Chinese Journal of Catalysis ›› 2022, Vol. 43 ›› Issue (3): 771-781.DOI: 10.1016/S1872-2067(21)63843-3

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

Yingnan Zhaoa,b,, Xing Qina,, Xinyu Zhaob, Xin Wangb, Huaqiao Tana,b,*(), Huiying Sunb, Gang Yanc,&(), Haiwei Lid, Wingkei Hoa,#(), Shun-cheng Leed   

  1. aDepartment of Science and Environmental Studies, The Education University of Hong Kong, Hong Kong, China
    bKey Laboratory of Polyoxometalate and Reticular Material Chemistry of Ministry of Education, Faculty of Chemistry, Northeast Normal University, Changchun 130024, Jilin, China
    cCollege of Material Science and Engineering, Jilin Jianzhu University, Changchun 130018, Jilin, China
    dDepartment of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hong Kong, China
  • Received:2021-03-15 Revised:2021-03-15 Online:2022-03-18 Published:2022-02-18
  • Contact: Huaqiao Tan, Gang Yan, Wingkei Ho
  • About author:Wing Kei HO obtained his BS and PhD in the Chinese University of Hong Kong. He works as a postdoctoral fellow in the Department of Civil & Environmental Engineering, the Hong Kong Polytechnic University and the Department of Mechanical & Materials Engineering, the University of Western Ontario, Canada. He is currently a professor at the Education University of Hong Kong and an associate head of SES. He is also an adjunct professor of Xi'an Jiaotong University, P.R. China and Institute of Earth Environment, Chinese Academy of Sciences, P.R. China. His primary research interest is heterogeneous catalysis and photocatalysis for energy conversion and environmental remediation. He Joined the editorial board of Chin. J. Catal. In 2020.
    First author contact:

    These authors contributed equally.

  • Supported by:
    National Natural Science Foundation of China(21771033);Fundamental Research Funds for the Central Universities(2412018BJ001);“HongKong Scholar” programme(2018–2019);“HongKong Scholar” programme(XJ2018021);General Research Fund, Research Grants Council of Hong Kong Government(18301117);Dean’s Research Fund, EdUHK(04425)

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.

Key words: Bismuth-based photocatalyst, Polyoxometalates, Bi, Photocatalytic degradation, NO removal