Visible light-driven novel Bi2Ti2O7/CaTiO3 composite photocatalyst with enhanced photocatalytic activity towards NO removal

Publikation: Beitrag in FachzeitschriftArtikelForschungPeer-Review

Autoren

  • Menglin Shi
  • Baker Rhimi
  • Ke Zhang
  • Jingkun Xu
  • Detlef W. Bahnemann
  • Chuanyi Wang

Organisationseinheiten

Externe Organisationen

  • Shaanxi University of Science and Technology
  • Jiangxi Science and Technology Normal University
  • Staatliche Universität Sankt Petersburg
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Details

OriginalspracheEnglisch
Aufsatznummer130083
FachzeitschriftChemosphere
Jahrgang275
Frühes Online-Datum24 Feb. 2021
PublikationsstatusVeröffentlicht - Juli 2021

Abstract

Photocatalysis is regarded as a promising technology for removal of nitrogen oxide (NO), however, the low photocatalytic efficiencies under visible light irradiation and the deactivation of the photocatalyst are as yet the significant issues that should be addressed. In this work, visible-light-driven Bi2Ti2O7/CaTiO3 heterojunction composites were synthesized by a facile in-situ hydrothermal method. The Bi2Ti2O7/CaTiO3 composites displayed superior visible light photocatalytic activity than pure CaTiO3 and pure Bi2Ti2O7 in the removal of NO at the 600 ppb level in air. Among all the composites, Bi2Ti2O7/CaTiO3 containing 20 wt% Bi2Ti2O7 exhibited the best photocatalytic activity, achieving a maximum removal efficiency of 59%. The improved photocatalytic performance is mainly attributed to the strong visible-light-absorbing ability, the presence of an appropriate density of oxygen vacancy defects and the formation of heterojunction between CaTiO3 and Bi2Ti2O7, resulting in an efficient charge separation at the interface as proven by photoluminescence (PL) and photo-induced current measurements. According to trapping experiments and spin-trapping ESR analysis, the O2 and h+ are the principal reactive species involved in the photocatalytic NO removal. In addition, the as-obtained Bi2Ti2O7/CaTiO3 composite showed good chemical stability, which is beneficial for practical applications in air pollution removal.

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Visible light-driven novel Bi2Ti2O7/CaTiO3 composite photocatalyst with enhanced photocatalytic activity towards NO removal. / Shi, Menglin; Rhimi, Baker; Zhang, Ke et al.
in: Chemosphere, Jahrgang 275, 130083, 07.2021.

Publikation: Beitrag in FachzeitschriftArtikelForschungPeer-Review

Shi M, Rhimi B, Zhang K, Xu J, Bahnemann DW, Wang C. Visible light-driven novel Bi2Ti2O7/CaTiO3 composite photocatalyst with enhanced photocatalytic activity towards NO removal. Chemosphere. 2021 Jul;275:130083. Epub 2021 Feb 24. doi: 10.1016/j.chemosphere.2021.130083
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title = "Visible light-driven novel Bi2Ti2O7/CaTiO3 composite photocatalyst with enhanced photocatalytic activity towards NO removal",
abstract = "Photocatalysis is regarded as a promising technology for removal of nitrogen oxide (NO), however, the low photocatalytic efficiencies under visible light irradiation and the deactivation of the photocatalyst are as yet the significant issues that should be addressed. In this work, visible-light-driven Bi2Ti2O7/CaTiO3 heterojunction composites were synthesized by a facile in-situ hydrothermal method. The Bi2Ti2O7/CaTiO3 composites displayed superior visible light photocatalytic activity than pure CaTiO3 and pure Bi2Ti2O7 in the removal of NO at the 600 ppb level in air. Among all the composites, Bi2Ti2O7/CaTiO3 containing 20 wt% Bi2Ti2O7 exhibited the best photocatalytic activity, achieving a maximum removal efficiency of 59%. The improved photocatalytic performance is mainly attributed to the strong visible-light-absorbing ability, the presence of an appropriate density of oxygen vacancy defects and the formation of heterojunction between CaTiO3 and Bi2Ti2O7, resulting in an efficient charge separation at the interface as proven by photoluminescence (PL) and photo-induced current measurements. According to trapping experiments and spin-trapping ESR analysis, the •O2− and h+ are the principal reactive species involved in the photocatalytic NO removal. In addition, the as-obtained Bi2Ti2O7/CaTiO3 composite showed good chemical stability, which is beneficial for practical applications in air pollution removal.",
keywords = "BiTiO, CaTiO, Heterojunction, NO removal, Oxygen vacancy, Photocatalysis",
author = "Menglin Shi and Baker Rhimi and Ke Zhang and Jingkun Xu and Bahnemann, {Detlef W.} and Chuanyi Wang",
note = "Funding Information: This work was supported by the National Natural Science Foundation of China (21976116), Shaanxi Science and Technology Program (2020KWZ-005), SAFEA of China (High-end Foreign Expert Project), and Alexander-von-Humboldt Foundation of Germany (Group-Linkage Program). Menglin Shi : Performing the experiments; Writing the initial draft, Baker Rhimi : Ideas; Supervision; Evolution of overarching research goals and aims. Detlef W. Bahnemann : Acquisition of the financial support for the project leading to this publication. Ke Zhang : Data/evidence collection. Jingkun Xu : Visualization, Investigation Chuanyi Wang : Coordination responsibility for the research activity planning and execution. ",
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issn = "0045-6535",
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TY - JOUR

