Enhanced Photocatalytic Degradation Performance by Fluid-Induced Piezoelectric Field

  • Yawei Feng
    Yawei Feng
    Education Ministry Key and International Joint Lab of Resource Chemistry and Shanghai Key Lab of Rare Earth Functional Materials, Shanghai Normal University, Shanghai 200234, People’s Republic of China
    More by Yawei Feng
  • Hao Li
    Hao Li
    Education Ministry Key and International Joint Lab of Resource Chemistry and Shanghai Key Lab of Rare Earth Functional Materials, Shanghai Normal University, Shanghai 200234, People’s Republic of China
    More by Hao Li
  • Lili Ling
    Lili Ling
    Education Ministry Key and International Joint Lab of Resource Chemistry and Shanghai Key Lab of Rare Earth Functional Materials, Shanghai Normal University, Shanghai 200234, People’s Republic of China
    More by Lili Ling
  • Sa Yan
    Sa Yan
    Education Ministry Key and International Joint Lab of Resource Chemistry and Shanghai Key Lab of Rare Earth Functional Materials, Shanghai Normal University, Shanghai 200234, People’s Republic of China
    More by Sa Yan
  • Donglai Pan
    Donglai Pan
    Education Ministry Key and International Joint Lab of Resource Chemistry and Shanghai Key Lab of Rare Earth Functional Materials, Shanghai Normal University, Shanghai 200234, People’s Republic of China
    More by Donglai Pan
  • Hao Ge
    Hao Ge
    Education Ministry Key and International Joint Lab of Resource Chemistry and Shanghai Key Lab of Rare Earth Functional Materials, Shanghai Normal University, Shanghai 200234, People’s Republic of China
    More by Hao Ge
  • Hexing Li*
    Hexing Li
    Education Ministry Key and International Joint Lab of Resource Chemistry and Shanghai Key Lab of Rare Earth Functional Materials, Shanghai Normal University, Shanghai 200234, People’s Republic of China
    *H. Li. E-mail: [email protected]
    More by Hexing Li
  • , and 
  • Zhenfeng Bian*
    Zhenfeng Bian
    Education Ministry Key and International Joint Lab of Resource Chemistry and Shanghai Key Lab of Rare Earth Functional Materials, Shanghai Normal University, Shanghai 200234, People’s Republic of China
    *Z. Bian. E-mail: [email protected]
Cite this: Environ. Sci. Technol. 2018, 52, 14, 7842–7848
Publication Date (Web):June 21, 2018
https://doi.org/10.1021/acs.est.8b00946
Copyright © 2018 American Chemical Society
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Abstract

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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The Supporting Information is available free of charge on the ACS Publications website at DOI: 10.1021/acs.est.8b00946.

  • SEM, TEM images and SAED patterns of PZT; SEM images, XRD patterns, absorption spectra, XPS spectra, N2 adsorption–desorption isotherms of PZT/TiO2 samples; SEM images, TEM images, XRD patterns, absorption spectra, N2 adsorption–desorption isotherms of SiO2/TiO2 samples; Emission spectra of high-pressure mercury lamp and UV LED; RhB degradation performance on PZT/TiO2 and the physical mixture; photocurrent output from TiO2electrode; absorption spectra and TOC content of RhB solution, BPA solution; recycling tests (PDF)

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