The pseudo-second-order kinetic model fits better than the other two
models for the metal-organic
NiFe2O4@SiO2@HKUST-1
nanocomposite synthesized at x = 30% wt. Because as calculated from the
above relation of the determinant coefficient R2 for
the pseudo-second-order model, all the coefficients are very close to
one while the two models, pseudo-first-order and intramolecular
infiltration, respectively, relative to the pseudo-first-order model of
one, they are more distant. Therefore, it can be concluded that the
methylene blue dye adsorption kinetic using the desired nanocomposites
at different concentrations of the methylene blue dye solution follows
pseudo-second-order kinetics [64-72]. On the other hand, the amount
of (qe)cal absorption obtained from the above equations
in the kinetic pseudo-second-order absorption model is much closer to
the empirical value of (qe)exp. In Table 2 the values of
the coefficient of determination of R2, as well as the
rate of absorption and the amount of adsorption for all three kinetic
models considered, are calculated and presented in different
concentrations of methylene blue dye.