High‐Silica CHA Zeolite Membrane with Ultra‐High Selectivity and Irradiation Stability for Krypton/Xenon Separation

Abstract

Capture and storage of the long-lived 85 Kr is an efficient approach to mitigate the emission of volatile radionuclides from the spent nuclear fuel reprocessing facilities. However,itischallenging to separate krypton (Kr) from xenon (Xe) because of the chemical inertness and similar physical properties.H erein we prepared high-silica CHA zeolite membranes with ultra-high selectivity and irradiation stability for Kr/Xe separation. The suitable aperture sizea nd rigid framework endures the membrane as trong size-exclusion effect. The ultrahigh selectivity of 51-152 together with the Kr permeance of 0.7-1.3 10 À8 mol m À2 s À1 Pa À1 of high-silica CHA zeolite membranes far surpass the state-of-the-art polymeric membranes.T he membrane is among the most stable polycrystalline membranes for separation of humid Kr/ Xe mixtures.T ogether with the excellent irradiation stability, high-silica CHA zeolite membranes pave the way to separate radioactive Kr from Xe for anotable reduction of the volatile nuclear waste storage volume.

State-of-the-Art Organic- and Inorganic-Based Hollow Fiber Membranes in Liquid and Gas Applications: Looking Back and Beyond

“…This membrane showed excellent krypton/xenon permeation selectivity. Meanwhile, Wang et al fabricated a high-silica CHA zeolite membrane to capture krypton over xenon selectively [ 625 ]. As a result, krypton/xenon selectivity was up to 146 [ 625 ], which outperformed the hollow fiber SAPO-34 membranes, which was only 31.7 [ 624 ].…”

“…Meanwhile, Wang et al fabricated a high-silica CHA zeolite membrane to capture krypton over xenon selectively [ 625 ]. As a result, krypton/xenon selectivity was up to 146 [ 625 ], which outperformed the hollow fiber SAPO-34 membranes, which was only 31.7 [ 624 ]. Moreover, the fabricated membrane also showed an outstanding radioactive resistance to more than 100 kGy of radiation.…”

Effect of Activation Process on the Performance of ZIF‐8 Membrane for Propylene/Propane Separation

“…Polymer-based membranes dominate desalination and wastewater treatment [4], while failing to serve for highly efficient gas separation because of the inherent trade-off between membrane permeability and selectivity [5,6]. Inorganic membranes represented by zeolite [7][8][9][10], carbon molecular sieves [11][12][13] and metal-organic frameworks (MOFs) [14,15] manifest exemplarily size-exclude characteristics as a consequence of their unique micropore structure, which could overcome the trade-off effect. Among them, MOFs are crystalline porous materials that are assembled through metal nodes (clusters) bridging with ligands from a periodic reticular lattice [16,17].…”