Plasmonic Bi/ZnWO4Microspheres with Improved Photocatalytic Activity on NO Removal under Visible Light

Yunxia Gao, Yu Huang, Yan Li, Qian Zhang, Jun ji Cao, Wingkei Ho, Shuncheng Lee

Research output: Journal article publicationJournal articleAcademic researchpeer-review

75 Citations (Scopus)

Abstract

In this work, bismuth (Bi) nanoparticle anchored ZnWO4microspheres (Bi/ZnWO4) were prepared and used as robust and efficient photocatalysts for NO removal at parts-per-billion level under visible light irradiation. The as-synthesized composite with a proper mass ratio of Bi (50%) displayed a higher reaction rate (0.067 min-1) than its single counterparts ZnWO4(0.004 min-1) and Bi (0.027 min-1), respectively. Due to the surface plasmon resonance (SPR) effect of Bi nanoparticles, the Bi/ZnWO4composites showed broad light absorption in the visible spectrum. Moreover, the formation of the Bi/ZnWO4heterointerface promoted the separation of photoexcited electron-hole pairs, which is demonstrated by the increased photocurrent density in comparison to the pristine materials. The above characteristics endowed the Bi/ZnWO4composites with superior photocatalytic activity for NO removal. The radical scavanger tests revealed that the superoxide radical was the main active species to initiate NO oxidation, while the hydroxyl radical was not involved in the process. This study shows practical value in air pollutant abatement, because it provides an economical and feasible route to fabricate SPR-enhanced composite photocatalysts using earth abundant Bi material instead of noble metals.
Original languageEnglish
Pages (from-to)6912-6920
Number of pages9
JournalACS Sustainable Chemistry and Engineering
Volume4
Issue number12
DOIs
Publication statusPublished - 5 Dec 2016

Keywords

  • Bi/ZnWO nanocomposites 4
  • Intermediates
  • NO removal
  • Photocatalysis
  • Surface plasmon resonance effect (SPR)

ASJC Scopus subject areas

  • Chemistry(all)
  • Environmental Chemistry
  • Chemical Engineering(all)
  • Renewable Energy, Sustainability and the Environment

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