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.