Five samples of activated carbon were produced independently following the same procedure, dried in an oven overnight at 110 ◦C, mixed together, homogenized and sieved to 0.250, 0.149 and 0.074mm sizes, respectively. Chemical modification of indigenously prepared activated carbon was done by immersing 5 g of adsorbent in 100 mL, 1N aqueous solution
of each acid, i.e., HCl, H2SO4 and H3PO4 and critical micellar
solution of CTAB for 4 h.