3.3 Iodine adsorption kinetic
In order to further explore the kinetic performance of the adsorption process, the adsorption process curve was fitted as shown in Figure 5-6. The kinetic model constants and correlation coefficients of iodine adsorption are shown in Table 2. The results showed that the adsorption process for shaped silicalite-1 conformed to the pseudo first-order adsorption kinetic equation, qt=642.6×(1-e-0.05t)(R2=0.988). The adsorption processes for shaped silicalite-1 was controlled by the diffusion steps, manifesting the adsorption rate was proportional to the difference between the equilibrium adsorption capacity and the adsorption capacity at certain time.
Figure 5 Iodine uptake curves for shaped silicalite-1 using pseudo- first-order adsorption kinetic equation
Figure 6 Iodine uptake curves for shaped silicalite-1 using pseudo-second-order adsorption kinetic equation
Table 2 The kinetic model constants and correlation coefficients of iodine adsorption by shaped Silicalite-1 adsorbent