Monoclinic dibismuth tetraoxide: A new visible-light-driven photocatalyst for environmental remediation
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AbstractA new visible-light-driven photocatalyst, monoclinic dibismuth tetraoxide (m-Bi2O4), has been discovered. This simple oxide with mixed valent states (Bi3+ and Bi5+) has a band gap energy of 2.0 eV, and is responsive to wavelength up to 620 nm. The first-principle calculations within the hybrid density functional framework (HSE) indicate that m-Bi2O4 is a typical indirect-gap semiconductor. It shows much higher photocatalytic degradation activity as well as photostability than some of the well-investigated highly efficient photocatalysts, such as CdS and Bi2O3. Not only typical dyes and colorless aromatic compounds, including rhodamine B, methyl orange, methyl blue, phenol and 4-nitrophenol, but also bacterial (Escherichia coli) cells can be effectively degraded/inactivated in the presence of m-Bi2O4. The electronic potential of band structure is studied and a photocatalytic mechanism is also proposed, in which both (OH)-O-center dot and direct h(+) oxidation play important roles in the degradation process. Our discovery highlights the potential of developing Bi2O4-based photocatalysts as a new class of highly active, stable and safe photocatalyst for versatile pollutant degradation and disinfection under visible light. (C) 2015 Published by Elsevier B.V.
All Author(s) ListWang WJ, Chen XQ, Liu G, Shen ZR, Xia DH, Wong PK, Yu JC
Journal nameApplied Catalysis B: Environmental
Volume Number176
Pages444 - 453
LanguagesEnglish-United Kingdom
KeywordsBacterial disinfection; Bismuth oxide; Photocatalysis; Pollutant degradation
Web of Science Subject CategoriesChemistry; Chemistry, Physical; Engineering; Engineering, Chemical; Engineering, Environmental

Last updated on 2020-11-08 at 02:40