Journal
CATALYSIS TODAY
Volume 340, Issue -, Pages 121-127Publisher
ELSEVIER
DOI: 10.1016/j.cattod.2018.09.010
Keywords
ZnO nanorod arrays; Ag nanoparticles; Au clusters; Heavy metal pollutants
Funding
- National Natural Science Foundation of China [U1463204, 21173045, 21872029, 21802020]
- Award Program for Minjiang Scholar Professorship
- Natural Science Foundation of Fujian Province [2017J07002]
- Independent Research Project of State Key Laboratory of Photocatalysis on Energy and Environment [2014A05]
- first Program of Fujian Province for Top Creative Young Talents
- Program for Returned High-Level Overseas Chinese Scholars of Fujian province
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The design and optimization of semiconductor-metal/metal cluster heterostructures are highly desirable for efficient photocatalytic redox reactions. Herein, Ag-tipped ZnO nanorod arrays decorated with glutathione-protected Au clusters (ZnO-Ag-Au NRAs) have been successfully prepared via photodeposition method and electrostatic self-assembly method, in which Ag nanoparticles are demonstrated to act as an electron mediator and Au clusters serve as a visible light photosensitizer to generate additional charge carriers in the composite photocatalyst. With selective tip growth of metallic Ag and surface decoration of Au clusters on ZnO NRAs, the as-obtained ZnO-Ag-Au NRAs operate to boost the charge separation and transfer, thereby showing the enhanced photocatalytic reduction of aqueous heavy metal ions. This work affords a feasible paradigm for the fine construction of tipped one-dimensional-based hybrid photocatalysts with enhanced activity toward the elimination of heavy metal pollutants from aqueous solutions.
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