Multifunctional conjugated microporous polymers with pyridine unit for efficient iodine sequestration, exceptional tetracycline sensing and removal

Abstract

In this work, two multifunctional conjugated microporous polymers (CMP-LS7–8) were obtained via the Pd-catalyzed Suzuki coupling reactions of 2,4,6-tris(4-bromophenyl)pyridine with two aromatic borates. The Brunauer–Emmett–Teller (BET) surface areas of CMP-LS7–8 were calculated to be 507 and 2028 m2 g–1. CMP-LS7–8 exhibit excellent volatile iodine adsorption about 2.77 and 5.29 g g–1, respectively, and outstanding reversible adsorption. High adsorption capacity should be attributed to an integrated effect by excellent porous characteristics, effective sorption sites, and expanded π-conjugated network. In addition, this platform integrated two functions of sensing and adsorption of tetracycline (TC) into one material. The excellent luminescence of CMP-LS7–8 can be effectively quenched by TC, which demonstrates they can be acted as new sensitive and selective fluorescence probes toward TC. Simultaneously, CMP-LS7–8 also display high adsorption ability of TC. The adsorption kinetics of TC suggested that the process of adsorption followed a pseudo-second-order model, and the adsorption behaviour of these polymers fitted with the Langmuir model. These results suggest that CMP-LS7–8 posess high volatile iodine capture and exceptional TC detection and removal performance, which can be promising candidates for environmental remediation.