Journal
CHEMICAL ENGINEERING JOURNAL
Volume 439, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2022.135787
Keywords
Bi-piezoelectric effect; Water flow vibration; Integrated piezoelectric field; Dual-sustainable energy; Porous structure
Categories
Funding
- National Natural Science of China [11734005, 61704024, 61821002, 62075041]
- National Key Research and Development Program of China [2017YFA0700503, 2018YFA0209101]
- Fundamental Research Funds for the Central Universities [2242021k10009]
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In this study, a bi-piezoelectric ZnO nanorods (NR)/PVDF-HFP spongy film was proposed to enhance the photocatalytic degradation of organic dye using water flow vibration, and the contribution of the bi-piezoelectric effect to photocatalytic water decontamination was demonstrated through experiments.
Piezoelectric field engineering has been recently proved to restrain the photogenerated carrier recombination both in the bulk and on the surface of photocatalyst. Herein, we proposed a bi-piezoelectric ZnO nanorods (NR)/ PVDF-HFP spongy film that can utilize water flow vibration to boost the photocatalytic degradation of organic dye. The composite photocatalyst can be deformed by water flow to generate an integrated piezoelectric field from PVDF-HFP and ZnO NR, which can considerably drive the separation and transfer of photogenerated charge carriers in ZnO NR. As a result, the ZnO NR/PVDF-HFP spongy film shows a ~ 3 fold increase in reaction rate constant of degrading methyl orange (MO) with irradiation as flow speed increases from 200 rpm to 1000 rpm. A model about the bi-piezoelectric effect of ZnO NR/PVDF-HFP was configurated according to a series of characterization by piezoelectric force microscopy (PFM) and photoluminescence (PL). This work demonstrates the contribution of the bi-piezoelectric effect to photocatalytic water decontamination and provides a promising strategy to use dual-sustainable energy- solar and water energy.
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