Piezoelectrically polarized electric field can provide a strong driving force for the separation of the photoinduced charge carriers that has attracted a wide attention in the field of photocatalysis. In this paper, a new type of piezoelectric borate material CsCdBO 3 exhibits a high efficiency for the degradation of typical organic pollutants under the synergistic effects of strain and light conditions. The oxidation rate constant of the synergistic effect is 0.653 min −1 , which is 3.77 times that of just under visible light irradiation. Further, the material shows a higher efficiency when treated both under the clockwise stirring direction and a high stirring speed. A characteristic piezoresponse hysteresis loop was detected using the piezoresponse force microscopy (PFM) approach. The strain-driven polarized electric field facilitates to promote the photoinduced electron−hole pair separation, thus enhancing the photocatalytic activity. The present work provides a new direction of the borate with a noncentrosymmetric structure in the environmental remediation.
Piezocatalysts have attracted considerable attention
due to their
ability to convert natural mechanical energy into chemical energy.
However, the inefficient chemical reactions of the free charges and
the poor mechanical endurance of the powder piezoelectric materials
have largely restricted their wide application. Here, by combining
piezocatalyst Cu3B2O6 (CBO) and polyvinylidene
fluoride (PVDF), a composite membrane CBO/PVDF with superior stability
and excellent piezo-performance is prepared for the first time. This
composite membrane shows a high efficiency for the degradation of
antibiotics and organic dyes under ultrasonication; particularly,
the removal efficiency is 33.9 times higher than that of a pure PVDF
membrane for amoxicillin degradation, and it maintains a high efficiency
after 16 cycling tests. The polarization electric field in the dual
piezoelectric composite membrane significantly enhances the redox
reaction of the intrinsic free carrier with dissolved oxygen and water
molecules to generate reactive oxygen species. The results provide
a strategy for combining the borate with the polymer membrane to lead
piezocatalysis to real future applications.
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