Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 408, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.jhazmat.2020.124897
Keywords
Defects; Internal electric fields; Double Z-scheme; NO; Deep oxidation
Categories
Funding
- Project of the National Natural Science Foundation of China [51772180]
- Shaanxi Province Key Research and Development Plan [2018GY-107]
- Graduate Innovation Fund of Shaanxi University of Science and Technology [SUST-A04]
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The photocatalytic NO deep oxidation was enhanced by the synergistic effect of defects and internal electric fields in the g-C3N4-x/BiOCl/WO2.92 heterojunction, resulting in significantly increased NO removal rates. This study demonstrates the optimization of carrier dynamics in heterojunction photocatalysts for photocatalytic NO deep oxidation.
In this work, g-C3N4-x/BiOCl/WO2.92 heterojunction with N-O vacancies was prepared using NaBiO3 and WCl6 as raw materials and non-metal plasma of WO2.92 grew in-situ on the surface of BiOCl, resulting in the enhanced photocatalytic NO deep oxidation. XPS tests and DFT calculation indicated the formation of internal electric fields from g-C3N4-x to BiOCl, BiOCl to WO2.92, which induced the transition from II-II-type to double Z-scheme hetero-structure. High separation efficiency, prolong lifetime and strong redox ability of photo-generated electron-hole pairs were simultaneously achieved due to the charge capture effect of defects and double Z-scheme mechanism. Therefore, g-C3N4-x/BiOCl/WO2.92 exhibited the significantly increased NO removal rates from 21.17% (BiOCl/WO2.92) and 36.52% (g-C3N4-x) to 68.70% and the main oxidation product of NO was NO3-. This study revealed that the carrier dynamics of heterojunction photocatalysts could be optimized by the synergistic effect of defects and internal electric fields to achieve photocatalytic NO deep oxidization.
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