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Microemulsion synthesis of ms/tz-BiVO4 composites: The effect of pH on crystal structure and photocatalytic performance.
- Source :
-
Ceramics International . Sep2020, Vol. 46 Issue 13, p20788-20797. 10p. - Publication Year :
- 2020
-
Abstract
- In this work, BiVO 4 composites, containing the tetragonal zircon phase (tz -BiVO 4), and monoclinic scheelite phase (ms -BiVO 4), were synthesized using the microemulsion method. The effect of pH on phase composition and photocatalytic activity were investigated. Based on X-ray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM), a ms/tz -BiVO 4 composite forms at pH = 1.0 and pure ms -BiVO 4 is obtained in the pH range 4.0–10.0. The three primary steps in preparing BiVO 4 were monitored by optical microscopy and the role played by the microemulsion on the phase composition of BiVO 4 is explained. Photoluminescence spectroscopy (PL), UV–visible diffuse reflectance spectroscopy (UV-DRS), Brunauer-Emmett-Teller (BET), linear sweep voltammetry (LSV) and electrochemical impedance spectroscopy (EIS) were employed to characterize the physical and chemical properties of BiVO 4 composites. The composite formed at pH = 1 exhibited the lowest hole-electron (h + - e - ) recombination rate, resulting in the highest photocatalytic activity towards microcystin-LR (MC-LR), with near 100% removal of MC-LR in 5 h. ESR and trapping experiments indicated that MC-LR degradation was mediated primarily by hydroxyl radicals (•OH), superoxide radicals (O 2 •−) and photogenerated holes (h + ). [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 02728842
- Volume :
- 46
- Issue :
- 13
- Database :
- Academic Search Index
- Journal :
- Ceramics International
- Publication Type :
- Academic Journal
- Accession number :
- 144830706
- Full Text :
- https://doi.org/10.1016/j.ceramint.2020.05.048