Tuning electron transfer by crystal facet engineering of BiVO4 for boosting visible-light driven photocatalytic reduction of bromate
| Autor: | Yaoliang Shen, Han Wang, Peng Wu, Qun Yan, Yasmina Doekhi-Bennani, Yukun Zhu, Guoshuai Liu |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Environmental Engineering
Materials science 010504 meteorology & atmospheric sciences Crystal engineering 010501 environmental sciences Bromate Photochemistry 01 natural sciences Pollution Electron transfer chemistry.chemical_compound chemistry Bismuth vanadate Photocatalysis Environmental Chemistry Water treatment Waste Management and Disposal Single crystal 0105 earth and related environmental sciences Monoclinic crystal system Visible spectrum |
| Zdroj: | Science of the Total Environment, 762 |
| ISSN: | 0048-9697 |
| Popis: | Removal of bromate (BrO3−) has gained increasing attention in drinking water treatment process. Photocatalysis technology is an effective strategy for bromate removal. During the photocatalytic reduction of bromate process, the photo-generated electrons are reductive species toward bromate reduction and photo-generated holes responsible for water oxidation. In this study, the monoclinic bismuth vanadate (BiVO4) single crystal was developed as a visible photocatalyst for the effective removal of bromate. The as-synthesized BiVO4 photocatalyst with optimized {010} and {110} facets ratio could achieve almost 100% removal efficiency of BrO3− driven by visible light with a first-order kinetic constant of 0.0368 min−1. As demonstrated by the electron scavenger experiment and density functional theory (DFT) calculations, the exposed facets of BiVO4 should account for the high photocatalytic reduction efficiency. Under visible light illumination, the photo-generated electron and holes were spatially transferred to {010} facets and {110} facets, respectively. The BiVO4 single crystal photocatalyst may serve as an attractive photocatalyst by virtue of its response to the visible light, spatially charge transfer and separation as well as high photocatalytic activity, which will make the removal of BrO3− in water much easier, more economical and more sustainable. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect