It is clear from the SEM micrograph presented in Fig. 7(a), the
grapeseed activated carbon adsorbent had also a porosed surface.
The copper adsorption of grapeseed activated carbon, which has the
BET surface area of 916m2/g and iodine number of 601 mg/g is little
different from chestnut shell activated carbon. The reason of more
micropore structure of chestnut shell activated carbon is that the
chestnut shell raw material has more cellulose content (% 58.95)
than grapeseed raw material (% 44.40) [32]. The porosity parameters
of the activated carbons obtained from different agricultural
residues suggest that the differences in the lignin and cellulose
contents of the precursors can influence the porous structure of
the activated carbons. Materials with a greater content of lignin
develop activated carbons with macroporous structure, while raw
materials with a higher content of cellulose yield activated carbon
with a predominantly microporous structure [12].