High efficiently harvesting visible light and vibration energy in (1−x)AgNbO3–xLiTaO3 solid solution around antiferroelectric–ferroelectric phase boundary for dye degradation
Tufeng He, Zhenzhu Cao, Guorong Li, Yanmin Jia, Biaolin Peng
Abstract
Abstract Simultaneously employing light and vibration energy by piezoelectric material to realize environmental remediation is an advanced oxidation method. Silver niobate (AgNbO 3 ) 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, AgNbO 3 is an antiferroelectric. In this work, distinct photo-/vibration-bi-catalysis has been achieved in ferroelectric (1− x )AgNbO 3 – x LiTaO 3 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 0.95AgNbO 3 –0.05LiTaO 3 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.