Novel two-step synthesis method of thin film heterojunction of BiOBr/Bi2WO6 with improved visible-light-driven photocatalytic activity

Anna Pancielejko; Justyna Łuczak; Wojciech Lisowski; Adriana Zaleska-Medynska; Paweł Mazierski

doi:10.1016/j.apsusc.2021.151082

Novel two-step synthesis method of thin film heterojunction of BiOBr/Bi2WO6 with improved visible-light-driven photocatalytic activity

Abstract

A novel two-step ionic liquid assisted procedure was applied for a controllable synthesis of BiOBr/Bi2WO6 heterojunction thin films. The preparation route involved an anodic oxidation of tungsten foil and hydrothermal transformation of as-anodized oxide in the presence of bismuth precursor and ionic liquid, N-butylpyridinium bromide [BPy][Br]. The BiOBr plates with irregular shapes adhered to the surface of flower-like Bi2WO6 and formed a heterojunction between BiOBr and Bi2WO6, as confirmed by the analysis of their structure and composition. The highest efficiency of phenol degradation was achieved when the highest amount of IL was used (the apparent quantum efficiency was almost 8 and 71.5 times higher compared to BiOBr and Bi2WO6, respectively). In addition, superoxide radicals (•O2–) were found as the main factor responsible for the photodegradation. A possible reaction mechanism was further investigated as a function of monochromatic irradiation to determine the exact range of the composite photoactivity.

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Authors (5)

Anna Pancielejko
Justyna Łuczak dr hab. inż.
Wojciech Lisowski dr hab.
- Polska Akademia Nauk
Adriana Zaleska-Medynska prof. dr hab.
- Uniwersytet Gdański
Paweł Mazierski dr inż.
- Uniwersytet Gdański

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Articles

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artykuły w czasopismach

Published in:

APPLIED SURFACE SCIENCE no. 569,
ISSN: 0169-4332

Language:

English

Publication year:

2021

Bibliographic description:

Pancielejko A., Łuczak J., Lisowski W., Zaleska-Medynska A., Mazierski P.: Novel two-step synthesis method of thin film heterojunction of BiOBr/Bi2WO6 with improved visible-light-driven photocatalytic activity// APPLIED SURFACE SCIENCE -Vol. 569, (2021), s.151082-

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