3.1 Characterization of adsorbents before iodine adsorption
The nitrogen adsorption/desorption isotherm and pore size distribution
of the adsorbent are shown in Figure 1 and Figure 2 below. It can be
seen that it basically conformed to the type-I adsorption isotherm,
indicating that the pores in the adsorbent were mainly micropores. The
specific surface area of the adsorbent was 312.2 mg
g-1, and total pore volume was 0.27 mL
g-1. The pore size was mainly concentrated at 0.59 nm.
Figure 1 Nitrogen adsorption-desorption isotherm measured at 77 K
Figure 2 Pore size distribution of silicalite-1