Conjugated triaryl triazine-incorporated, calix[4]pyrrole-based porous organic polymers for uptake iodine vapor and efficient adsorption of cationic dyes from water

Macrocycle-based porous organic polymers (M-POPs) are promising adsorbents for uptake of iodine vapor and adsorption of organic micropollutants (OMPs) from water. Herein, two conjugated triaryl triazine-incorporated, calix[4]pyrrole-based porous organic polymers were prepared by diazocoupling reaction between 4,4′,4′'-(1,3,5-triazine-2,4,6-triyl)trianiline (TTTA) and two configurational isomers of resorcinol-modified calix[4]pyrroles (2α,2β-C4P and 4α-C4P), referred as CP-POP-1 and CP-POP-2, respectively. The obtained CP-POPs were gifted with good porosity, high nitrogen contents and conjugated triaryl triazines, while CP-POP-1 and CP-POP-2 exhibited high iodine vapor uptake at 4.27 g/g and 4.25 g/g, respectively. Charge transfer interaction was the main mechanism for iodine vapor uptake on the CP-POPs. Besides, the CP-POPs displayed preferred adsorption feature to cationic dyes, such as methylene blue (MB), crystal violet (CV) and rhodamine B (RB), while CP-POP-2 showed superior adsorption performance towards cationic dyes. The q m values of MB, CV and RB by CP-POP-2 were as high as 317.46, 373.13 and 471.69 mg/g, respectively. Thermodynamic studies discovered that the adsorption of cationic dyes upon CP-POP-2 was a spontaneous process, while mechanism researches confirmed that electrostatic, hydrophobic and host-guest interactions were involved for adsorption of cationic dyes upon CP-POP-2. In addition, CP-POP-2 could adsorb cationic dyes efficiently from water samples containing complex matrix and exhibited good reusability. The obtained results suggested the bright prospect of the CP-POPs in removal of environmental pollutants. Download: Download high-res image (222KB) Download: Download full-size image