Membrane separation of krypton and xenon

The increasing use of krypton (Kr) and xenon (Xe), along with the demand for managing radioactive isotopes of these gases, has sparked extensive interest in their separation. Membrane separation offers an energy-efficient and cost-effective solution for Kr/Xe separation under mild operation conditions. Microporous materials, such as metal–organic frameworks (MOFs), covalent-organic frameworks (COFs), and zeolites have been involved in the Kr/Xe membrane separation, due to their highly porous structure and uniform pore size. However, the development of high-performance Kr/Xe separation membranes is still challenging, and only limited progress has been achieved in this area. In this review, the recent development and advances of porous membranes for Kr/Xe separation are highlighted, and a perspective on further research is provided.