Enhanced Photocatalytic Degradation Performance by Fluid-Induced Piezoelectric Field

The introduction of a piezoelectric field has been proven a promising method to enhance photocatalytic activity by preventing photoelectron–hole recombination. However, the formation of a piezoelectric field requires additional mechanical force or high-frequency ultrasonic baths, which limits its po...

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Published inEnvironmental science & technology Vol. 52; no. 14; pp. 7842 - 7848
Main Authors Feng, Yawei, Li, Hao, Ling, Lili, Yan, Sa, Pan, Donglai, Ge, Hao, Li, Hexing, Bian, Zhenfeng
Format Journal Article
LanguageEnglish
Published United States American Chemical Society 17.07.2018
Subjects
Catalysis
Catalysts
Catalytic activity
Chlorophenol
Electric fields
Electrons
Energy
Energy harvesting
Mineralization
p-Chlorophenol
Performance degradation
Phenols
Photocatalysis
Photodegradation
Photoelectric effect
Photoelectric emission
Photovoltaic cells
Piezoelectricity
Recombination
Titanium
Titanium dioxide
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Summary:The introduction of a piezoelectric field has been proven a promising method to enhance photocatalytic activity by preventing photoelectron–hole recombination. However, the formation of a piezoelectric field requires additional mechanical force or high-frequency ultrasonic baths, which limits its potential application on industrial scale. Therefore, it is of great practical significance to design the catalyst that can harvest the discrete energy such as the fluid mechanical energy to form the electric field. Herein, PZT/TiO2 catalyst with a core–shell configuration was prepared by a simple coating method. By collecting the mechanical energy of water, an internal piezoelectric field was induced. Under 800 rpm stirring, transient photocurrent measured on PZT/TiO2 electrode is about 1.7 times higher than that of 400 rpm. Correspondingly, the photocatalytic degradation rate and mineralization efficiency of RhB, BPA, phenol, p-chlorophenol much improved, showing the promoting effect of piezoelectric field generated directly from harvesting the discrete fluid mechanical energy.
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ISSN:0013-936X
1520-5851
DOI:10.1021/acs.est.8b00946