Influence of chemical agents on the surface area and porosity of active carbon hollow fibers
| Autor: | M Ljiljana Kljajevic, M Vladislava Jovanovic, I Sanja Stevanovic, V Branka Kaludjerovic, D Zarko Bogdanov |
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| Rok vydání: | 2011 |
| Předmět: |
Materials science
Inorganic chemistry 02 engineering and technology 010402 general chemistry Electrochemistry 01 natural sciences lcsh:Chemistry chemistry.chemical_compound Adsorption Specific surface area Oxidizing agent Polysulfone Hydrogen peroxide Porosity General Chemistry Microporous material 021001 nanoscience & nanotechnology cyclic voltammetry 0104 chemical sciences lcsh:QD1-999 chemistry carbon hollow fibers adsorption chemical activation 0210 nano-technology |
| Zdroj: | Journal of the Serbian Chemical Society, Vol 76, Iss 9, Pp 1283-1294 (2011) Journal of the Serbian Chemical Society |
| ISSN: | 1820-7421 0352-5139 |
| Popis: | Active carbon hollow fibers were prepared from regenerated polysulfone hollow fibers by chemical activation using: disodium hydrogen phosphate 2-hydrate, disodium tetraborate 10-hydrate, hydrogen peroxide, and diammonium hydrogen phosphate. After chemical activation fibers were carbonized in an inert atmosphere. The specific surface area and porosity of obtained carbons were studied by nitrogen adsorption-desorption isotherms at 77 K, while the structures were examined with scanning electron microscopy and X-ray diffraction. The activation process increases these adsorption properties of fibers being more pronounced for active carbon fibers obtained with disodium tetraborate 10-hydrate and hydrogen peroxide as activator. The obtained active hollow carbons are microporous with different pore size distribution. Chemical activation with phosphates produces active carbon material with small surface area with but with both mesopores and micropores. X-ray diffraction shows that besides turbostratic structure typical for carbon materials, there are some peaks which indicate some intermediate reaction products when sodium salts were used as activating agent. Based on data from the electrochemical measurements the activity and porosity of the active fibers depend strongly on the oxidizing agent applied. |
| Databáze: | OpenAIRE |
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