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Fabrication of Fe-POMs as Visible-light-active Heterogeneous Photocatalyst

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Abstract

Visible-light-active Fe-POMs was fabricated via precipitating Fe3+ with Keggin type polyoxometalates (H3PW12O40, H4SiW12O40 or H3PMo12O40) under solvothermal condition. The as-prepared Fe-POMs were denoted as FePW, FeSiW and FePMo, respectively. Among the three kinds of Fe-POMs, FePMo displayed the highest visible light absorption, the largest specific surface area, the most sensitive photocurrent response and the smallest charge transfer resistance, which were all beneficial for heterogeneous photocatalysis. The efficiency for Cr(VI) reduction was ca. 88% by FePMo after 50 min visible light irradiation. The estimated rate constant(0.042 min−1) was ca. 2.5 and 1.8 times that by FePW and FeSiW, respectively. FTIR spectra indicated that the Keggin structure of PMo12O403− was maintained in FePMo. Mechanism study indicated that the photogenerated electrons in LUMO and the holes in HOMO were thermodynamically feasible for Cr(VI) reduction and H2O oxidation, respectively. Using FePMo as an optimized photocatalyst, good stability was also observed after 5 cyclic runs in both photocatalytic performance and XRD structure.

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Authors and Affiliations

  1. School of Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou, 310018, P. R. China

    Qing Cen, Wei Xiao, Yingqi Liu & Qi Wang

  2. Department of Chemistry, University of North Texas, Denton, TX, 76201, USA

    Shengqian Ma

  3. Department of Chemistry, College of Science, King Saud University, Riyadh, 11451, Saudi Arabia

    Ayman Nafady

Authors
  1. Qing Cen
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  2. Wei Xiao
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  3. Yingqi Liu
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  4. Qi Wang
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  5. Ayman Nafady
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  6. Shengqian Ma
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Corresponding authors

Correspondence to Qi Wang or Shengqian Ma.

Additional information

Supported by the National Natural Science Foundation of China(No.21876154), the Zhejiang Provincial Natural Science Foundation, China(No.LR18B070001), and partially supported by the Robert A. Welch Foundation(No.B-0027)(SM) and the Researchers Supporting Project(No.RSP-2020/7a) at King Saud University(AN).

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Cen, Q., Xiao, W., Liu, Y. et al. Fabrication of Fe-POMs as Visible-light-active Heterogeneous Photocatalyst. Chem. Res. Chin. Univ. 36, 1128–1135 (2020). https://doi.org/10.1007/s40242-020-0320-y

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  • DOI: https://doi.org/10.1007/s40242-020-0320-y

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