4.8 Article

Synthesis of One-Dimensional CdS@TiO2 Core-Shell Nanocomposites Photocatalyst for Selective Redox: The Dual Role of TiO2 Shell

期刊

ACS APPLIED MATERIALS & INTERFACES
卷 4, 期 11, 页码 6378-6385

出版社

AMER CHEMICAL SOC
DOI: 10.1021/am302074p

关键词

one-dimensional; core-shell nanocomposite; visible-light photocatalyst; selective oxidation; mild conditions

资金

  1. National Natural Science Foundation of China [20903022, 20903023, 21173045]
  2. Award Program for Minjiang Scholar Professorship
  3. Natural Science Foundation of Fujian Province for Distinguished Young Investigator Grant [2012J06003]
  4. Program for Changjiang Scholars and Innovative Research Team in Universities [PCSIRT0818]
  5. Program for Returned High-Level Overseas Chinese Scholars of Fujian province
  6. Scientific Research Foundation for the Returned Overseas Chinese Scholars, State Education Ministry

向作者/读者索取更多资源

One-dimensional (1D) CdS@TiO2 core-shell nanocomposites (CSNs) have been successfully synthesized via a two-step solvothermal method. The structure and properties of ID CdS@TiO2 core-shell nanocomposites (CdS@TiO2 CSNs) have been characterized by a series of techniques, including X-ray diffraction (XRD), ultraviolet-visible-light (UV-vis) diffuse reflectance spectra (DRS), field-emission scanning electron microscopy (FESEM), photoluminescence spectra (PL), and electron spin resonance (ESR) spectroscopy. The results demonstrate that ID core-shell structure is formed by coating TiO2 onto the substrate of CdS nanowires (NWs). The visible-light-driven photocatalytic activities of the as-prepared ID CdS@TiO2 CSNs are evaluated by selective oxidation of alcohols to aldehydes under mild conditions. Compared to bare CdS NWs, an obvious enhancement of both conversion and yield is achieved over 1D CdS@TiO2 CSNs, which is ascribed to the prolonged lifetime of photogenerated charge carriers over 1D CdS@TiO2 CSNs under visible-light irradiation. Furthermore, it is disclosed that the photogenerated holes from CdS core can be stuck by the TiO2 shell, as evidenced by controlled radical scavenger experiments and efficiently selective reduction of heavy-metal ions, Cr(VI), over ID CdS@TiO2 CSNs, which consequently leads to the fact that the reaction mechanism of photocatalytic oxidation of alcohols over 1D CdS@TiO2 CSNs is apparently different from that over 1D CdS NWs under visible-light irradiation. It is hoped that our work could not only offer useful information on the fabrication of various specific 1D core-shell nanostructures, but also open a new doorway of such 1D core-shell semiconductors as visible-light photocatalysts in the promising field of selective transformations.

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