KAv is the Avrami constant and nAv is the Avrami model exponent of time related to the change in mechanism of adsorption. KAv and nAv can be obtained from the intercept and slope of the plot of ln[ln(1α)] against lnt.
The nonlinear and linear forms of Fractional power kinetic model equation are depicted by (Eqs. (14) and 15) respec-
tively;