Carbazole-Bearing Porous Organic Polymers with a Mulberry-Like Morphology for Efficient Iodine Capture

Abstract

Three kinds of carbazole-based porous organic polymers were successfully prepared via simple Friedel−Crafts alkylation of 1,3,5-tri(9-carbazolyl)benzene. External cross-linking agents named 1,4-bis(chloromethyl)-benzene, cyanuric chloride, and 1,4-dimethoxybenzene were selected, and the derived polymers (denoted as CSU-CPOPs-1, CSU-CPOPs-2, and CSU-CPOPs-3) gave high surface areas (up to 1032 m 2 /g) and good stability. Interestingly, varying the nature of "knitting" agents led to an unprecedented morphology evolution, and it is worth noting that a mulberry-like morphology was observed for the case of 1,4bis(chloromethyl)-benzene. Taking advantage of the unique mulberry-like morphology as well as abundant porosity, CSU-CPOPs-1 showed ultrahigh iodine vapor adsorption performance with a capacity of 494 wt % at 348 K and 1 bar, which is the highest value reported to date for amorphous polymers. This study presented a feasible way to develop efficient iodine sorbents with tunable morphologies for addressing environmental issues.

Cationic Nonporous Macrocyclic Organic Compounds for Multimedia Iodine Capture

“…The demand of energy is increased rapidly with the development of social industrialization, nuclear energy as a green energy source is cleaner than fossil energy, it is more reliable, efficiency and less pollution. [1][2][3] However, radioactive wastes (e. g., 129 I, 3 H, 14 CO 2 , 85 Kr) generated from nuclear fission produce a series of effects on the natural environment as well as human health. [4,5] Among which, highly volatile radioactive iodinecontaining species can cause acute tissue damage and cancer.…”

The preparation of covalent triazine‐based framework via Friedel‐Crafts reaction of 2,4,6‐trichloro‐1,3,5‐triazine with N,N′‐diphenyl‐N,N′‐di(m‐tolyl)benzidine for capturing and sensing to iodine

“…As shown in the Fourier transform infrared (FT‐IR) spectrum of TDPDB (Figure S1), the stretching vibration peak of CCl at about 847 cm −1 disappeared compared with original TCT as a reference, suggesting that the polymerization reactions are complete . The weak bands at about 1485 (CN) and 1383 cm −1 (CN) belong to triazine unit . For further illustration of the connectivity and geometry of carbon atoms in the TDPDB structure was determined by solid‐state 13 C cross‐polarization magic‐angle spinning (CP/MAS) NMR (ss 13 C NMR) (Figure ).…”

“…TDPDB was polymerized of TCT with DPDB in o ‐dichlorobenzene in the presence of methanesulfonic acid at 140°C for 48 hours. The precipitate was separated by filtration, then it was washed with solvents and further extracted by Soxhlet apparatus . Although the nitrogen in DPDB may be protonated in the presence of CH 3 SO 3 H, which will significantly affect the directive effect of N atoms, the nitrogen protonation in the TPA derivatives was not as high as expected; hence, there is an excellent para‐directing effect under the catalysis of CH 3 SO 3 H .…”

High‐Yield Synthesis of Pyridyl Conjugated Microporous Polymer Networks with Large Surface Areas: From Molecular Iodine Capture to Metal‐Free Heterogeneous Catalysis

“…− species and polyiodide anions, i.e., I 5 − , respectively. [39] The I 3d XPS spectra of I 2 @PCMP-Y1, 5, and 7 show two couples of peaks at 630.9 and 619.5 eV assigned for I 5…”

“…After iodine adsorption, Raman spectra of I 2 @PCMP‐Y show a typical “V‐shape” bands at ≈107 and ≈166 cm −1 (Figure 6b), which are assigned to the symmetric stretching mode of I 3 − species and polyiodide anions, i.e., I 5 − , respectively. [ 39 ] The I 3d XPS spectra of I 2 @PCMP‐Y1, 5, and 7 show two couples of peaks at 630.9 and 619.5 eV assigned for I 5 − and 629.8 and 618.3 eV assigned for I 3 − . [ 40 ] Interestingly, the N1s core‐level XPS spectra of I 2 @PCMP‐Y present a peak at ≈401.1 eV attribute to quaternary ammonium cation (N + ) came from pyridine (Figure 6c,d).…”