Details
| Original language | English |
|---|---|
| Article number | 130083 |
| Journal | Chemosphere |
| Volume | 275 |
| Early online date | 24 Feb 2021 |
| Publication status | Published - Jul 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.
Keywords
- BiTiO, CaTiO, Heterojunction, NO removal, Oxygen vacancy, Photocatalysis
ASJC Scopus subject areas
- Environmental Science(all)
- Environmental Engineering
- Chemistry(all)
- Environmental Science(all)
- Environmental Chemistry
- Environmental Science(all)
- Pollution
- Medicine(all)
- Public Health, Environmental and Occupational Health
- Environmental Science(all)
- Health, Toxicology and Mutagenesis
Sustainable Development Goals
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In: Chemosphere, Vol. 275, 130083, 07.2021.
Research output: Contribution to journal › Article › Research › peer review
}
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.
KW - BiTiO
KW - CaTiO
KW - Heterojunction
KW - NO removal
KW - Oxygen vacancy
KW - Photocatalysis
UR - http://www.scopus.com/inward/record.url?scp=85101777924&partnerID=8YFLogxK
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
M1 - 130083
ER -