4. Results and discussion
4.1. Effect of adsorbent dose on dye adsorption
Fig. 1 shows the effect of adsorbent dose (W (g)) on the removal
of MB at C0 = 50 mg/L and 30 ◦C. It can be seen that the MB removal
increases with increase W up to 0.40 g, thereafter remained fairly
constant despite increase in the amount of the PS to 1.0 g. At equilibrium time, the % removal increased from 34.67 to 80% for an
increase in PS dose from 0.05 to 0.40 g. The increase in % removal
was due to the increase of the available sorption surface and availability of more adsorption sites. A similar behavior was reported for
the adsorption of methylene blue on peanut hull [26] and invasive
marine seaweed (Caulerpa racemosa var. cylindracea) [27].