Two series of activated carbons were prepared from apricot stones by using carbonization followed by steam activation and one-step pyrolysis/activation in steam. The pore structure of the activated carbons was characterized by CO2 adsorption at 273 K and by N2 adsorption at 77 K. The macro-and mesoporosity were determined by mercury porosimetry. Optical microscopy, scanning electron microscopy (SEM) and environmental scanning electron microscopy (ESEM) were used to examine the microstructure of activated carbons. A considerable difference observed between the measured CO2 and N2 surface areas indicates a narrow microporosity in all the carbons. The two-step method produced better developed meso-and especially macroporosity. The SEM and optical micrographs show that one-step pyrolysis/steam activation preserves the original cell structure of the raw apricot stones. In general, the apparent surface areas of the two-step carbons are slightly higher than those of the one-step carbons. However, the one-step method would provide lower production costs because it would eliminate the separate carbonization stage.
All Science Journal Classification (ASJC) codes
- Materials Science(all)