Type II heterojunction in hierarchically porous zinc oxide/graphitic carbon nitride microspheres promoting photocatalytic activity

Sijia Wu, Hong Juan Zhao, Chao Fan Li, Jing Liu, Wenda Dong, Heng Zhao, Chao Wang, Yang Liu, Zhi Yi Hu, Lihua Chen, Yu Li, Bao Lian Su

Résultats de recherche: Contribution à un journal/une revueArticle

Résumé

Graphitic carbon nitride (g-C3N4) is a visible light active semiconductor. However, low conductivity and high recombination rate of photogenerated electrons and holes limit its application in photocatalysis. In this work, we design and synthesize hierarchically porous zinc oxide/graphitic carbon nitride (ZnO/g-C3N4) microspheres with type-II heterojunction to effectively degrade rhodamine B (RhB) via increasing the charge-separation efficiency. The ultraviolet-visible (UV–Vis) absorption spectra, Mott-Schottky plots and valence band X-ray photoelectron spectroscope confirm the formation of type-II heterojunction between ZnO nanocrystals and g-C3N4 nanosheets. As a result, the 1.5-ZnO/g-C3N4 composite (the mass ratio of zinc acetate dihydrate to g-C3N4 is 1.5) exhibits the highest photocatalytic activity with good stability and higher photocatalytic degradation rate comparing to pure g-C3N4 and pure ZnO. In addition, our results confirm that [rad]O2 and h+ are the main active species for ZnO/g-C3N4 in degradation of RhB.

langue originaleAnglais
Pages (de - à)99-107
Nombre de pages9
journalJournal of Colloid and Interface Science
Volume538
Les DOIs
étatPublié - 7 mars 2019

Empreinte digitale

rhodamine B
Zinc Oxide
Carbon nitride
Zinc oxide
Microspheres
Heterojunctions
Zinc Acetate
Degradation
Photocatalysis
Nanosheets
Photoelectrons
Valence bands
Nanocrystals
Absorption spectra
Zinc
Semiconductor materials
X rays
Electrons
Composite materials
cyanogen

Citer ceci

@article{051dc4a8fce340ad80e6ee5d12d96ca6,
title = "Type II heterojunction in hierarchically porous zinc oxide/graphitic carbon nitride microspheres promoting photocatalytic activity",
abstract = "Graphitic carbon nitride (g-C3N4) is a visible light active semiconductor. However, low conductivity and high recombination rate of photogenerated electrons and holes limit its application in photocatalysis. In this work, we design and synthesize hierarchically porous zinc oxide/graphitic carbon nitride (ZnO/g-C3N4) microspheres with type-II heterojunction to effectively degrade rhodamine B (RhB) via increasing the charge-separation efficiency. The ultraviolet-visible (UV–Vis) absorption spectra, Mott-Schottky plots and valence band X-ray photoelectron spectroscope confirm the formation of type-II heterojunction between ZnO nanocrystals and g-C3N4 nanosheets. As a result, the 1.5-ZnO/g-C3N4 composite (the mass ratio of zinc acetate dihydrate to g-C3N4 is 1.5) exhibits the highest photocatalytic activity with good stability and higher photocatalytic degradation rate comparing to pure g-C3N4 and pure ZnO. In addition, our results confirm that [rad]O2 − and h+ are the main active species for ZnO/g-C3N4 in degradation of RhB.",
keywords = "Active species, Heterojunction, Hierarchically porous structure, Photocatalytic activity, ZnO/g-CN",
author = "Sijia Wu and Zhao, {Hong Juan} and Li, {Chao Fan} and Jing Liu and Wenda Dong and Heng Zhao and Chao Wang and Yang Liu and Hu, {Zhi Yi} and Lihua Chen and Yu Li and Su, {Bao Lian}",
note = "Copyright {\circledC} 2018 Elsevier Inc. All rights reserved.",
year = "2019",
month = "3",
day = "7",
doi = "10.1016/j.jcis.2018.11.076",
language = "English",
volume = "538",
pages = "99--107",
journal = "Journal of Colloid and Interface Science",
issn = "0021-9797",
publisher = "Academic Press Inc.",

}

Type II heterojunction in hierarchically porous zinc oxide/graphitic carbon nitride microspheres promoting photocatalytic activity. / Wu, Sijia; Zhao, Hong Juan; Li, Chao Fan; Liu, Jing; Dong, Wenda; Zhao, Heng; Wang, Chao; Liu, Yang; Hu, Zhi Yi; Chen, Lihua; Li, Yu; Su, Bao Lian.

