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        Synthesis of Cd<sub>1-x</sub>Zn<sub>x</sub>S/K<sub>4</sub>Nb<sub>6</sub>O<sub>17</sub> Composite and its Photocatalytic Activity for Hydrogen Production

        Liang, Yinghua,Shao, Meiyi,Liu, Li,Hu, Jinshan,Cui, Wenquan Korean Chemical Society 2014 Bulletin of the Korean Chemical Society Vol.35 No.4

        $Cd_{1-x}Zn_xS$-sensitized $K_4Nb_6O_{17}$ composite photocatalysts (designated $Cd_{1-x}Zn_xS/K_4Nb_6O_{17}$) were prepared via a simple deposition-precipitation method. The samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), energy dispersive X-ray spectrometry (EDS), $N_2$ sorption, ultraviolet-visible light diffuse reflectance spectroscopy (UV-Vis DRS), photoluminescence measurements (PL), and X-ray photoelectron spectroscopy (XPS). The $Cd_{0.8}Zn_{0.2}S$ particles were scattered on the surface of $K_4Nb_6O_{17}$, and had a relatively uniform size distribution around 50 nm. The absorption edge of $K_4Nb_6O_{17}$ was shifted to the visible light region and the recombination of photo-generated electrons and holes suppressed after $Cd_{0.8}Zn_{0.2}S$ loading. The $Cd_{0.8}Zn_{0.2}S$(25 wt %)/$K_4Nb_6O_{17}$ composite possessed the highest photocatalytic activity for hydrogen production under visible light irradiation, evolving 8.278 mmol/g in 3 h. Recyclability tests were performed, and the composite photocatalysts were found to be fairly stable. The mechanism of charge separation between the photogenerated electrons and holes at the $Cd_{0.8}Zn_{0.2}S/K_4Nb_6O_{17}$ composite was discussed.

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        Synthesis of Cd1-xZnxS/K4Nb6O17 Composite and its Photocatalytic Activity for Hydrogen Production

        Yinghua Liang,Meiyi Shao,Li Liu,Jinshan Hu,Wenquan Cui 대한화학회 2014 Bulletin of the Korean Chemical Society Vol.35 No.4

        Cd1-xZnxS-sensitized K4Nb6O17 composite photocatalysts (designated Cd1-xZnxS/K4Nb6O17) were prepared via a simple deposition-precipitation method. The samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), energy dispersive X-ray spectrometry (EDS), N2 sorption, ultraviolet–visible light diffuse reflectance spectroscopy (UV–Vis DRS), photoluminescence measurements (PL), and X-ray photoelectron spectroscopy (XPS). The Cd0.8Zn0.2S particles were scattered on the surface of K4Nb6O17, and had a relatively uniform size distribution around 50 nm. The absorption edge of K4Nb6O17 was shifted to the visible light region and the recombination of photo-generated electrons and holes suppressed after Cd0.8Zn0.2S loading. The Cd0.8Zn0.2S(25 wt %)/K4Nb6O17 composite possessed the highest photocatalytic activity for hydrogen production under visible light irradiation, evolving 8.278 mmol/g in 3 h. Recyclability tests were performed, and the composite photocatalysts were found to be fairly stable. The mechanism of charge separation between the photogenerated electrons and holes at the Cd0.8Zn0.2S/K4Nb6O17 composite was discussed.

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