Crystal engineering of coordination-polymer-based iodine adsorbents using a π-electron-rich polycarboxylate aryl ether ligand

Abstract

The efficient capture and storage of radioactive iodine isotopes are important in nuclear waste treatment and environmental protection. Coordination polymers (CPs) are a family of newly emerging potential iodine absorbents....

Synthesis of thiophene‐based conjugated microporous polymers for high iodine and carbon dioxide capture

“…Compared with BTCMP‐2, BTCMP‐1 has a higher iodine capacity, which is due to the presence of fluoride moieties and relatively high pore volumes, thus increasing the iodine adsorption capacity of the sample. Although the thiophene‐based polymers BTCMP‐1 and BTCMP‐2 have low specific surface areas and pore volumes, the unique microscopic properties and electron‐rich groups of them in the network skeletons significantly increase the affinity between the polymers and gaseous iodine molecules, and improve the adsorption value, which makes them better at capturing iodine than those of some organic porous materials with high porosity, such as PAF‐1 ( S BET = 5600 m 2 /g, 186 wt%), 21 JUC‐Z2 ( S BET = 2081 m 2 /g, 144 wt%), 27 NIP‐CMP ( S BET = 2600 m 2 /g, 202 wt%), 28 CMPN‐3 ( S BET = 1368 m 2 /g, 208 wt%), 29 and so forth. These results indicated that the electron‐rich groups in the skeleton structures of the polymers were the main factors affecting the iodine adsorption value of the adsorbent.…”

“…Compared with monomers 3,3 0 ,5,5 0 -tetrabromo-2,2 0 -benzothiophene = 5600 m 2 /g, 186 wt%), 21 JUC-Z2 (S BET = 2081 m 2 /g, 144 wt%), 27 NIP-CMP (S BET = 2600 m 2 /g, 202 wt%), 28 CMPN-3 (S BET = 1368 m 2 /g, 208 wt%), 29 and so forth. These results indicated that the electron-rich groups in the skeleton structures of the polymers were the main factors affecting the iodine adsorption value of the adsorbent.…”

“…In view of the above characteristics, this material is very likely to be well applied to the enrichment and recovery of radioactive iodine in nuclear waste under complex environment, which is of great significance to the exploration in this field. In addition, the reported results show the iodine capture capacity of porous adsorbent materials can effectively improve by introducing the active sites with affinity for iodine (such as ionic bonds, benzene rings, triple bonds, π‐electron‐rich, nitrogen‐rich or sulfur‐rich heteroatom groups) into the network structure of CMPs 19–22 . Therefore, choosing building units with iodine affinity to construct CMPs can greatly improve the iodine absorption capacity of adsorbents.…”

“…In addition, the reported results show the iodine capture capacity of porous adsorbent materials can effectively improve by introducing the active sites with affinity for iodine (such as ionic bonds, benzene rings, triple bonds, π-electron-rich, nitrogen-rich or sulfur-rich heteroatom groups) into the network structure of CMPs. [19][20][21][22] Therefore, choosing building units with iodine affinity to construct CMPs can greatly improve the iodine absorption capacity of adsorbents.…”

Structure, Luminescent Sensing and Proton Conduction of a Boiling-Water-Stable Zn(II) Metal-Organic Framework

“…Both excitation and emission spectra of ligand H 2 BPD-4F4TS and ZnBPD-4F4TS were recorded in the solid state (Figure 3a,b). In the case of ligand H 2 BPD-4F4TS, it displays one fluorescent emission band centered at 535 nm when excited at 370 nm, which is probably assigned to π or n to π* orbital transitions [42,43]. After coordination to form ZnBPD-4F4TS, it shows a similar but blue-shifted emission peak at 518 nm when excited at 370 nm, showing a green emission of crystals (Figure 3c).…”