Cargando…

Photocatalytic reduction of Cr(VI) by WO(3)@PVP with elevated conduction band level and improved charge carrier separation property

Photocatalytic reduction of heavy metal ions is a green and promising technology which requires electrons with enough negative energy levels as well as efficient separation property from photo-generated holes of photocatalysts. For WO(3), the low conduction band edge and the severe photo-generated c...

Descripción completa

Detalles Bibliográficos
Autores principales: Li, Houfen, Xue, Shuai, Cao, Yajie, Yue, Xiuping, Zhang, Aiming, Chen, Chao
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Elsevier 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9488075/
https://www.ncbi.nlm.nih.gov/pubmed/36159607
http://dx.doi.org/10.1016/j.ese.2020.100034
_version_ 1784792580821614592
author Li, Houfen
Xue, Shuai
Cao, Yajie
Yue, Xiuping
Zhang, Aiming
Chen, Chao
author_facet Li, Houfen
Xue, Shuai
Cao, Yajie
Yue, Xiuping
Zhang, Aiming
Chen, Chao
author_sort Li, Houfen
collection PubMed
description Photocatalytic reduction of heavy metal ions is a green and promising technology which requires electrons with enough negative energy levels as well as efficient separation property from photo-generated holes of photocatalysts. For WO(3), the low conduction band edge and the severe photo-generated charge carrier recombination limited its application in photocatalytic reduction of pollutants. In this work, we prepared WO(3)@PVP with PVP capped WO(3) by a simple one-step hydrothermal method, which showed an elevated energy band structure and improved charge carrier separation property. XRD, SEM, TEM, XPS, DRS, and the photocurrent density test were carried out to study the properties of the composite. Results demonstrated monoclinic WO(3) with a size of ∼100–250 nm capped by PVP was obtained, which possessed fewer lattice defects inside but more defects (W(5+)) on the surface. Moreover, the results of the photocatalytic experiment showed the kinetic constant of Cr(VI) reduction process on WO(3)@PVP was 0.532 h(−1), which was 3.1 times higher than that on WO(3) (0.174 h(−1)), demonstrating WO(3)@PVP with good photocatalytic capability for Cr(VI) reduction. This can be attributed to the improved charge carrier separation performance, the improved adsorption capacity and the elevated conduction band edge of WO(3)@PVP. More importantly, the energy band structure of WO(3)@PVP was proved elevated with a value as high as 1.14 eV than that of WO(3) nanoparticles, which enables WO(3)@PVP a promising material in the photocatalytic reduction reaction of heavy metal ions from wastewater.
format Online
Article
Text
id pubmed-9488075
institution National Center for Biotechnology Information
language English
publishDate 2020
publisher Elsevier
record_format MEDLINE/PubMed
spelling pubmed-94880752022-09-23 Photocatalytic reduction of Cr(VI) by WO(3)@PVP with elevated conduction band level and improved charge carrier separation property Li, Houfen Xue, Shuai Cao, Yajie Yue, Xiuping Zhang, Aiming Chen, Chao Environ Sci Ecotechnol Original Research Photocatalytic reduction of heavy metal ions is a green and promising technology which requires electrons with enough negative energy levels as well as efficient separation property from photo-generated holes of photocatalysts. For WO(3), the low conduction band edge and the severe photo-generated charge carrier recombination limited its application in photocatalytic reduction of pollutants. In this work, we prepared WO(3)@PVP with PVP capped WO(3) by a simple one-step hydrothermal method, which showed an elevated energy band structure and improved charge carrier separation property. XRD, SEM, TEM, XPS, DRS, and the photocurrent density test were carried out to study the properties of the composite. Results demonstrated monoclinic WO(3) with a size of ∼100–250 nm capped by PVP was obtained, which possessed fewer lattice defects inside but more defects (W(5+)) on the surface. Moreover, the results of the photocatalytic experiment showed the kinetic constant of Cr(VI) reduction process on WO(3)@PVP was 0.532 h(−1), which was 3.1 times higher than that on WO(3) (0.174 h(−1)), demonstrating WO(3)@PVP with good photocatalytic capability for Cr(VI) reduction. This can be attributed to the improved charge carrier separation performance, the improved adsorption capacity and the elevated conduction band edge of WO(3)@PVP. More importantly, the energy band structure of WO(3)@PVP was proved elevated with a value as high as 1.14 eV than that of WO(3) nanoparticles, which enables WO(3)@PVP a promising material in the photocatalytic reduction reaction of heavy metal ions from wastewater. Elsevier 2020-05-08 /pmc/articles/PMC9488075/ /pubmed/36159607 http://dx.doi.org/10.1016/j.ese.2020.100034 Text en © 2020 The Author(s) https://creativecommons.org/licenses/by-nc-nd/4.0/This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
spellingShingle Original Research
Li, Houfen
Xue, Shuai
Cao, Yajie
Yue, Xiuping
Zhang, Aiming
Chen, Chao
Photocatalytic reduction of Cr(VI) by WO(3)@PVP with elevated conduction band level and improved charge carrier separation property
title Photocatalytic reduction of Cr(VI) by WO(3)@PVP with elevated conduction band level and improved charge carrier separation property
title_full Photocatalytic reduction of Cr(VI) by WO(3)@PVP with elevated conduction band level and improved charge carrier separation property
title_fullStr Photocatalytic reduction of Cr(VI) by WO(3)@PVP with elevated conduction band level and improved charge carrier separation property
title_full_unstemmed Photocatalytic reduction of Cr(VI) by WO(3)@PVP with elevated conduction band level and improved charge carrier separation property
title_short Photocatalytic reduction of Cr(VI) by WO(3)@PVP with elevated conduction band level and improved charge carrier separation property
title_sort photocatalytic reduction of cr(vi) by wo(3)@pvp with elevated conduction band level and improved charge carrier separation property
topic Original Research
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9488075/
https://www.ncbi.nlm.nih.gov/pubmed/36159607
http://dx.doi.org/10.1016/j.ese.2020.100034
work_keys_str_mv AT lihoufen photocatalyticreductionofcrvibywo3pvpwithelevatedconductionbandlevelandimprovedchargecarrierseparationproperty
AT xueshuai photocatalyticreductionofcrvibywo3pvpwithelevatedconductionbandlevelandimprovedchargecarrierseparationproperty
AT caoyajie photocatalyticreductionofcrvibywo3pvpwithelevatedconductionbandlevelandimprovedchargecarrierseparationproperty
AT yuexiuping photocatalyticreductionofcrvibywo3pvpwithelevatedconductionbandlevelandimprovedchargecarrierseparationproperty
AT zhangaiming photocatalyticreductionofcrvibywo3pvpwithelevatedconductionbandlevelandimprovedchargecarrierseparationproperty
AT chenchao photocatalyticreductionofcrvibywo3pvpwithelevatedconductionbandlevelandimprovedchargecarrierseparationproperty