TY - JOUR
T1 - Microemulsion synthesis of ms/tz-BiVO4 composites
T2 - The effect of pH on crystal structure and photocatalytic performance
AU - Cao, Xinqiang
AU - Gu, Yan
AU - Tian, Hailin
AU - Fang, Yanfen
AU - Johnson, David
AU - Ren, Zhiyong
AU - Chen, Chuncheng
AU - Huang, Yingping
N1 - Funding Information:
This work was supported by the National Natural Science Foundation of China (Nos. 21677086 , 21972073 , 21577078 ), Hubei province introduces foreign talents and intelligence projects (No. 2019BJH004 ), China Postdoctoral Science Foundation (No. 2018M640721 ), Postdoctoral Science Foundation of Hubei province (No. G83 ) and Three Gorges University Master's Thesis Training Fund (No. 2019SSPY154 ).
Publisher Copyright:
© 2020 Elsevier Ltd and Techna Group S.r.l.
PY - 2020/9
Y1 - 2020/9
N2 - In this work, BiVO4 composites, containing the tetragonal zircon phase (tz-BiVO4), and monoclinic scheelite phase (ms-BiVO4), 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-BiVO4 composite forms at pH = 1.0 and pure ms-BiVO4 is obtained in the pH range 4.0–10.0. The three primary steps in preparing BiVO4 were monitored by optical microscopy and the role played by the microemulsion on the phase composition of BiVO4 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 BiVO4 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 (O2•−) and photogenerated holes (h+).
AB - In this work, BiVO4 composites, containing the tetragonal zircon phase (tz-BiVO4), and monoclinic scheelite phase (ms-BiVO4), 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-BiVO4 composite forms at pH = 1.0 and pure ms-BiVO4 is obtained in the pH range 4.0–10.0. The three primary steps in preparing BiVO4 were monitored by optical microscopy and the role played by the microemulsion on the phase composition of BiVO4 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 BiVO4 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 (O2•−) and photogenerated holes (h+).
KW - Effect of pH on phase composition
KW - Hole-electron recombination
KW - Microcystin-LR
KW - Microemulsion synthesis
KW - ms/tz-BiVO composites
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U2 - 10.1016/j.ceramint.2020.05.048
DO - 10.1016/j.ceramint.2020.05.048
M3 - Article
AN - SCOPUS:85084794077
SN - 0272-8842
VL - 46
SP - 20788
EP - 20797
JO - Ceramics International
JF - Ceramics International
IS - 13
ER -