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题名: Amine coupled ordered mesoporous (Co-N) co-doped TiO2: a green photocatalyst for the selective aerobic oxidation of thioether
作者: Zou, Mingming1;  Feng, Lu1;  Thomas, Tiju3;  Yang, Minghui1, 2
刊名: CATALYSIS SCIENCE & TECHNOLOGY
发表日期: 2017-09-21
DOI: 10.1039/c7cy00946a
卷: 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
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.
关键词[WOS]: VISIBLE-LIGHT PHOTOCATALYSIS ;  TITANIUM-DIOXIDE ;  MOLECULAR-OXYGEN ;  SULFIDES ;  DEGRADATION ;  IRRADIATION ;  CATALYSIS ;  OXIDE ;  WATER ;  NANOPARTICLES
语种: 英语
WOS记录号: WOS:000411012900022
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/150138
Appears in Collections:中国科学院大连化学物理研究所_期刊论文

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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

Recommended Citation:
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.
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