Fabrication of Ni−MOF−74@PA−PEI for Radon Removal under Ambient Conditions

Radon is one of the 19 carcinogenic substances identified by World Health Organization, posing a significant threat to human health and environment. Properly removing radon under ambient conditions remains challenging. Compared with traditional radon−adsorbent materials such as activated carbon zeolite, metal–organic framework (MOF) provide high specific surface area, rich structure, designability. However, MOF material powders demonstrate complications regarding practical use, easy accumulation, deactivation, difficult recovery. Ni−MOF−74 was in situ grown on porous polyacrylic acid (PA) spherical substrate via stepwise negative pressure impregnation. structured one−dimensional rod−shaped crystals (200–300 nm) large−pore PA microspheres, whose structure increased diffusion gas. The adsorption coefficient Ni−MOF−74@PA−polyethyleneimine composite 0.49 L/g (293 K, relative humidity 20%, air carrier). In comparison pristine powder, our exhibited enhanced longer penetration time. found be from two orders magnitude higher than that zeolite silica gel. proposed can used for while overcoming formation problem powders. Our preparation approach reference process MOFs polymers.