Fig. 7 shows pseudo second
- order kinetics plot for the adsorption of CR dye by E. crassipes roots at different concentrations. The rate
constants, predicted equilibrium uptakes and the corresponding correlation coefficients for all concentrations tested
have been calculated and summarized in Table 2. It can be seen that the correlation coefficients for the pseudo-firstorder
kinetic model was very high (R2 > 0.99) and the theoretical qe,cal values were closer to the experimental qe,exp
values at all studied initial CR concentrations indicating that the adsorption of CR onto E. crassipes roots perfectly
follow pseudo second order kinetic model.