By a News Reporter-Staff News Editor at Life Science Weekly -- Investigators publish new report on Photocatalytics. According to news originating from Houston, Texas, by NewsRx correspondents, research stated, "A new method of modifying TiO2 photocatalysts with SiO2 is developed in which SiO2 nanoparticles are simply mixed with TiO2 in water under ambient conditions. This method does not require the use of toxic solvents or significant energy input."
Our news journalists obtained a quote from the research from Rice University, "Although the SiO2 modification slightly reduces hydroxyl free radical production, the composite SiO2-TiO2 nanomaterials have markedly higher photocatalytic inactivation rates for a common surrogate virus, bacteriophage MS2 (up to 270% compared to the unmodified TiO2), due to the greatly improved adsorptive density and dark inactivation of MS2. The Langmuir isotherm describes the adsorption data well and shows that the TiO2 modified with 5% SiO2 has a maximum adsorption density qmax 37 times that of the unmodified TiO2. The Langmuir-Hinshelwood model fits the photocatalytic inactivation kinetic data well. The SiO2-TiO2 material produces a greater maximum initial inactivation rate yet a lower intrinsic surface reaction rate constant, consistent with the reduced hydroxyl radical production and enhanced adsorption. These results suggest that modifying photocatalyst surface to increase contaminant adsorption is an important strategy to improve photocatalytic reaction efficiency."
According to the news editors, the research concluded: "Simple and cheap synthesis methods such as that used in this study bring photocatalysis closer to being a viable water treatment option."
For more information on this research see: Silica decorated TiO2 for virus inactivation in drinking water--simple synthesis method and mechanisms of enhanced inactivation kinetics. Environmental Science & Technology, 2013;47(12):6463-70. (American Chemical Society - www.acs.org; Environmental Science & Technology - www.pubs.acs.org/journal/esthag)
The news correspondents report that additional information may be obtained from M.V. Liga, Dept. of Civil and Environmental Engineering, Rice University, Houston, Texas 77005, United States. Additional authors for this research include S.J. Maguire-Boyle, H.R. Jafry, A.R. Barron and Q. Li (see also Photocatalytics).
Keywords for this news article include: Texas, Houston, Viruses, Virology, United States, Photocatalyst, Nanotechnology, Emerging Technologies, North and Central America.
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