摘要
Visible-light-active Fe-POMs was fabricated via precipitating Fe^3+with Keggin type polyoxometalates(H:PWi0a.H4SiWi204o or HsPMorOao)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^-l)was ca.2.5 and 1.8 times that by FePW and FeSiw.respectively.FTIR spectra indicated that the Keguin structure of PMoOag was maintained inFePMo.Mechanism study indicated that the photogenerated electrons in LUMO and the holes in HOMO were thermo-dynamically feasible for Cr(VI)reduction and H20 oxidation,respectively.Using FePMo as an optimized photocatalyst.good stability was also observed after 5 cvclic runs in both photocatalvtic performance and XRD structure.
基金
Supported by the National Natural Science Foundation of China(No.21876154)
the Natural Science Foundation of Zhejiang Province,China(No.LR18B070001)
partially supported by the Robert A.Welch Foundation(No.B-0027)(SM)
the Research-ers Supporting Project(No.RSP-2020/79)at Kine Saud University(AN).
