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Hierarchical p-n heterostructure BiOI@ZnTi-LDH for Cr(VI) reduction under visible light.
- Source :
-
Journal of Alloys & Compounds . Aug2020, Vol. 833, pN.PAG-N.PAG. 1p. - Publication Year :
- 2020
-
Abstract
- 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 visible-light 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 (λ > 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. Image 1 • Hierarchical BiOI@ZnTi-LDH core-shell material with p-n heterostructure was prepared using a simple hydrothermal method. • ZnTi-LDH nanoplatelets were coated on the BiOI core to form the BiOI@ZnTi-LDH microspheres with unique 3D structure. • The enhanced photoreduction performances were to the formation of p-n heterojunction and unique 3D structure. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 09258388
- Volume :
- 833
- Database :
- Academic Search Index
- Journal :
- Journal of Alloys & Compounds
- Publication Type :
- Academic Journal
- Accession number :
- 143119347
- Full Text :
- https://doi.org/10.1016/j.jallcom.2020.154898