Specific Surface Area
≥1500 ㎡/g
ZIFs have advantages over zeolites such that the hybrid framework structures are expected to have more flexibility in surface modification. Among a large variety of ZIFs, ZIF-8 is the most representative one first synthesized by Chen’s group, and then systematically named by the Yaghi’s group. It can be fabricated by zinc and mIm with a sodalite structure consisting of a four- and a six-membered ring ZnN4 cluster, which has good thermal and chemical stability, especially large specific surface area, adjustable porosity and abundant active sites.
As we all know, ZIF-8 has shown up distinguished advantages and advances in adsorption, gas separation, drug delivery, catalysis and biosensor. ZIF-8 possesses the typical cubic sodalite topology with 11.6 Å large β-cages, which are connected by 6-membered ring windows (~3.4 Å). ZIF-8 and its membranes perform significant sieving advantages over ultramicroporous zeolites in selective separation of gas mixture contributing to the narrow six-membered ring pores (~3.4 Å) and hydrophobic behavior.
Q
What are the core technical parameters of ZIF-8?
ZIF-8 features a particle size of approximately 600 nm, a high specific surface area of ≥1500 ㎡/g, and a pore size ranging between 0.8 and 1.8 nm.
Q
What structural components form ZIF-8?
ZIF-8 is fabricated using zinc and mIm, forming a sodalite structure composed of four- and six-membered ring ZnN4 clusters.
Q
Why does ZIF-8 offer better performance than traditional zeolites?
ZIF-8 hybrid framework structures provide greater flexibility in surface modification, combined with superior thermal and chemical stability, adjustable porosity, and hydrophobic properties.
Q
What are the primary application fields for ZIF-8?
ZIF-8 is widely utilized in adsorption, gas separation, drug delivery systems, catalysis, and advanced biosensors.
Q
How does ZIF-8 perform in selective gas separation?
ZIF-8 possesses 11.6 Å β-cages connected by narrow 6-membered ring windows (~3.4 Å). This pore structure, along with its hydrophobic nature, gives it exceptional molecular sieving performance over ultramicroporous zeolites.
Q
Who originally synthesized and named ZIF-8?
ZIF-8 was first synthesized by Chen’s group and subsequently systematically named by Yaghi’s group.
