The adsorption capacity of Cr(VI) on LSAC was compared with
other activated carbons reported in literature and shown in
Table 7. It can be seem from Table 7 that the activated carbon
prepared by hazelnut shell shows the greatest adsorption capacity
compared with the other activated carbons, which may be
primarily owing to the initial carbon content, activation process
as well as the pore development due to the basic morphology of the
raw material. LSAC also shows a very high adsorption capacity at
low initial concentration. Moreover, it can be observed that it is of
great benefit for adsorption at lower pH value in all cases whatever
the synthesis method of activation is. Therefore, LSAC can be
considered a effective adsorbent for the removal of Cr(VI) from
aqueous solutions, because of the cheap availability and very
suitability for the production of activated carbon from longan seed