The synthesis of 4,4'-methylenebis(cyclohexylamine)-based porous organic polymers via nucleophilic substitution reactions for uptaking iodine and fluorescence sensing to dinitrophenol

In order to achieve effective removal of radioactive iodine, trace detection of dinitrophenol (DNP), here, we have synthesized two porous organic polymers (POPs, TMCHA and HMCHA) by nucleophilic substitution reactions with specific surface areas of 1730 and 1796 m 2 g −1 , respectively. The adsorption capacities of POPs in iodine vapor and cyclohexane and the fluorescence sensing performances for DNP are studied. The results show that the adsorption capacities of TMCHA and HMCHA in iodine vapor are as high as 3.77 and 2.74 g g −1 , and the removal efficiencies of iodine in iodine-cyclohexane solution are 97% and 73%, respectively. The iodine adsorption mechanism of the MCHA-based POPs is the electron transfer mechanism. The Stern–Volmer quenching constants (Ksv) of TMCHA and HMCHA for fluorescence quenching of DNP are 4.04 × 10 3 and 4.42 × 10 3 L mol −1 , respectively. The fluorescence quenching of TMCHA and HMCHA was caused by FRET and PET together.