摘要
In this paper, CdS quantum dots sensitized TiO2 composite powders （QD-CdS/TiO2） were synthesized by impregnating TiO2 powder into CdS sol with different concentrations. X-ray diffraction pattern （XRD） shows the crystal structures of CdS and TiO2 are cubic phase and anatase phase separately in QD- CdS/TiO2 powder samples; the crystal size of CdS in QD- CdS/TiO2 is about 3-7 nm, while TiO2 crystal size is about 20 nm. With increasing CdS content in QD-CdS/TiO2 composite, the UV-Vis absorption spectrum shifted to the longer wavelength lines, exhibiting obvious quantum size effect. The fluorescence intensity of QD-CdS/TiO2 irradiated by blue light is weaker than that of pure CdS. When the molar ratio of CdS and TiO2 is about 1∶2, the QD-CdS/TiO2 powder has the best catalytic properties under visible-light irradiation, and the degradation rate of rhodamine B （RhB） is up to 92.2% within 60 min.
In this paper, CdS quantum dots sensitized TiO2 composite powders （QD-CdS/TiO2） were synthesized by impregnating TiO2 powder into CdS sol with different concentrations. X-ray diffraction pattern （XRD） shows the crystal structures of CdS and TiO2 are cubic phase and anatase phase separately in QD- CdS/TiO2 powder samples; the crystal size of CdS in QD- CdS/TiO2 is about 3-7 nm, while TiO2 crystal size is about 20 nm. With increasing CdS content in QD-CdS/TiO2 composite, the UV-Vis absorption spectrum shifted to the longer wavelength lines, exhibiting obvious quantum size effect. The fluorescence intensity of QD-CdS/TiO2 irradiated by blue light is weaker than that of pure CdS. When the molar ratio of CdS and TiO2 is about 1∶2, the QD-CdS/TiO2 powder has the best catalytic properties under visible-light irradiation, and the degradation rate of rhodamine B （RhB） is up to 92.2% within 60 min.
基金
Supported by the National Science Fund for Talent Training in Basic Science (J0830310)
the Fundamental Research Funds for the Central Universities (017)
