Ultrasound and water flow driven piezophototronic effect in self-polarized flexible alpha-Fe2O3 containing PVDF nanofibers film for enhanced catalytic oxidation

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216305%3A26220%2F21%3APU141834" target="_blank" >RIV/00216305:26220/21:PU141834 - isvavai.cz</a>

Výsledek na webu

<a href="https://www.sciencedirect.com/science/article/pii/S2211285521008387?dgcid=rss_sd_all" target="_blank" >https://www.sciencedirect.com/science/article/pii/S2211285521008387?dgcid=rss_sd_all</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.nanoen.2021.106586" target="_blank" >10.1016/j.nanoen.2021.106586</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Ultrasound and water flow driven piezophototronic effect in self-polarized flexible alpha-Fe2O3 containing PVDF nanofibers film for enhanced catalytic oxidation

Popis výsledku v původním jazyce

A new piezophotocatalytically active membrane based on polyvinylidene fluoride (PVDF) nanofibers with alpha-Fe2O3 nanoparticles incorporated into them has been synthesized by electrospinning. The composition, morphology and structure of alpha-Fe2O3 containing PVDF nanofibers mats were investigated by SEM, XRD, Raman, FTIR, XPS and DSC. Studies have shown that the inclusion of alpha-Fe2O3 nanoparticles promotes additional crystallization and self-polarization of PVDF into an electroactive beta-phase. With the help of XPS, the mechanism of interfacial ion-dipole electrostatic interaction, leading to self-polishing and crystallization of the structure, is shown. Using measurements of VB XPS, UPS and the frequency dependence of the dielectric constant, the role of polarization effects on the formation of long-lived metastable energy states in the electronic structure of PVDF near the Fermi level is shown. Piezocatalytic and piezophotocatalytic activity was assessed by the decomposition of Methylene Blue (MB) under the influence of ultrasound and UV-Vis radiation. The efficiency of piezocatalysis and piezophotocatalysis was 60.4% and 99.5%, respectively. With the help of experiments on the capture of active redox forms, it was found that center dot OH radicals are the main component of the MB degradation. Two different mechanisms of generating center dot OH radicals for piezocatalysis and piezophotocatalysis have been reasonably proposed. The stability of the catalyst was shown after five successive cycles of piezophotocatalysis.

Název v anglickém jazyce

Ultrasound and water flow driven piezophototronic effect in self-polarized flexible alpha-Fe2O3 containing PVDF nanofibers film for enhanced catalytic oxidation

Popis výsledku anglicky

A new piezophotocatalytically active membrane based on polyvinylidene fluoride (PVDF) nanofibers with alpha-Fe2O3 nanoparticles incorporated into them has been synthesized by electrospinning. The composition, morphology and structure of alpha-Fe2O3 containing PVDF nanofibers mats were investigated by SEM, XRD, Raman, FTIR, XPS and DSC. Studies have shown that the inclusion of alpha-Fe2O3 nanoparticles promotes additional crystallization and self-polarization of PVDF into an electroactive beta-phase. With the help of XPS, the mechanism of interfacial ion-dipole electrostatic interaction, leading to self-polishing and crystallization of the structure, is shown. Using measurements of VB XPS, UPS and the frequency dependence of the dielectric constant, the role of polarization effects on the formation of long-lived metastable energy states in the electronic structure of PVDF near the Fermi level is shown. Piezocatalytic and piezophotocatalytic activity was assessed by the decomposition of Methylene Blue (MB) under the influence of ultrasound and UV-Vis radiation. The efficiency of piezocatalysis and piezophotocatalysis was 60.4% and 99.5%, respectively. With the help of experiments on the capture of active redox forms, it was found that center dot OH radicals are the main component of the MB degradation. Two different mechanisms of generating center dot OH radicals for piezocatalysis and piezophotocatalysis have been reasonably proposed. The stability of the catalyst was shown after five successive cycles of piezophotocatalysis.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10403 - Physical chemistry

Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2021

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Nano Energy

ISSN

2211-2855

e-ISSN

2211-3282

Svazek periodika

90

Číslo periodika v rámci svazku

106586

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

13

Strana od-do

1-13

Kód UT WoS článku

000708838800001

EID výsledku v databázi Scopus

2-s2.0-85116918656