Where k2 is the rate constant of the pseudo second order adsorption (gmg-1min-1), qe and qt are the amounts of CR
adsorbed (mg g-1) at equilibrium and at time t (min) respectively. The plot of t/qt vs t of eqn 9 gives a linear
relationship, from which, qe and k2 can be determined from the slope and intercept of the plot.