Catalytic and photocatalytic activity of lightly doped catalysts M:ZnO (M = Cu, Mn)

Donkova, B.; Dimitrov, Dimitar; Kostadinov, M.; Mitkova, E.; Mehandjiev, D.

doi:10.1016/j.matchemphys.2010.05.015

Cited by 80 publications

(14 citation statements)

References 37 publications

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“…Further the addition of 1.0% H 2 O 2 to optimum doping concentration of as synthesized Mn doped ZnO NPs at pH-8.0, 10.0 and 12.0, fast and quick degradation of CV dye has been observed. The photocatalytic results so obtained are contradictory to others who reported that Cu and Mn doped ZnO NPs show nearly same or lesser photocatalytic activity than undoped ZnO NPs (Milenova et al, 2013;Donkova et al, 2010).…”

Section: Introductioncontrasting

confidence: 92%

Fast and quick degradation properties of doped and capped ZnO nanoparticles under UV–Visible light radiations

2016

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Section: Introductioncontrasting

confidence: 92%

Fast and quick degradation properties of doped and capped ZnO nanoparticles under UV–Visible light radiations

2016

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“…Additionally, ZnO is used as photocatalyst [5,6] and in different catalytic reaction such as steam reforming of alcohols [7,8], synthesis of methanol [9] and complete oxidation of CO [10] and trichloroethylene [11]. Also, doping ZnO with transition metal such as Mn and Cu could affect the electronic surface band structure of ZnO and change its applications [10,12,13].…”

Section: Introductionmentioning

confidence: 99%

Structural and optical properties of ZnO and manganese-doped ZnO

Gallegos

Peluso

Thomas

et al. 2016

Journal of Alloys and Compounds

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The structural, morphological and optical properties of manganese oxides supported on commercial ZnO, prepared by impregnation with manganese nitrate, were investigated. The nominal compositions of Mn in the samples were 5, 10, 15 and 20 %w/w.The Xray diffraction (XRD) experiments revealed the presence of the ZnO wurtzite phase in all the samples, and ZnMnO 3 was also found in the samples with 15 wt% and 20 wt% of Mn. X-ray photoelectron spectroscopy (XPS) showed the presence of Mn 2+ and Mn 4+ in the xMnZnO samples. The results showed that the Mn 2+ ions had

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“…The latter is lowering the band bending on the crystallite surface, which decreases the driving force acting on photogenerated electrons and holes. In this way, it reduces their separation, quenching the photocatalytic activity [46,47].…”

Section: Photocatalytic Activitymentioning

confidence: 99%

Influence of gamma-irradiation on the photocatalytic activity of Degussa P25 TiO2

et al. 2012

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The purpose of this article is to study the influence of gamma irradiation on the sorption capacity and photocatalytic activity of commercially available TiO 2 Degussa P25. The photocatalyst was gamma-irradiated at ambient temperature with doses 8-60 kGy ( 137 Cs, dose rate 2 kGy/24 h) and then stored until analysis/tests in liquid N 2 . X-ray diffraction, SEM, TEM, EPR, and UV-VIS reflectance spectrometry were applied to explore phase composition, crystal cell parameters, crystallite size, textural properties (grain size, and specific surface area), the presence of paramagnetic centers, and UV/VIS absorption of the initial and irradiated samples. The sorption capacity and photocatalytic activity of the products under UVA (17 W, k max = 365 nm) and sunlight irradiation were studied against Malachite Green 10 -5 M aqueous solution, applied as a model pollutant. The sorption capacity varied non-monotonically with the irradiation dose, with clearly expressed maximum and minimum seen at irradiation with doses of 28 and 60 kGy, respectively. The maximum in the photocatalytic activity, both at UV and sunlight illumination, is observed after the dose of 28 kGy is applied; at these conditions, the pollutant degradation rate constant is 1.7/2.7-times higher than the value for the non-irradiated product. The explanation of the obtained results is related mainly to the type and concentration of gamma-generated defects in catalysts, and especially the effect of Ti 3? is discussed. Some of the considered factors may act in opposite directions, causing an extreme point in the relation between the photocatalytic activity and the gamma radiation dose.

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Catalytic and photocatalytic activity of lightly doped catalysts M:ZnO (M = Cu, Mn)

Cited by 80 publications

References 37 publications

Fast and quick degradation properties of doped and capped ZnO nanoparticles under UV–Visible light radiations

Fast and quick degradation properties of doped and capped ZnO nanoparticles under UV–Visible light radiations

Structural and optical properties of ZnO and manganese-doped ZnO

Influence of gamma-irradiation on the photocatalytic activity of Degussa P25 TiO2

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