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Findings from Korea Institute of Science and Technology Has Provided New Data on Environmental Calalysis

May 30, 2014

By a News Reporter-Staff News Editor at Ecology, Environment & Conservation -- Current study results on Environmental Calalysis have been published. According to news reporting from Seoul, South Korea, by VerticalNews journalists, research stated, "Visible light photocatalysis by TiO2 nanoparticles modified with both fullerol complexation and Nb-doping (fullerol/Nb-TiO2) demonstrated an enhanced performance. Nb-doped TiO2 (Nb-TiO2) was firstly prepared by a conventional sol-gel method, and subsequently fullerol was adsorbed on the surface of Nb-TiO2."

The news correspondents obtained a quote from the research from the Korea Institute of Science and Technology, "The physicochemical and optical properties of as-prepared fullerol/Nb-TiO2 were analyzed by various spectroscopic methods (TEM, EELS, XPS, and DRS). The adsorption of fullerol on Nb-TiO2 surface increased the visible light absorption through a surface-complex charge-transfer (SCCT) mechanism. Nb-doping enhanced the charge transport and induced the Ti cation vacancies that retarded the recombination of photo-generated charge pairs by trapping the electrons injected from the HOMO level of fullerol. Due to the advantage of simultaneous modification of fullerol and Nb-doping, the visible light photoactivity of fullerol/Nb-TiO2 was more enhanced than either Nb-TiO2 or fullerol/TiO2. The photocatalytic activities of fullerol/Nb-TiO2 for the reduction of chromate (Cr-VI), the oxidation of iodide, and the degradation of 4-chlorophenol were all higher than bare TiO2 and singly modified TiO2 (i.e., Nb-TiO2 and fullerol/TiO2) under visible light (lambda >420 nm). A similar result was also confirmed for their photoelectrochemical behavior: the electrode made of fullerol/Nb-TiO2 exhibited an enhanced photocurrent under visible light. On the other hand, the decay of open-circuit potential of the fullerol/Nb-TiO2 electrode after turning off the visible light was markedly slower than either that of Nb-TiO2 or fullerol/TiO2, which implies the retarded recombination of photo-generated charge pairs on fullerol/Nb-TiO2. In addition, the electrochemical impedance spectroscopic (EIS) data supported that the charge transfer resistance is lower with the fullerol/Nb-TiO2 than either Nb-TiO2 or fullerol/TiO2."

According to the news reporters, the research concluded: "This specific combination of the bulk (Nb-doping) and surface (fullerol complexation) modifications of titanium dioxide might be extended to other cases of bulk+surface combined modifications."

For more information on this research see: Visible light photocatalysis of fullerol-complexed TiO2 enhanced by Nb doping. Applied Catalysis B-Environmental, 2014;152():233-240. Applied Catalysis B-Environmental can be contacted at: Elsevier Science Bv, PO Box 211, 1000 Ae Amsterdam, Netherlands.

Our news journalists report that additional information may be obtained by contacting J. Lim, Korea Inst Sci & Technol, Center Water Resources Cycle Res, Seoul 136791, South Korea. Additional authors for this research include D. Monllor-Satoca, J.S. Jang, S. Lee and W. Choi.

Keywords for this news article include: Asia, Seoul, South Korea, Environmental Calalysis

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Source: Ecology, Environment & Conservation

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