The quenching effect of uranyl species in the photoluminescence emission and visible-light-driven water dissociation activity of CdS and TiO2 photocatalysts

Anchoring of uranyl species (2–4 mol%) led to the complete quenching of photoluminescence emission and the visible-light-driven water photodissociation activity of TiO 2 (Degussa-P25) and a hydrothermally synthesized CdS photocatalyst. Photophysical measurements revealed a fast relaxation and the tr...

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Bibliographic Details
Published in:Photochemical & photobiological sciences 2016-06, Vol.15 (6), p.758-766
Main Authors: Gupta, Narendra M., Kelkar, Sarika, Korake, Prakash
Format: Article
Language:English
Subjects:
Biochemistry
Biomaterials
Cadmium Compounds - chemistry
Catalysis
Chemistry
Hydrogen - chemistry
Luminescence
Microscopy, Electron, Scanning
Photochemical Processes
Physical Chemistry
Plant Sciences
Semiconductors
Spectrum Analysis
Sulfides - chemistry
Titanium - chemistry
Uranium Compounds - chemistry
Water - chemistry
X-Ray Diffraction
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Summary:Anchoring of uranyl species (2–4 mol%) led to the complete quenching of photoluminescence emission and the visible-light-driven water photodissociation activity of TiO 2 (Degussa-P25) and a hydrothermally synthesized CdS photocatalyst. Photophysical measurements revealed a fast relaxation and the transfer of photogenerated electrons/energy from the TiO 2 or CdS substrate to the acceptor uranyl moieties. Besides the position of flat band levels, significant overlap of the absorption/emission spectra of the host matrix and the surface-bound UO 2 2+ species is responsible for this reverse energy transfer from a wide bandgap semiconductor to a material with a smaller band-to-band energy gap.
ISSN:1474-905X
1474-9092
DOI:10.1039/c6pp00022c