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Synthesis of SrFexTi1-xO3-delta nanocubes with tunable oxygen vacancies for selective and efficient photocatalytic NO oxidation
Zhang, Q (Zhang, Qian)[ 1 ]; Huang, Y (Huang, Yu)[ 2 ]; Peng, SQ (Peng, Shiqi)[ 1 ]; Huang, TT (Huang, Tingting)[ 1 ]; Cao, JJ (Cao, Jun-ji)[ 2 ]; Ho, WK (Ho, Wingkei)[ 3 ]; Lee, S (Lee, Shuncheng)[ 4 ]
2018-10-30
Source PublicationApplied Catalysis B: Environmental
Volume239Pages:1-9
Subtype期刊论文
Abstract

Oxygen vacancies of metal oxides play critical roles in tunning activity and selectivity for many photocatalysis mediated reactions, yet the mechanism of NO oxidation on defect enriched photocatalyst surface is seldomly discussed. Herein, we provide detailed insight into the relationship between oxygen vacancy manipulation by extrinsic Fe3+ substitution in SrTiO3 host lattice and the photocatalytic performance of NO abatement. In particular, the hydrothermal synthesized SrFexTi1-xO3-δ nanocubes (denoted as SFTO-hyd sample) rather than the impregnated-post annealing sample, enabled oxygen vacancy formation, and promoted O2 adsorption and superoxide anion radicals (O2−) formation. The SFTO-hyd (x = 5%) sample showed remarkably higher NO removal activity and selectivity under Xe lamp (λ > 420 nm), in comparison with the pristine SrTiO3, P25 and impregnation-doped SFTO sample, underlining the important roles played by coexisted Fe3+ sites and oxygen vacancies. The in situ diffuse reflectance IR spectroscopy (DRIFTS) mechanically revealed that SrTiO3 provided Lewis acidic sites for NO dark adsorption and photoreaction with nitrates as final products; the substitutional Fe3+ sites provided more active sites for NO adsorption and photoreaction with enhanced number of radicals. This study deepens the understanding of photocatalytic NO abatement on defective surface, and may also provide a simple and cost effective strategy for synthesizing efficient and selective photocatalysts for environmental remediation.

KeywordOxygen Vacancies Fe Substituted Srtio3 Photocatalysis Nitric Oxide In-situ Drifts
DOI10.1016/j.apcatb.2018.07.076
Indexed BySCI
Language英语
Citation statistics
Cited Times:2[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.ieecas.cn/handle/361006/9562
Collection粉尘与环境研究室
Corresponding AuthorHuang, Y (Huang, Yu)[ 2 ]; Cao, JJ (Cao, Jun-ji)[ 2 ]
Affiliation1.Key Laboratory of Aerosol Chemistry and Physics, Institute of Earth Environment, Chinese Academy of Sciences, Xi’an, 710061, China;
2.State Key Lab of Loess and Quaternary Geology (SKLLQG), Institute of Earth Environment, Chinese Academy of Sciences, Xi’an, 710061, China;
3.Department of Science and Environmental Studies, The Hong Kong Institute of Education, Hong Kong, China;
4.Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hong Kong, China
Recommended Citation
GB/T 7714
Zhang, Q ,Huang, Y ,Peng, SQ ,et al. Synthesis of SrFexTi1-xO3-delta nanocubes with tunable oxygen vacancies for selective and efficient photocatalytic NO oxidation[J]. Applied Catalysis B: Environmental,2018,239:1-9.
APA Zhang, Q .,Huang, Y .,Peng, SQ .,Huang, TT .,Cao, JJ .,...&Lee, S .(2018).Synthesis of SrFexTi1-xO3-delta nanocubes with tunable oxygen vacancies for selective and efficient photocatalytic NO oxidation.Applied Catalysis B: Environmental,239,1-9.
MLA Zhang, Q ,et al."Synthesis of SrFexTi1-xO3-delta nanocubes with tunable oxygen vacancies for selective and efficient photocatalytic NO oxidation".Applied Catalysis B: Environmental 239(2018):1-9.
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