T1 - Visible light-driven novel Bi2Ti2O7/CaTiO3 composite photocatalyst with enhanced photocatalytic activity towards NO removal

AU - Shi, Menglin

AU - Rhimi, Baker

AU - Zhang, Ke

AU - Xu, Jingkun

AU - Bahnemann, Detlef W.

AU - Wang, Chuanyi

N1 - Funding Information: This work was supported by the National Natural Science Foundation of China (21976116), Shaanxi Science and Technology Program (2020KWZ-005), SAFEA of China (High-end Foreign Expert Project), and Alexander-von-Humboldt Foundation of Germany (Group-Linkage Program). Menglin Shi : Performing the experiments; Writing the initial draft, Baker Rhimi : Ideas; Supervision; Evolution of overarching research goals and aims. Detlef W. Bahnemann : Acquisition of the financial support for the project leading to this publication. Ke Zhang : Data/evidence collection. Jingkun Xu : Visualization, Investigation Chuanyi Wang : Coordination responsibility for the research activity planning and execution.

PY - 2021/7

Y1 - 2021/7

N2 - Photocatalysis is regarded as a promising technology for removal of nitrogen oxide (NO), however, the low photocatalytic efficiencies under visible light irradiation and the deactivation of the photocatalyst are as yet the significant issues that should be addressed. In this work, visible-light-driven Bi2Ti2O7/CaTiO3 heterojunction composites were synthesized by a facile in-situ hydrothermal method. The Bi2Ti2O7/CaTiO3 composites displayed superior visible light photocatalytic activity than pure CaTiO3 and pure Bi2Ti2O7 in the removal of NO at the 600 ppb level in air. Among all the composites, Bi2Ti2O7/CaTiO3 containing 20 wt% Bi2Ti2O7 exhibited the best photocatalytic activity, achieving a maximum removal efficiency of 59%. The improved photocatalytic performance is mainly attributed to the strong visible-light-absorbing ability, the presence of an appropriate density of oxygen vacancy defects and the formation of heterojunction between CaTiO3 and Bi2Ti2O7, resulting in an efficient charge separation at the interface as proven by photoluminescence (PL) and photo-induced current measurements. According to trapping experiments and spin-trapping ESR analysis, the •O2− and h+ are the principal reactive species involved in the photocatalytic NO removal. In addition, the as-obtained Bi2Ti2O7/CaTiO3 composite showed good chemical stability, which is beneficial for practical applications in air pollution removal.

AB - Photocatalysis is regarded as a promising technology for removal of nitrogen oxide (NO), however, the low photocatalytic efficiencies under visible light irradiation and the deactivation of the photocatalyst are as yet the significant issues that should be addressed. In this work, visible-light-driven Bi2Ti2O7/CaTiO3 heterojunction composites were synthesized by a facile in-situ hydrothermal method. The Bi2Ti2O7/CaTiO3 composites displayed superior visible light photocatalytic activity than pure CaTiO3 and pure Bi2Ti2O7 in the removal of NO at the 600 ppb level in air. Among all the composites, Bi2Ti2O7/CaTiO3 containing 20 wt% Bi2Ti2O7 exhibited the best photocatalytic activity, achieving a maximum removal efficiency of 59%. The improved photocatalytic performance is mainly attributed to the strong visible-light-absorbing ability, the presence of an appropriate density of oxygen vacancy defects and the formation of heterojunction between CaTiO3 and Bi2Ti2O7, resulting in an efficient charge separation at the interface as proven by photoluminescence (PL) and photo-induced current measurements. According to trapping experiments and spin-trapping ESR analysis, the •O2− and h+ are the principal reactive species involved in the photocatalytic NO removal. In addition, the as-obtained Bi2Ti2O7/CaTiO3 composite showed good chemical stability, which is beneficial for practical applications in air pollution removal.

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KW - CaTiO

KW - Heterojunction

KW - NO removal

KW - Oxygen vacancy

KW - Photocatalysis

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U2 - 10.1016/j.chemosphere.2021.130083

DO - 10.1016/j.chemosphere.2021.130083

M3 - Article

C2 - 33662727

AN - SCOPUS:85101777924

VL - 275

JO - Chemosphere

JF - Chemosphere

SN - 0045-6535

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