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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
发表期刊Applied Catalysis B: Environmental
卷号239页码:1-9
文章类型期刊论文
摘要

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.

关键词Oxygen Vacancies Fe Substituted Srtio3 Photocatalysis Nitric Oxide In-situ Drifts
DOI10.1016/j.apcatb.2018.07.076
收录类别SCI
语种英语
引用统计
文献类型期刊论文
条目标识符http://ir.ieecas.cn/handle/361006/9562
专题粉尘与环境研究室
通讯作者Huang, Y (Huang, Yu)[ 2 ]; Cao, JJ (Cao, Jun-ji)[ 2 ]
作者单位1.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
推荐引用方式
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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