Reports from Fuzhou University Advance Knowledge in Photocatalytics (Origin of superior photocatalytic activity in rutile TiO2 hierarchical microspheres: The dominate role of "microcavity" structure)
By a News Reporter-Staff News Editor at Science Letter -- Researchers detail new data in Photocatalytics. According to news reporting originating from Fuzhou, People's Republic of China, by NewsRx correspondents, research stated, "This paper aims to investigate the role that hierarchical structure plays in photocatalytic process. Hierarchical rutile TiO2 microspheres assembled by nanowires bundles were initially synthesized and then treated by thermal annealing or ultrasonic irradiation."
Our news editors obtained a quote from the research from Fuzhou University, "Various technologies including SEM, XRD, DRS, and N-2 sorption were employed to investigate the effect of post-treatments on the microstructures of TiO2 samples. The results revealed that annealing treatment caused obvious growth of particle size, decreased surface area and pore volume, and weakened optical absorbance, while ultrasonic irradiation had little influence on these properties. However, both annealing treatment and ultrasonic irradiation seriously destroyed the microcavity structure which existed in between the roughly parallel nanowires of hierarchical TiO2 microspheres. The existence of microcavity in these TiO2 hierarchical microspheres was proved to be crucial to the photoactivity toward degradation of methyl orange (MO). It has been proposed that the microcavities could act as microcapacitors for electronic storage and therefore contribute to a high separation efficiency of photogenerated electron-hole pairs. On the basis of ESR and active species scavenger experiments, h(+) was found to be the primary active species in MO degradation while center dot O-2- slightly promoted the degradation efficiency via the formation of center dot OH."
According to the news editors, the research concluded: "This finding is of great significance for the design of efficient photocatalytic materials with potential applications in solving worldwide energy crisis and environmental pollution."
For more information on this research see: Origin of superior photocatalytic activity in rutile TiO2 hierarchical microspheres: The dominate role of "microcavity" structure. Applied Catalysis A-General, 2014;478():204-210. Applied Catalysis A-General can be contacted at: Elsevier Science Bv, PO Box 211, 1000 Ae Amsterdam, Netherlands (see also Photocatalytics).
The news editors report that additional information may be obtained by contacting T.J. Yan, Fuzhou Univ, State Key Lab Photocatalysis Energy & Environm, Res Inst Photocatalysis, Fuzhou 350002, People's Republic of China. Additional authors for this research include R.S. Yuan, W.J. Li and J.M. You.
Keywords for this news article include: Asia, Fuzhou, Nanowire, Photocatalyst, Nanotechnology, 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