The effects accompanying passing current through a granular bed of activated carbon
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Repeatedly passing current of high intensity (2 A) in the pulsing mode through a granular bed of activated carbon was accompanied by changes of bed resistance. These changes did not diminish when the current stopped but proceeded during 2 to 10 days of exposure.
X-ray lattice parameters of the carbon before and after it was subjected to numerous current pulses have been measured. The second sample differed considerably because it was more amorphous. Nitrogen and water adsorption isotherms on these samples have been measured. They showed a reduction of specific surface area (volume of micropores) and probably an increase of the average diameter of mesopores.
The observed significant changes of carbon texture and structure are explained by inductive electromechanical interactions between planar layers of carbon atoms in microcrystallites of activated carbon during pulses of passing current.
Keywordsactivated carbon characterization of properties regeneration
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