Journal of the Serbian Chemical Society 2011 Volume 76, Issue 9, Pages: 1283-1294
https://doi.org/10.2298/JSC100226112K
Full text (
330 KB)
Cited by
Influence of chemical agents on the surface area and porosity of active carbon hollow fibers
Kljajević Ljiljana M.
(Vinča Institute of Nuclear Sciences, Belgrade)
Jovanović Vladislava M. (ICTM - Institute of Electrochemistry, Belgrade)
Stevanović Sanja I.
(ICTM - Institute of Electrochemistry, Belgrade)
Bogdanov Žarko D.
(Vinča Institute of Nuclear Sciences, Belgrade)
Kaluđerović Branka V. (Vinča Institute of Nuclear Sciences, Belgrade)
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.
Keywords: carbon hollow fibers, chemical activation, adsorption, cyclic Voltammetry