Methyl-functionalized anionic MOFs for charge- and shape-selective adsorption of dyes in water remediation

A methyl-functionalized MOF exhibits dual-selective adsorption of linear cationic dye molecules via electrostatic attraction and steric discrimination, which are based on the anionic framework and methyl-induced pore confinement of the MOF. Its capacity to adsorb methylene blue is as high as 232.98 mg g^-1, surpassing that of the parent MOF. These results offer a robust strategy for targeted pollutant removal and guidance for the design of water-stable MOFs having multiple functions.