Dans: Journal of Colloid and Interface Science, Vol 538, 07.03.2019, p. 99-107.

Résultats de recherche: Contribution à un journal/une revueArticle

TY - JOUR

T1 - Type II heterojunction in hierarchically porous zinc oxide/graphitic carbon nitride microspheres promoting photocatalytic activity

AU - Wu, Sijia

AU - Zhao, Hong Juan

AU - Li, Chao Fan

AU - Liu, Jing

AU - Dong, Wenda

AU - Zhao, Heng

AU - Wang, Chao

AU - Liu, Yang

AU - Hu, Zhi Yi

AU - Chen, Lihua

AU - Li, Yu

AU - Su, Bao Lian

N1 - Copyright © 2018 Elsevier Inc. All rights reserved.

PY - 2019/3/7

Y1 - 2019/3/7

N2 - Graphitic carbon nitride (g-C3N4) is a visible light active semiconductor. However, low conductivity and high recombination rate of photogenerated electrons and holes limit its application in photocatalysis. In this work, we design and synthesize hierarchically porous zinc oxide/graphitic carbon nitride (ZnO/g-C3N4) microspheres with type-II heterojunction to effectively degrade rhodamine B (RhB) via increasing the charge-separation efficiency. The ultraviolet-visible (UV–Vis) absorption spectra, Mott-Schottky plots and valence band X-ray photoelectron spectroscope confirm the formation of type-II heterojunction between ZnO nanocrystals and g-C3N4 nanosheets. As a result, the 1.5-ZnO/g-C3N4 composite (the mass ratio of zinc acetate dihydrate to g-C3N4 is 1.5) exhibits the highest photocatalytic activity with good stability and higher photocatalytic degradation rate comparing to pure g-C3N4 and pure ZnO. In addition, our results confirm that [rad]O2 − and h+ are the main active species for ZnO/g-C3N4 in degradation of RhB.

AB - Graphitic carbon nitride (g-C3N4) is a visible light active semiconductor. However, low conductivity and high recombination rate of photogenerated electrons and holes limit its application in photocatalysis. In this work, we design and synthesize hierarchically porous zinc oxide/graphitic carbon nitride (ZnO/g-C3N4) microspheres with type-II heterojunction to effectively degrade rhodamine B (RhB) via increasing the charge-separation efficiency. The ultraviolet-visible (UV–Vis) absorption spectra, Mott-Schottky plots and valence band X-ray photoelectron spectroscope confirm the formation of type-II heterojunction between ZnO nanocrystals and g-C3N4 nanosheets. As a result, the 1.5-ZnO/g-C3N4 composite (the mass ratio of zinc acetate dihydrate to g-C3N4 is 1.5) exhibits the highest photocatalytic activity with good stability and higher photocatalytic degradation rate comparing to pure g-C3N4 and pure ZnO. In addition, our results confirm that [rad]O2 − and h+ are the main active species for ZnO/g-C3N4 in degradation of RhB.

KW - Active species

KW - Heterojunction

KW - Hierarchically porous structure

KW - Photocatalytic activity

KW - ZnO/g-CN

UR - http://www.scopus.com/inward/record.url?scp=85057159859&partnerID=8YFLogxK

U2 - 10.1016/j.jcis.2018.11.076

DO - 10.1016/j.jcis.2018.11.076

M3 - Article

C2 - 30500471

AN - SCOPUS:85057159859

VL - 538

SP - 99

EP - 107

JO - Journal of Colloid and Interface Science

JF - Journal of Colloid and Interface Science

SN - 0021-9797

ER -