Full spectrum light driven photocatalytic in-situ epitaxy of one-unit-cell Bi2O2CO3 layers on Bi2O4 nanocrystals for highly efficient photocatalysis and mechanism unveiling

Li, Jun; Wu, Xiaoyong; Wan, Zhen; Chen, Hong; Zhang, Gaoke

doi:10.1016/j.apcatb.2018.10.067

Title: Full spectrum light driven photocatalytic in-situ epitaxy of one-unit-cell Bi₂O₂CO₃ layers on Bi₂O₄ nanocrystals for highly efficient photocatalysis and mechanism unveiling

Journal Article · Sat Oct 27 00:00:00 EDT 2018 · Applied Catalysis B: Environmental

DOI:https://doi.org/10.1016/j.apcatb.2018.10.067· OSTI ID:1490959

Li, Jun ^[1];

^[1]; Wan, Zhen ^[1]; Chen, Hong ^[2]; Zhang, Gaoke ^[1]

Wuhan Univ. of Technology, Wuhan (China)
SLAC National Accelerator Lab., Menlo Park, CA (United States)

In-situ epitaxial growth is a fascinating strategy to nicely couple two low dimensional semiconductors as highly efficient composite photocatalysts. Meanwhile, organic contaminants in the photocatalytic process are usually decomposed into greenhouse gas (CO₂) that can’t be reused. Herein, we reported a green full spectrum light (UV, visible and NIR lights) induced epitaxial growth strategy to synthesize highly efficient Bi₂O₄/Bi₂O₂CO₃ heterostructure photocatalyst by reusing waste carbon source, in which one-unit-cell Bi₂O₂CO₃ layers (1.0 nm) in-situ grew on the surface of Bi₂O₄ nanocrystals during the photocatalytic degradation of rhodamine B (RhB) or phenol. More importantly, ¹³C nuclear magnetic resonance (NMR) spectroscopy confirmed that the carbon element in Bi₂O₂CO₃ was from the photocatalytic degradation of organic contaminations. Furthermore, density functional theory (DFT) calculations confirm that the Bi₂O₄ nanocrystals with exposed {-101} facets have the larger percentage of undercoordinated Bi atoms, which provided favorable conditions for the in-situ epitaxy of Bi₂O₂CO₃ during the photocatalytic reaction. Additionally, the increased charge density near the Fermi level resulted in improved photoresponsivity of Bi₂O₄/Bi₂O₂CO₃ composite and the coalescence of Bi₂O₄ and Bi₂O₂CO₃ could favor the travel of photogenerated carriers from one to another owing to the close work functions for Bi₂O₄ (4.295 eV) and Bi₂O₂CO₃ (4.410 eV). As we expected, the Bi₂O₄/Bi₂O₂CO₃ composite presented higher photocatalytic activity for phenol and ciprofloxacin (CIP) degradation than pure Bi₂O₄ nanocrystals. The possible degradation pathway of CIP in aqueous solution and photocatalytic mechanism of Bi₂O₄/Bi₂O₂CO₃ composite were also proposed based on liquid chromatography mass spectrometer (LC–MS) analysis and experimental results. Furthermore, this work provides a green strategy for designing highly efficient photocatalysts.

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Research Organization:: SLAC National Accelerator Lab., Menlo Park, CA (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: 51472194; 2013CB632402; 2016CFA078

OSTI ID:: 1490959

Journal Information:: Applied Catalysis B: Environmental, Vol. 243, Issue C; ISSN 0926-3373

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 91 works

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37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
Full spectrum light
Epitaxy
One-unit-cell Bi2O2CO3 layers
Bi2O4 nanocrystals
NMR observation
DFT study

Title: Full spectrum light driven photocatalytic in-situ epitaxy of one-unit-cell Bi2O2CO3 layers on Bi2O4 nanocrystals for highly efficient photocatalysis and mechanism unveiling

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