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The BiFeO3/g-C3N4 heterostructure, which is fabricated via a simple mixing-calcining method, benefits the significant enhancement of the pyrocatalytic performance. With the growth of g-C3N4 content in the heterostructure pyrocatalysts from 0 to 25%, the decomposition ratio of Rhodamine B (RhB) dye after 18 cold-hot temperature fluctuation (25-65 ℃) cycles increases at first and then decreases, reaching a maximum value of ~94.2% at 10% while that of the pure BiFeO3 is ~67.7%. The enhanced dye decomposition may be due to the generation of the internal electric field which strengthens the separation of the positive and negative carriers and further accelerates their migrations. The intermediate products in the pyrocatalytic reaction also have been detected and confirmed, which proves the key role of the pyroelectric effect in realizing the dye decomposition using BiFeO3/g-C3N4 heterostructure catalyst. The pyroelectric BiFeO3/g-C3N4 heterostructure shows the potential application in pyrocatalytically degrading dye wastewater.


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Enhanced pyrocatalysis of the pyroelectric BiFeO3/g-C3N4 heterostructure for dye decomposition driven by cold-hot temperature alternation

Show Author's information Mingzi CHENa,bYanmin JIAa,b( )Huamei LIaZheng WUc( )Tianyin HUANGdHongfang ZHANGd( )
College of Physics and Electronic Information Engineering, Zhejiang Normal University, Jinhua 321004, China
School of Science, Xi'an University of Posts and Telecommunications, Xi'an 710121, China
College of Environmental and Chemical Engineering, Xi'an Polytechnic University, Xi'an 710048, China
Jiangsu Key Laboratory of Micro and Nano Heat Fluid Flow Technology and Energy Application, School of Physical Science and Technology and School of Environmental Science and Engineering, Suzhou University of Science and Technology, Suzhou 215009, China

Abstract

The BiFeO3/g-C3N4 heterostructure, which is fabricated via a simple mixing-calcining method, benefits the significant enhancement of the pyrocatalytic performance. With the growth of g-C3N4 content in the heterostructure pyrocatalysts from 0 to 25%, the decomposition ratio of Rhodamine B (RhB) dye after 18 cold-hot temperature fluctuation (25-65 ℃) cycles increases at first and then decreases, reaching a maximum value of ~94.2% at 10% while that of the pure BiFeO3 is ~67.7%. The enhanced dye decomposition may be due to the generation of the internal electric field which strengthens the separation of the positive and negative carriers and further accelerates their migrations. The intermediate products in the pyrocatalytic reaction also have been detected and confirmed, which proves the key role of the pyroelectric effect in realizing the dye decomposition using BiFeO3/g-C3N4 heterostructure catalyst. The pyroelectric BiFeO3/g-C3N4 heterostructure shows the potential application in pyrocatalytically degrading dye wastewater.

Keywords:

pyroelectric material, BiFeO3, g-C3N4, heterostructure, pyrocatalysis
Received: 14 August 2020 Revised: 13 November 2020 Accepted: 05 December 2020 Published: 05 February 2021 Issue date: April 2021
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Publication history
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Publication history

Received: 14 August 2020
Revised: 13 November 2020
Accepted: 05 December 2020
Published: 05 February 2021
Issue date: April 2021

Copyright

© The Author(s) 2020

Acknowledgements

This work was supported by the National Natural Science Foundation of China (Nos. 51872264 and 51778391), Shaanxi Provincial National Science Foundation of China (No. 2020JM-579), Key Research and Development Program of Shaanxi Province, China (No. 2020GXLH-Z-032), and the Basic Public Welfare Research Program of Zhejiang Province, China (No. LGG18E020005).

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