期刊
CATALYSTS
卷 12, 期 12, 页码 -出版社
MDPI
DOI: 10.3390/catal12121585
关键词
Ag-In-Zn-S quantum dots; heterostructured photocatalyst; photodegradation; visible light; ZnO rods
资金
- European Union
- Centre-Val de Loire Region (FEDER)
Heterostructured photocatalysts combining ZnO nanorods sensitized by quaternary Ag-In-Zn-S quantum dots show high activity in the bleaching of Acid Orange 7 dye under visible light irradiation. The catalyst with 10 wt% AIZS QDs exhibits the highest activity and stability.
Heterostructured photocatalysts associating ZnO nanorods (NRs) sensitized by quaternary Ag-In-Zn-S (AIZS) quantum dots (QDs) were prepared by depositing AIZS QDs at the surface of ZnO NRs followed by thermal treatment at 300 degrees C. The ZnO/AIZS catalysts were characterized by X-ray diffraction, electron microscopy, UV-vis diffuse spectroscopy and by photoelectrochemical measurements. Their photocatalytic activity was evaluated for the bleaching of the Acid Orange 7 (AO7) dye under visible light irradiation. Results show that the association of ZnO NRs with 10 wt% AIZS QDs affords the photocatalyst the highest activity due to the enhanced visible light absorption combined with the improved charge separation. The ZnO/AIZS(10) photocatalyst degrades 98% AO7 in 90 min under visible light illumination, while ZnO NRs can only decompose 11% of the dye. The ZnO/AIZS(10) photocatalyst was also found to be stable and can be reused up to eight times without significant alteration of its activity. This work demonstrates the high potential of AIZS QDs for the development of visible light active photocatalysts.
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