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Construction of Bi 2 Fe 4 O 9 /red phosphorus heterojunction for rapid and efficient photo‐reduction of Cr(VI)
Author(s) -
Zhu Enquan,
Zhao Shuxian,
Du Hong,
Ma Yuhua,
Qi Kezhen,
Guo Cangchen,
Su Zhi,
Wang Xin,
Wu Zhende,
Wang Zhuanhu
Publication year - 2021
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.17782
Subject(s) - heterojunction , photocatalysis , x ray photoelectron spectroscopy , materials science , charge carrier , semiconductor , hydrothermal circulation , schottky barrier , diffuse reflectance infrared fourier transform , nanoparticle , optoelectronics , chemical engineering , nanotechnology , catalysis , chemistry , diode , biochemistry , engineering
Construction of heterojunctions with matching energy band structures between two semiconductors displays great potential in promoting the separation and transfer of photogenerated charge carriers and is one of the effective strategies for obtaining high active photocatalysts. In this study, a type‐II heterojunction photocatalyst was designed and prepared using Bi 2 Fe 4 O 9 (BFO) nanoparticles and hydrothermal‐treated red phosphorus (HRP). The photocatalytic performance test exhibited that the 3%BFO/HRP composite photocatalyst with 3% mass fraction of BFO rapidly and efficiently photoreduced Cr(VI), and the reduction was completed within 25 min, with a rate constant of 0.15 min −1 , which was 15 times higher than that of pure HRP. Further mechanistic investigation revealed that the photocatalytic activity was enhanced due to the tight heterojunction between BFO and HRP, thereby effectively promoting carrier transfer, destroying the carrier recombination, and reducing the charge‐transfer resistance of composite catalyst. Mott–Schottky diagrams and UV‐vis diffuse reflectance spectroscopy data indicated the theoretical feasibility of establishing a close contact between BFO and HRP. X‐ray photoelectron spectroscopy provided evidence for the way in which interfacial charges were transferred. This work provides a new possibility to construct heterojunction photocatalysts for the rapid and efficient reduction of Cr(VI).