The qe and k2 values were estimated
from the slope (1/qe) and intercept (1/k2q2e
) of the linear plot of t/qt
versus t at different dye concentrations.
From the data in Table 1 and Fig. 6(b), the plots according to
the pseudo-second-order model provided high correlation coefficients
of more than 0.997 and excellent linearity at the three
temperatures. Moreover, the calculated value of qe is very close
to the experimental qe, with deviations of less than 2%. Therefore,
the adsorption process is best described by a pseudo-second-order