where A0 is initial absorbance of the dye (A), At is effluent
absorbance of the dye at time t, Ae is equilibrium absorbance of the
dye, k1 (min1) and k2 (A1 min1) are the rate constants of the
first-order and second-order kinetic equations. The slopes and
intercepts of these graphs were used to determine the values of k1
and k2 at different initial temperatures. The linearized pseudofirst-
order kinetic model (Fig. 6 and Table 3), provided much better
R2 values than those for the
first order, second-order and pseudosecond-
order model (Table 3).