in Table 1. All RL values obtained are greater than zero and less than unity indicates the favorable adsorption of Cr (VI) by EMCMCR under consideration. This means that the equilibrium isotherms can be well described by the Langmuir model, and the adsorption process is monolayer adsorption onto a surface with finite number of identical sites, which are homogeneously
distributed over the adsorbent surface.