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

被引：9
|
作者：
Gupta, Narendra M. [1 ]
Kelkar, Sarika [2 ]
Korake, Prakash [1 ]
机构：
[1] Natl Chem Lab, Catalysis Div, Pune 411008, Maharashtra, India
[2] Natl Chem Lab, Phys Chem Div, Pune 411008, Maharashtra, India
来源：
PHOTOCHEMICAL & PHOTOBIOLOGICAL SCIENCES | 2016年 / 15卷 / 06期
关键词：
QUANTUM DOTS; SPECTROSCOPY; PHOTOACTIVITY; NANOPARTICLES; LUMINESCENCE; FLUORESCENCE; PHOSPHATE; RESONANCE; SURFACE; ENERGY;
D O I：
10.1039/c6pp00022c
中图分类号：
Q5 [生物化学]; Q7 [分子生物学];
学科分类号：
071010 ; 081704 ;
摘要：
Anchoring of uranyl species (2-4 mol%) led to the complete quenching of photoluminescence emission and the visible-light-driven water photodissociation activity of TiO2 (Degussa-P25) and a hydrothermally synthesized CdS photocatalyst. Photophysical measurements revealed a fast relaxation and the transfer of photogenerated electrons/energy from the TiO2 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 UO22+ species is responsible for this reverse energy transfer from a wide bandgap semiconductor to a material with a smaller band-to-band energy gap.
引用
收藏
页码：758 / 766
页数：9
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