Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 833, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2020.154898
Keywords
BiOI; Zn/Ti hydrotalcites; P-N heterostructure; Cr(VI) photoreduction; Hierarchical core-shell structure
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Funding
- Key Research and Development Program of Hunan Province [2018SK20110]
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The hierarchically core-shell BiOI@Zn/Ti hydrotalcite (LDH) composites with p-n heterostructure was successfully prepared by layer-by-layer self-assembly using a facile hydrothermal method, where the ZnTi-LDH nanoplatelets were coated on the BiOI core to form the flower-like BiOI@ZnTi-LDH microspheres. The morphology, microstructure, surface properties, photoelectric performances and visiblelight response of the BiOI@ZnTi-LDH were also investigated in detail. Comparing to the single BiOI and ZnTi-LDH components, the p-n heterostructure BiOI@ZnTi-LDH indicated excellent enhanced photocatalytic activity for hexavalent chromium (Cr(VI)) reduction under visible-light irradiation (l > 420 nm), which was imputed to the efficient combination of the unique 3D hierarchical core-shell structure and p-n heterojunction endowing the photogenerated electronhole pairs with efficient transfer and separation abilities. At the same time, In virtue of spectroscopy, Mott-Schottky and photoelectric techniques, the formation of p-n heterostructure and the charge transfer between BiOI and ZnTi-LDH were determined. So, this work provided a promising approach for the design and construction of smart 3D hierarchical core-shell materials in environmental treatment. (c) 2020 Elsevier B.V. All rights reserved.
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