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Simultaneously employing light and vibration energy by piezoelectric material to realize environmental remediation is an advanced oxidation method. Silver niobate (AgNbO3) is a visible light driven photocatalyst for the removal of organic pollutants. However, the high recombination rate of photo-generated electrons and holes suppresses its photocatalytic activity. Piezoelectric potential excited by vibration can facilitate the separation of light induced charges. Unfortunately, AgNbO3 is an antiferroelectric. In this work, distinct photo-/vibration-bi-catalysis has been achieved in ferroelectric (1−x)AgNbO3xLiTaO3 solid solution. The results show that ~96% Rhodamine B (RhB) can be decomposed under the bi-excitation of ultrasound and visible light within 120 min with 0.95AgNbO3–0.05LiTaO3 catalyst. The synergy effect from efficient visible light excitation and enhanced separation of the photo-induced charges from the electric field by the mechanical strain results in the distinct decomposition performance of catalysts.


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High efficiently harvesting visible light and vibration energy in (1−x)AgNbO3xLiTaO3 solid solution around antiferroelectric–ferroelectric phase boundary for dye degradation

Show Author's information Tufeng HEaZhenzhu CAOa( )Guorong LIbYanmin JIAc( )Biaolin PENGd( )
College of Chemical Engineering, Inner Mongolia University of Technology, Hohhot 010051, China
Key Laboratory of Inorganic Function Material and Device, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China
School of Science, Xi’an University of Posts & Telecommunications, Xi’an 710121, China
School of Advanced Materials and Nanotechnology, Xidian University, Xi’an 710126, China

Abstract

Simultaneously employing light and vibration energy by piezoelectric material to realize environmental remediation is an advanced oxidation method. Silver niobate (AgNbO3) is a visible light driven photocatalyst for the removal of organic pollutants. However, the high recombination rate of photo-generated electrons and holes suppresses its photocatalytic activity. Piezoelectric potential excited by vibration can facilitate the separation of light induced charges. Unfortunately, AgNbO3 is an antiferroelectric. In this work, distinct photo-/vibration-bi-catalysis has been achieved in ferroelectric (1−x)AgNbO3xLiTaO3 solid solution. The results show that ~96% Rhodamine B (RhB) can be decomposed under the bi-excitation of ultrasound and visible light within 120 min with 0.95AgNbO3–0.05LiTaO3 catalyst. The synergy effect from efficient visible light excitation and enhanced separation of the photo-induced charges from the electric field by the mechanical strain results in the distinct decomposition performance of catalysts.

Keywords: photocatalysis, decomposition, visible light, piezoelectric effect

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Publication history

Received: 06 April 2022
Revised: 26 July 2022
Accepted: 28 July 2022
Published: 11 October 2022
Issue date: October 2022

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© The Author(s) 2022.

Acknowledgements

This study was supported by the National Natural Science Foundation of China (Nos. 51562029 and 21762031), Program for Grassland Elite of Inner Mongolia Autonomous Region (No. CYYC10032), and Program for Innovative Research Team in Universities of Inner Mongolia Autonomous Region (No. NMGIRT2214).

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