Fig. 5: Breakthrough curves for SIFSIX-3-Cu.

a Single-bed breakthrough experiment using 1000 ppm Kr balanced with dry air. b Single-bed breakthrough experiment using 400 ppm Xe and 40 ppm Kr balanced with dry air. c Two-bed breakthrough experiment using 400 ppm Xe and 40 ppm Kr balanced with dry air. d schematic demonstration of the concept of the two-bed technique for the 85Kr removal from the UNF.