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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.
X-ray diffraction pattern (XRD) shows the crystal structures of CdS and TiO2 are cubic phase (QD-CdS / TiO2) with increasing TiO2 content of QD-CdS / TiO2 powder samples; the crystal size of CdS in QD-CdS / TiO2 is about 3-7 nm, while the TiO2 crystal size is about 20 nm. composite, the UV-Vis absorption spectrum shifted to the longer wavelength lines, exhibiting a significantly quantum size effect. The fluorescence intensity of QD-CdS / TiO2 irradiated by blue light is weaker than that of pure CdS. 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.