Current studies are examining different MOFs as structures for trapping and removing radon. Different pore structures, size, and shapes of adsorbents have been studied to gain a better understanding of a structure that could reliably trap radon atoms. A structure with large pores has no cavities to trap atoms within. Radon can easily enter this pore, but can exit just as easily. Structures with perfectly aligned pores work well to trap an atom, however, entering the pore is not feasible. Quasi-open pores serve as a compelling option; the uneven pores of the structure allow the atoms of interest to both enter and remain within the pores.
MOFs have been found to be effective structures for trapping specific particles present among other gases. Partially fluorinated MOFs were found to be efficient at capturing krypton within a mixture of krypton and xenon gasses. This ability to selectively capture particles is important when finding a MOF that will specifically capture radon. The effectiveness of one MOF, specifically designed for this purpose, was experimentally tested and confirmed for the adsorption of xenon gas. Once the adsorption ability was confirmed with xenon, adsorption of radon was measured, and concentrations of radon after exposure to the complex were at levels undetectable by RAD-7, a commonly used radon detector.
Finding an efficient, non-hazardous, and economical method of removing radon when levels are unsafe has been the focus of a great deal of research for decades. Originally, ventilation of homes and mechanical methods were the main mechanisms used for radon remediation. Methods of chemically reacting radon were studied for many years, with reactants such as halogen fluorides. Recent research has shifted toward the use of MOFs as a mechanism for trapping and removing radon.
The decay pathway of radon and the hazards it poses to humans are now well understood, and accurate mechanisms to test for radon concentrations in homes have been determined. The