of all samples has been investigated under UV irradiation in an aqueous medium. Compared with pure ZnO, the band gap of the Cd-ZnO decreases and depends on the content of dopants. In addition, photocatalytic activity improves in the presence of a small amount (5 wt%) of cadmium dopant. Graphical Abstract

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“…All samples are of similar size and morphology [10]. Figure 4a illustrates a typical FESEM image of the ZnO-Cd (0.05) sample.…”

Section: Sample Characterizationmentioning

confidence: 99%

“…Therefore, doping transitional metal ions offers promising opportunities in order to shift the optical absorption of ZnO into the visible region and prevent charges from the recombination on the photocatalyst surfaces [10,11].…”

Section: Introductionmentioning

confidence: 99%

Optical, structural, and photocatalytic properties of Cd-doped ZnO powders prepared via sol–gel method

Khodadadi

Bordbar

Yeganeh-Faal³

2015

J Sol-Gel Sci Technol

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“…The photocatalytic reactor consists of a glass tube with an inlet tube for provision of air purging during photocatalysis and outlet tube for the collection of samples from the reactor at regular time intervals. 0.2 g of the assynthesized photocatalyst powder and 100 mL of aqueous solution of TB (25 ppm) were taken in the reactor tube and the suspension was stirred in dark for 30 min to obtain adsorption/desorption equilibrium before irradiating the dye in the reactor [15]. The UV lamp (Philips) that predominantly emit at 254 nm with the definite power 12 W, 230 V and 50 Hz frequency was employed as UV source and tungsten lamp (TORCH) with definite power 40 W, 220 V, 0.18 A and 50 Hz frequency was employed as visible source, and positioned parallel to the reactor.…”

Section: Photocatalytic Degradation Studiesmentioning

confidence: 99%

Cr-N co-doped ZnO nanoparticles: synthesis, characterization and photocatalytic activity for degradation of thymol blue

Nibret¹,

Yadav²,

Dı́az³

et al. 2015

Bull. Chem. Soc. Eth.

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ABSTRACT.Here we report the synthesis of CrN co-doped ZnO for the first time. Zinc oxide (ZnO) nanoparticles were synthesized by direct precipitation method via the reaction between zinc nitrate [Zn(NO3)2 .6H2O] and ammonium carbonate [(NH4)2CO3] in aqueous solutions with proper concentration. Modified photocatalysts were synthesized by the incipient wetness impregnation method (chromium-doped ZnO) and by solid state reactions using ZnO and urea as precursors (nitrogen-doped ZnO). Chromium-nitrogen co-doped ZnO nanomaterials were prepared from the already prepared N-doped ZnO nanomaterials via one step impregnation method. The as-synthesized photocatalysts were investigated by XRD, BET, SEM-EDX, FTIR, and UV-Vis techniques. Photocatalytic degradation of thymol blue using as-synthesized photocatalysts was studied under visible as well as UV irradiations. Highest photocatalytic degradation efficiency of chromium-nitrogen co-doped zinc oxide could be attributed to the lower rate of recombination of the photo-generated electrons and holes as well as to its lower band gap energy as the result of the co-doping. Photocatalytic degradation is found to follow pseudo first order kinetics.

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“…Photocatalysis has been intensively investigated in recent years [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17]. In a photocatalytic process, electron-hole pairs are generated under illumination, followed by oxidation and/or reduction reactions at the surface of the photocatalyst [1].…”

Section: Introductionmentioning

confidence: 99%

“…Activity under solar illumination has also been reported [1], although efficiency is expected to be low since it can only absorb UV A and UV B solar radiation [2]. A number of materials have been investigated as an alternative to TiO 2 , including ZnO [2,8,[13][14][15][16]. ZnO exhibits similar [2] or better [8,13] activity compared to titania, but it is also less stable compared to titania [2] and susceptible to photocorrosion [8].…”

Section: Introductionmentioning

confidence: 99%

ZnO and TiO2 1D nanostructures for photocatalytic applications

Guo

Fung

Fang

et al. 2011

Journal of Alloys and Compounds

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Preparation, characterization and photocatalytic activity of Co-doped ZnO powders

Cited by 148 publications

References 18 publications

Optical, structural, and photocatalytic properties of Cd-doped ZnO powders prepared via sol–gel method

Optical, structural, and photocatalytic properties of Cd-doped ZnO powders prepared via sol–gel method

Cr-N co-doped ZnO nanoparticles: synthesis, characterization and photocatalytic activity for degradation of thymol blue

ZnO and TiO2 1D nanostructures for photocatalytic applications

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