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Search: WFRF:(Goranova T)

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  • Budinova, T., et al. (author)
  • Characterization and application of activated carbon produced by H3PO4 and water vapor activation
  • 2006
  • In: Fuel processing technology. - : Elsevier BV. - 0378-3820 .- 1873-7188. ; 87:10, s. 899-905
  • Journal article (peer-reviewed)abstract
    • Activated carbons have been prepared from woody biomass birch by using various activation procedures: a) treatment with phosphoric acid and pyrolysis at 600 degrees C in inert atmosphere, b) the same as in (a) followed by steam activation at the same temperature and c) treatment with phosphoric acid and direct pyrolysis in a stream of water vapor at 700 degrees C. The surface area and the porosity of the activated carbons were strongly dependent on the treatment after impregnation with H3PO4 (pyrolysis in inert atmosphere, steam pyrolysis or combination of both). Activated carbon, prepared by impregnation with phosphoric acid followed by steam pyrolysis (steam activation) had highly developed porous structure and the largest surface area among all prepared carbons (iodine number 1280 mg/g and BET surface area 1360 m(2)/g). The adsorption capacity of this sample for Hg(II) from aqueous solution was studied in varying treatment conditions: contact time, metal ion concentration and pH. The adsorption followed Langmuir isotherms and the adsorption capacity for Hg(II) at 293 K was 160 mg/g.
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  • Toneva, A, et al. (author)
  • FeSi2 thin films investigated by X-ray photoelectron and infrared spectroscopy
  • 2000
  • In: Vacuum. - 0042-207X .- 1879-2715. ; 58:2-3, s. 420-427
  • Journal article (peer-reviewed)abstract
    • Thin films of iron silicide prepared by ion-beam and by electron-beam evaporation of iron on silicon substrates and following rapid thermal processing are investigated. Low-energy argon ion sputtering of surface layer is used for depth profile XPS analysis. The Si2p, Fe2p3/2, O1s and C1s electron spectra are recorded. On the basis of established binding energies and infrared transmission spectra (200–600 cm−1) conclusion are made about the effect of the annealing temperature and duration on the chemical bond type and phase composition of the iron silicide films.
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