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The surface area

The surface area, pore size and structure properties can be examined using the N2 adsorption-desorption isotherms which is usually measured at 77 K, utilizing the theory on Brunauer-Emmett-Teller (BET), respectively. Type I isotherms are of a microporous materials while type IV isotherms are of a mesoporous materials 35. In Figure 8, the ZIF-8 and ZIF-67 materials exhibits the type I adsorption isotherms showing an immensely high level of N2 adsorption at very low relative pressure, and this indicates a microporous nature of the ZIF-8 which is consistent with ZIF-67. The surface area of the ZIF materials are usually very high and they ranges from 1000 to 2000 m2.g-1 depending on the method and conditions used during syntheses 35,36,37. Fei et al reported that introduction of redox-active transition metal to the framework, reduces the surface area and pore size of the ZIF materials


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