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Solvatochromic Probes Absorbance Behavior in Mixtures of 2-Hydroxy ethyl ammonium formate with methanol, ethylene glycol and glycerol
, Article Journal of Solution Chemistry ; Volume 39, Issue 10 , October , 2010 , pp 1509-1519 ; Harifi-Mood, A. R. (Ali Reza) ; Elahifard, M. R. (Mohammad Reza) ; Gholami, M. R. (Mohammad Reza) ; Sharif University of Technology
Abstract
Solute-solvent and solvent-solvent interactions were investigated for binary mixtures of an ionic liquid (IL) 2-hydroxy ethylammonium formate as with methanol, ethylene glycol and glycerol. The physicochemical properties of the solvent mixtures at 25 °C, over the whole range of mole fractions, were determined using solvatochromic probes. High normal polarity ( ENT ) in the alcohol-rich region confirms solute-solvent interactions in this medium. Dipolarity/polarizability (π ∗) show a different trend to ENT with a positive deviation from ideal behavior in IL-glycerol mixtures. However, these deviations for other solvent mixtures are insignificant. Contrary to what is observed for ENT and π ∗,...
Investigation of the antibacterial and photocatalytic properties of the zeolitic nanosized AgBr/Tio2 composites
, Article Materials Science in Semiconductor Processing ; Volume 15, Issue 1 , February , 2012 , Pages 73–79 ; Elahifard, M. R. (Mohammad Reza) ; Vatan Meidanshahi, R. (Reza) ; Ghasemi, S. (Shahnaz) ; Haghighi, S. (Saeed) ; Gholami, M. R. (Mohammad Reza) ; Sharif University of Technology
Abstract
Zeolite-based Ag/AgBr and Ag/AgBr/TiO2 photocatalysts were prepared by sol–gel and deposition methods and were characterized. Their photocatalytic activities were evaluated by inactivation of Escherichia (E.) coli and the photodegradation of Acid Blue 92 and potassium permanganate. The composites containing Ag/AgBr showed the antibacterial activity in the dark by releasing Ag+ ions into the medium. The results for inactivation of E. coli indicated that Ag/AgBr/TiO2 modified photocatalyst had better antibacterial activity than Ag/AgBr/zeolite, while zeolite and TiO2/zeolite did not show any antibacterial activity under visible light and dark conditions. Photodecolarization rate was affected...