The significance effect of initial dye concentration on adsorption capacity and color removal had also been discussed in literature.
Safa and Bhatti (2011) have argued that the initial dye concentration is a driving force that can overcome mass transfer resistance present between the dye molecules in aqueous solution and adsorbent particles.
Thus, the number of dye molecules competing for adsorption on the adsorbent surface increases at higher initial dye concentration leading to higher adsorption capacity.
Nasuha et al. (2010) reported an increase in the adsorption capacity of tea waste from 18.6 to 134 mg/g against an increase in the concentration of MB dye from 50 to 500 mg/L. Similarly,