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1
Content available remote Influence of thermal treatment on the physical, mechanical and sorption characteristics of the basalt tufa
Kobasa I., Mikuła J., Woloschuk A., Tsymbaliuk W.
Czasopismo Techniczne. Mechanika
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2011
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R. 108, z. 5-M
3-9
EN
Different methods of classical chemical analysis, flame photometry and atom-absorption spectroscopy were used to check chemical composition of the basalt tufa which is a natural alumosilicate with Si/Al ratio 4.5-4.7. Thermal treatment of the tufa at 105-500[degrees]C. can activate its sorption capacity of NH4[^+] ions. Thermal treatment of the tufa particles at higher temperatures results in decreasing of the sorption activity, specific surface area and porosity and increase in the wear-off coefficient.
PL
Różne metody klasycznej analizy chemicznej, fotometrii płomieniowej i spektroskopii atomowo-absorpcyjnej zostały wykorzystane do stwierdzenia składu chemicznego tufu bazaltowego jako naturalnego glinokrzemiany ze stosunkiem Si/Al, w zakresie 4,5-4,7. Obróbka cieplna tufu w zakresie temperatur od 105 do 500[stopni]C może aktywować jego sorpcyjną pojemność w relacji do jonów NH4[^+]. Obróbka cieplna cząstek tufu w wysokich temperaturach zmniejsza jego aktywność sorpcyjną, powierzchnie właściwą i porowatość oraz powoduje wzrost współczynnika odporności na ścieranie.
2
Content available remote Organic dye sensitisers for solar cells and semiconductor photocatalysts - a method for suitability evaluation explained
Gusiak N., Kobasa I., Kurek S.
Czasopismo Techniczne. Chemia
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2011
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R. 108, z. 2-Ch
59-73
EN
Six polymethine dyes potentially suitable to use for dye sensitised solar cells and photocatalysts were studied. Electrochemical and spectral data have shown that LUMo levels of the dyes will provide high driving forces for electron injection ranging from 0.55 to 1.0 eV and only three dyes could be used with triiodide/iodide redox system applied for oxidised dye regeneration. The calculation method was explained in detail.
PL
Zbadano sześć barwników polimetinowych potencjalnie nadających się do użycia do baterii słonecznych i fotokataliza torów sensybilizowanych barwnikami. Dane elektrochemiczne i spektralne wykazały, że poziomy LUMO barwników zapewnią wysokie siły napędowe dla przeniesienia elektronu, ale tylko trzy barwniki można użyć z systemem trijodek/jodek stosowanym do regeneracji barwnika. Metodę obliczeniową szczegółowo objaśniono.
3
Influence of Admixtures of f-Elements on Photocatalytic,Electrophysical and Magnetic Properties of TiO2
Wlodarczyk L., Kobasa I.
Polish Journal of Chemistry
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2007
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Vol. 81, nr 4
591-598
EN
It has been shown that photocatalytic activity, surface electroconductivity, and magnetic susceptibility of TiO2 significantly depend on the character and concentration of f-element’s admixture as well as on the temperature and conditions of its thermo-treating. Admixtures of f-elements with variable valence and relatively smaller ionic radius are more effective to reach higher photocatalytic activity, surface electroconductivity, and magnetic susceptibility. Above mentioned parameters of TiO2 increase with addition of a small amount of f-elements as well as after thermo-treating of a sample at 673–873 K in the reducing medium. Photocatalytic activity, electroconductivity, and magnetic susceptibility decrease on the following conditions: increase of an admixture content, thermo-processing in the oxidizing medium or at higher temperature.
4
Semi-Conductive Materials Based on the Titanium Dioxide Doped with Zinc: Catalytic Activity for Copper Deposition and Effect of UV-Irradiation
Kobasa I.
Polish Journal of Chemistry
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2004
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Vol. 78 / nr 4
553-560
EN
Novel semiconductive materials containing TiO2 dispersion, doped with zinc and additional modifying salts of Cu2+, Fe2+, and Co2+, have been obtained. Such materials can be used as effective catalysts in the Cu2+ reduction. Exposition to UV-light followed by the dark storage leads to complex changes of the catalytic activity of TiO2products. Detailed character of the changes depends on the presence of a doping agent and on the nature of modifying salts' anion. The scheme of the electron transfer processes has been proposed to describe changes of the activity.
5
Catalytic Electrolysis-Free Copper Deposition Using Dispersions of Titanium Dioxide with Adsorbed Trespassing Metal Ions
Kobasa I.
Polish Journal of Chemistry
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2004
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Vol. 78 / nr 1
117-123
EN
It has been found that modification of TiO2 by impregnation with Pd2+, Cu2+, Fe2+, Fe3+ and Co2+ salts causes a significant rise of its catalytic activity in the reaction of metal copper deposition. Influence of nature of modifying cation, its concentration, counter-anion concentration and the effect of double modification by two different salts have also been investigated. Comparison of energetic characteristics of all intermediate compounds led us to a possible model of catalytic deposition of copper, explaining the increased catalytic activity of the modified examples.
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