Journal
APPLIED CATALYSIS B-ENVIRONMENTAL
Volume 284, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apcatb.2020.119730
Keywords
Bi-.333(Bi6S9)Br/Bi2S3 heterostructure; Direct Z-scheme mechanism; Cr (VI) photoreduction; Defects
Funding
- National Program on Key Research Project [2016YFC0400504]
- National Science Foundation of China [52072326, 21701138]
- Doctoral Innovation Project of Xinjiang University [XJUBSCX-2017008]
- Autonomous Region Graduate Research Innovation Project [XJ2019G016]
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By introducing sulfur defects and a direct Z-scheme heterostructure, the Bi-.(333)(Bi6S9)Br/Bi2S3 hybrid nanorods exhibited excellent photocatalytic performance, providing a new strategy for the design of advanced photocatalytic materials.
The design of a direct Z-scheme system heterostructure that can achieve an effective charge separation is highly desirable for photocatalysis. Herein, Bi-.(333)(Bi6S9)Br/Bi2S3 heterostructure nanorods were synthesized by a facile hydrothermal method, and the photocatalytic reduction of Cr (VI) under visible light irradiation was conducted to evaluate their photocatalytic performance. Sulfur defects were introduced into the Bi-.(333)(Bi6S9)Br/Bi2S3 hybrid nanorods in a controlled way during the phase evolution. Microstructural analysis shows that the interface of Bi-.(333)(Bi6S9)Br/Bi2S3 heterostructure consists of (130) facet of Bi-.(333)(Bi6S9)Br and (300) facet of Bi2S3. The high performance of the Bi-.( )333(Bi6S9)Br/Bi2S3 hybrid nanorods was ascribed to sulfur defects and direct Z-scheme heterostructure. The sulfur defects can effectively adsorb and activate Cr (VI) while a direct Z-scheme mechanism between Bi-.(333) (Bi6S9)Br and Bi2S3 significantly improved the separation and transfer efficiency of photogenerated electrons and holes. This work provides a new strategy for the design of advanced photocatalytic materials.
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