A preliminary comparison between hydrogenase and oxygen as electron acceptors in irradiated aqueous dispersion of titanium dioxide

Mura, Giovanni Maria; Ganadu, Maria Luisa; Lombardi, Paolo; Lubinu, Giuseppe; Branca, Mario; Maida, Valeria

doi:10.1016/s1010-6030(02)00043-6

Cited by 17 publications

(6 citation statements)

References 23 publications

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“…The photocatalytic mechanism occurs whereby oxygen adsorbed on the surface of photocatalyst can trap the photogenerated electron, 39 and the electron transfer to oxygen may be the rate-determining step in semiconductor photocatalysis. 40 However, Ce 4+ easily traps the photo-excited electron in the system of Ce-doped samples, because Ce 4+ ion, as a Lewis acid, apparently is superior to the oxygen molecule (O 2 ) in its capability of trapping electrons. 41 The electrons trapped in Ce 4+ sites are subsequently transferred to the adsorbed O 2 by an oxidation process, so the simple recombination between electrons and holes is reduced (eqn ( 5) and ( 6)): Ce 4+ + e À -Ce 3+…”

Section: Mechanism Of Degradationmentioning

confidence: 99%

Synthesis of Ce co-doped Ag–ZnO photocatalyst with excellent performance for NBB dye degradation under natural sunlight illumination

Subash

Krishnakumar

Velmurugan

et al. 2012

Catal. Sci. Technol.

199

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Section: Mechanism Of Degradationmentioning

confidence: 99%

Synthesis of Ce co-doped Ag–ZnO photocatalyst with excellent performance for NBB dye degradation under natural sunlight illumination

Subash

Krishnakumar

Velmurugan

et al. 2012

Catal. Sci. Technol.

199

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“…And then, the photocatalytic activity of Ce-TiO 2 nanotubes decreases with the increasing of Ce-doped content. It is known from the photocatalytic mechanism that oxygen adsorbed on the surface of photocatalyst can trap the photogenerated electron [34], and the electron transfer to oxygen may be the rate-determining step in semiconductor photocatalysis [35]. However, Ce 4+ easily traps the photo-excited electron in the system of Ce-doped samples, because Ce 4+ ion, as a Lewis acid, apparently is superior to the oxygen molecule (O 2 ) in the capability of trapping electrons [36].…”

Section: Drs Analysismentioning

confidence: 99%

Preparation of titania nanotubes doped with cerium and their photocatalytic activity for glyphosate

Xue

Zhang

et al. 2011

Chemical Engineering Journal

108

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“…When the property of dark adsorption is taken into account, the dark adsorption of Ce-ZnO and Ag-ZnO is lower than that of the dark adsorption process of Ce-Ag-ZnO. This activity improves the photocatalytic synergetic activity action between Ag and Ce in ZnO [40,41]. It is clearly expressed that the photocatalytic activity of semiconductor is lower than that of the phtotcatalytic activity of Ce-Ag-ZnO photocatalyst.…”

Section: 1mentioning

confidence: 99%

Photocatalytic Detoxification of NBB Dye Over Cerium Loaded Ag–ZnO Photocatalyst Under UV-A Light Irradiation

Subash¹,

Shanthi²

2017

DJ JECF

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The Ce co-doped Ag-ZnO, expresses the photocatalyst Ce-Ag-ZnO, which was effectively produced by a simple solvothermal technique. In this catalytic process, several properties of the catalysts were taken into account to check that the catalyst gets characterized properly. These catalytic properties include X-ray Diffraction (XRD), Field Emission Scanning Electron Microscope (FE-SEM) images, Energy Dispersive Spectrum (EDS), Diffuse Reflectance Spectra (DRS), PhotoLuminescence spectra (PL), Cyclic Voltammetry (CV) and BET surface area measurements. In our research work, the process done in solvothermal method, which synthesized Ce co-doped Ag-ZnO, the so called photocatalyst Ce-Ag-ZnO, showed a positive effect. A part of our vision to find the phototcatalytic activity of Ce-Ag-ZnO was carried out for the degradation process of Naphthol Blue Black (NBB) dye in aqueous solution as a medium under the irradiation of UV-A light. The ZnO which was present, absorbed in UV and visible region were shifted by the co-dopants. For the process of mineralization of NBB dye under UV-A light at pH value 9, the efficient one was proved to be CeAg-ZnO when compared with Ag-ZnO, Ce-ZnO, commercial ZnO, prepared ZnO, TiO 2 -P25 and TiO 2 (Merck). The impacts of operational parameters like, the amount of photocatalyst technically called as photocatalytic dosage, the concentration of the dye and initial pH value on photo mineralization of NBB dye were examined. The Chemical Oxygen Demand (COD) measurements also proved the mineralization process of Naphthol Blue Black (NBB) dye. Under UV-A light, the degradation of naphthol blue black dye is done by a degradation mechanism. The catalyst is finally proved to have the property of reusability.

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A preliminary comparison between hydrogenase and oxygen as electron acceptors in irradiated aqueous dispersion of titanium dioxide

Cited by 17 publications

References 23 publications

Synthesis of Ce co-doped Ag–ZnO photocatalyst with excellent performance for NBB dye degradation under natural sunlight illumination

Synthesis of Ce co-doped Ag–ZnO photocatalyst with excellent performance for NBB dye degradation under natural sunlight illumination

Preparation of titania nanotubes doped with cerium and their photocatalytic activity for glyphosate

Photocatalytic Detoxification of NBB Dye Over Cerium Loaded Ag–ZnO Photocatalyst Under UV-A Light Irradiation

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