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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.

Influence of chemical agents on the surface area and porosity of active carbon hollow fibers