In the removal of dyes from an aqueous solution, our magnetic carbon (adsorbent) follows pseudo-second-order kinetics. Hence, among the three materials (adsorbate(dyes), adsorbent (magnetic carbon) and water) which one cannot alter the rate?
How have you obtained a pseudo second order kinetic law? Normally, the rate of absorption should be proportional to the free surface of the absorbent. If water is involved in the rate of absorption, it should decrease it occupying a portion of the surface of the adsorbent.