The effect of pH on the COD and BOD reduction from
wastewater is shown in Fig. 4. The optimum pH for maximum
adsorption of organic impurities from wastewater by
commercial activated carbon was 2 and by mixed adsorbent
carbon was 7. It was clear that CAC shows better
adsorption at lower pH and MAC at higher pH values.
Thus, CAC showed maximum adsorption in the domain
of acidic pH while MAC in the neutral pH domain.