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New Chalcogens Study Findings Reported from Institute of Chemistry (Determining the TiO2-Photocatalytic Aryl-Ring-Opening Mechanism in Aqueous...

July 22, 2014



New Chalcogens Study Findings Reported from Institute of Chemistry (Determining the TiO2-Photocatalytic Aryl-Ring-Opening Mechanism in Aqueous Solution Using Oxygen-18 Labeled O-2 and H2O)

By a News Reporter-Staff News Editor at Life Science Weekly -- Current study results on Chalcogens have been published. According to news reporting originating from Beijing, People's Republic of China, by NewsRx correspondents, research stated, "The molecules O-2 and H2O dominate the cleavage of aromatic sp(2) C-C bonds, a crucial step in the degradation of aromatic pollutants in aqueous TiO2 photocatalysis, but their precise roles in this process have remained elusive. This can be attributed to the complex oxidative species involved and to a lack of available models for reactions with a high yield of direct products."

Our news editors obtained a quote from the research from the Institute of Chemistry, "Here, we used oxygen-18 isotope labeled O-2 and H2O to observe the aromatic ring-opening reaction of the model compound 3,5-di-tert-butylcatechol (DTBC), which was mediated by TiO2 photocatalysis in an aqueous acetonitrile solution. By analyzing the primary intermediate products (similar to 75% yield), especially the seven-membered ring anhydrides that were formed, we obtained direct evidence for the oxygen atom of dioxygen insertion into a C-C bond of the aromatic ring. This indicates that molecular oxygen is the ultimate ring-opening agent in TiO2 photocatalysis and that it undergoes single O atom incorporation rather than the previously proposed molecular oxygen 1,2-addition processes."

According to the news editors, the research concluded: "The ratio of intradiol to extradiol products depends on the particle size of TiO2 catalysts used, which suggests that the O-2 activation is correlated with the available coordination sites on the TiO2 surface in the photocatalytic cleavage of the aromatic ring."

For more information on this research see: Determining the TiO2-Photocatalytic Aryl-Ring-Opening Mechanism in Aqueous Solution Using Oxygen-18 Labeled O-2 and H2O. Journal of the American Chemical Society, 2014;136(24):8714-8721. Journal of the American Chemical Society can be contacted at: Amer Chemical Soc, 1155 16TH St, NW, Washington, DC 20036, USA. (American Chemical Society - www.acs.org; Journal of the American Chemical Society - www.pubs.acs.org/journal/jacsat)

The news editors report that additional information may be obtained by contacting X.B. Pang, Chinese Academy Sci, Inst Chem, Key Lab Photochem, Beijing Natl Lab Mol Sci, Beijing 100190, People's Republic of China. Additional authors for this research include W. Chang, C.C. Chen, H.W. Ji, W.H. Ma and J.C. Zhao (see also Chalcogens).

Keywords for this news article include: Asia, Beijing, Chalcogens, Photocatalyst, Nanotechnology, Photocatalytic, Emerging Technologies, People's Republic of China

Our reports deliver fact-based news of research and discoveries from around the world. Copyright 2014, NewsRx LLC


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Source: Life Science Weekly


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