The noble gas radon (Rn) is radioactive and can gravely harm the human body. As a result, capturing and dealing with Rn gas is an important task, in terms of radiation protection. The large specific surface area of graphene renders it a potential candidate for gas adsorption applications. Along these lines, in this work, theoretical calculations based on the density functional theory were presented to systematically explore the adsorption properties of Rn on transition metal (TM) functionalized graphene monolayer. The adsorption energies of Rn ...