Polyoxometalates-doped Bi2O3–x/Bi photocatalyst for highly efficient visible-light photodegradation of tetrabromobisphenol A and removal of NO

Yingnan Zhao, Xing Qin, Xinyu Zhao, Xin Wang, Huaqiao Tan, Huiying Sun, Gang Yan, Haiwei Li, Wingkei Ho, Shun cheng Lee

Research output: Journal article publicationJournal articleAcademic researchpeer-review

20 Citations (Scopus)

Abstract

Bismuth-based photocatalysts are a class of excellent visible-light photocatalysts; however, their redox activity is relatively poor and the efficiency of photogenerated carrier separation is low, limiting their development and application in the field of photocatalysis. To address these issues, a series of polyoxometalate PW12O403–-doped Bi2O3–x/Bi Schottky photocatalysts PW12@Bi2O3–x/Bi-n (PBOB-n, where n is the amount of NaBH4, i.e., 6, 12, 18, 24, and 48 mg) were prepared by a simple electrospinning/calcination/in-situ NaBH4 reduction method. In this composite photocatalyst, the doping of PW12 could effectively adjust the electronic structure of Bi2O3–x and improve its redox properties. As a shallow electron trap, PW12 promoted the separation of the photogenerated carriers. Furthermore, desirable Schottky junction between the metal Bi nanoparticles and PW12@Bi2O3–x further accelerated the separation of the photogenerated carriers. The synergistic effect of the aforementioned factors endowed PBOB-n with excellent photocatalytic activity. Among the samples, PBOB-18 exhibited superior photocatalytic activity. Under visible-light irradiation, 93.7% (20 mg catalyst) of 20 ppm tetrabromobisphenol A (TBBPA, 20 mL) was degraded in 60 min. Its activity was 4.4 times higher than that of Bi2O3. PBOB-18 also exhibited an ultrahigh photocatalytic performance for the removal of NO. Its removal rate (600 ppb) reached 83.3% in 30 min, making it one of the most active Bi-based photocatalysts. Furthermore, the photocatalytic mechanisms of PBOB-18 for TBBPA and NO have been proposed. This work provides a new direction and reference for the design of low-cost, efficient, stable, and versatile photocatalysts.

Original languageEnglish
Pages (from-to)771-781
Number of pages11
JournalChinese Journal of Catalysis
Volume43
Issue number3
DOIs
Publication statusPublished - Mar 2022

Keywords

  • Bi
  • Bismuth-based photocatalyst
  • NO removal
  • Photocatalytic degradation
  • Polyoxometalates

ASJC Scopus subject areas

  • Catalysis
  • General Chemistry

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