Functionalized Mn(II)-MOF based on host-guest interaction for selective and rapid capture of Congo red from water

Abstract A Mn(II)-based metal-organic framework (MOF) {[Mn 3 ( L 1 ) 2 ( L 2 ) 2 (H 2 O) 8 ]·4H 2 O} n ( 1 ) (H 3 L 1 = 6-sulfonaphthalene-1,4-dicarboxylic acid, L 2 = 1,3,5-tris(1 H -imidazol-1-yl)benzene), has been designed based on host-guest interaction. Single crystal X-ray diffraction indicated that 1 was a two-dimensional (2D) network with uncoordinated carboxyl and sulfo groups. The compound showed high selective adsorption of Congo red (CR) from water in two minutes. Moreover, the results also revealed that the maximum adsorption capacity of 1 can reach 1393 mg g −1 and 1 can be recovered conveniently.