Fig. 5 shows an Arrhenius type plot with ln(flux) versus 1/T for water
permeation through the ZIF-8 membranes. The linear trend in the plot
indicates that water permeation through the ZIF-8 membranes is an ac-
tivated diffusion process, and the apparent activation energy (Eact) is
about 10.5 kJ·mol−1
, which is comparable to that of water permeation
in zeolite membranes [55].