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Amine coupled ordered mesoporous (Co-N) co-doped TiO2: a green photocatalyst for the selective aerobic oxidation of thioether
Zou, Mingming1; Feng, Lu1; Thomas, Tiju3; Yang, Minghui1,2
刊名CATALYSIS SCIENCE & TECHNOLOGY
2017-09-21
DOI10.1039/c7cy00946a
7期:18页:4182-4192
收录类别SCI
文章类型Article
WOS标题词Science & Technology ; Physical Sciences
类目[WOS]Chemistry, Physical
研究领域[WOS]Chemistry
关键词[WOS]VISIBLE-LIGHT PHOTOCATALYSIS ; TITANIUM-DIOXIDE ; MOLECULAR-OXYGEN ; SULFIDES ; DEGRADATION ; IRRADIATION ; CATALYSIS ; OXIDE ; WATER ; NANOPARTICLES
英文摘要Usually oxygen cannot participate in the selective oxidation reaction of thioether to sulfoxide, which is attributed to its inactive feature. Although UV-light irradiation can activate O-2, this process also results in UV-induced hole (h(vb)(+)) generation. This oxidative species and O-2 can be consumed for the formation of free radical intermediates that leads to uncontrolled auto-oxidation products resulting in low selectivity. Current work aims to develop an approach for the aerobic oxidation of thioether to sulfoxide by exploring the synergy between triethylamine and mesoporous Co-N-TiO2 (nitrided @ 500 degrees C for 2 h) microspheres (with a large surface area: 124 m(2) g(-1)); the oxidation is carried out via visible-light photoredox catalysis. Triethylamine, due to its electron donating ability, acts as a redox mediator. With a lower band gap and level of conduction band minimum (-0.605 V vs. NHE), the Co-N-TiO2 sample has the ability to be an efficient and selective catalyst. Excellent conversion from the selective oxidation of thioanisole (76.4%) under 12 h visible light irradiation is observed. It may be noted that Co doping into TiO2 alone does not aid in obtaining a good photocatalyst; in fact this sample shows the Moss-Burstein effect. We have also shown that the reported photocatalyst is applicable for the conversion of several other thioethers to sulfoxides; generally high conversion rates and selectivities are observed. The reaction mechanisms are studied using UV-visible absorption spectra and the oxidation-extraction photometry (OEP) method. This result is likely useful for further exploration of surface complex photocatalysts for many other aerobic oxidation reactions.
语种英语
WOS记录号WOS:000411012900022
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文献类型期刊论文
条目标识符http://cas-ir.dicp.ac.cn/handle/321008/150038
专题中国科学院大连化学物理研究所
作者单位1.Chinese Acad Sci, Dalian Inst Chem Phys, 457 Zhongshan Rd, Dalian 116023, Peoples R China
2.Chinese Acad Sci, NIMTE, Solid State Funct Mat Res Lab, Ningbo 315201, Zhejiang, Peoples R China
3.Indian Inst Technol, Dept Met & Mat Engn, Madras 600036, Tamil Nadu, India
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Zou, Mingming,Feng, Lu,Thomas, Tiju,et al. Amine coupled ordered mesoporous (Co-N) co-doped TiO2: a green photocatalyst for the selective aerobic oxidation of thioether[J]. CATALYSIS SCIENCE & TECHNOLOGY,2017,7(18):4182-4192.
APA Zou, Mingming,Feng, Lu,Thomas, Tiju,&Yang, Minghui.(2017).Amine coupled ordered mesoporous (Co-N) co-doped TiO2: a green photocatalyst for the selective aerobic oxidation of thioether.CATALYSIS SCIENCE & TECHNOLOGY,7(18),4182-4192.
MLA Zou, Mingming,et al."Amine coupled ordered mesoporous (Co-N) co-doped TiO2: a green photocatalyst for the selective aerobic oxidation of thioether".CATALYSIS SCIENCE & TECHNOLOGY 7.18(2017):4182-4192.
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