Abstract
CdS modified mesoporous titania core-shell spheres (CdS/CS-TiO2) with enhanced visible-light activity were synthesized by an in situ method. This method included two steps: planting CdO into the framework of anatase TiO2 core-shell spheres and then converting it to CdS by ion-exchange. The physicochemical properties of the obtained samples were investigated by X-ray diffraction, scanning electron microscopy, transmission electronic micrograph, UV–vis diffuse reflectance spectra and nitrogen sorption. The in situ strategy resulted in CdS quantum dots highly dispersed in CS-TiO2 without destroying the mesoporous core-shell structure. Compared with CS-TiO2, the as-synthesized samples exhibited stronger visible-light absorption capability and greatly enhanced photocatalytic activity toward the degradation of Rhodamine B and 4-chlorophenol aqueous solution under visible light irradiation (λ > 420 nm).
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Acknowledgments
This work was supported by the Program for Professor of Special Appointment (Eastern Scholar) at Shanghai Institutions of Higher Learning, the National Natural Science Foundation of China (21007040, 21047009), and the Programmes of Shanghai Municipality (11PJ1407500, 11SG42, 10160503200, DXL122, S30406).
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Jiang, B., Yang, X., Li, X. et al. Core-shell structure CdS/TiO2 for enhanced visible-light-driven photocatalytic organic pollutants degradation. J Sol-Gel Sci Technol 66, 504–511 (2013). https://doi.org/10.1007/s10971-013-3038-1
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DOI: https://doi.org/10.1007/s10971-013-3038-1