Hydroxy‐Functionalized Hypercrosslinked Polymers (HCPs) as Dual Phase Radioactive Iodine Scavengers: Synergy of Porosity and Functionality

Abstract

Large-scale nuclear power plant production of iodine radionuclides ( 129 I, 131 I) pose huge threat in the events of nuclear disaster. Effective removal of radioiodine from nuclear waste is one of the most critical challenge because of the drawbacks of state-of-the-art adsorbents such as high cost, low uptake capacity and non-recyclability. Herein, two hydroxy-functionalized (-OH) hypercrosslinked polymers (HCPs), namely HCP-91 and HCP-92, have been synthesized and employed towards capture of iodine. High chemical stability along with synergistic harmony of high porosity and functionality of these materials makes them suitable candidates for capture of iodine from both vapor phase and water medium. Moreover, both the HCPs showed superior iodine removal performance from water in terms of fast kinetics and high removal efficiency (2.9 g g À 1 and 2.49 g g À 1 for HCP-91 and HCP-92 respectively). The role of functionality (-OH groups) and porosity has been established with the help of HCP-91, HCP-92 and non-functionalized biphenyl HCP for the efficient capture of I 3 ̄ions from water. In addition, both HCPs exhibited excellent selectivity and recyclability towards triiodide ions, rendering the potential of these materials towards real-time applications. Lastly, Density functional theoretical studies revealed key insights and corroborate well with the experimental findings.

Porous organic polymers (POPs) for environmental remediation

“…In another report from our group, demonstration of the role of the -OH group in synergy with porosity in the effective capture of iodine from both vapour phase and water medium has been explored by synthesizing three HCPs (HCP-91, HCP-92 and non-functionalized biphenyl HCP). 300 ), etc. as potential hazardous inorganic pollutants in wastewater on the priority list.…”

Construction of hydroxyl-functionalized hyper-crosslinked networks from polyimide for highly efficient iodine adsorption

“…synthesized two hydroxy-functionalized (-OH) hypercrosslinked polymers (HCPs) and demonstrated that the hydroxyl groups in the polymers can form H-bonding with iodine and triiodide ions which further enhanced the iodine removal efficiency from water. 36 Neeladri Das et al. reported a facile triptycene based hydroxyl Azo-nanoporous polymer and the presence of phenolic-OH in the polymer enable it effective for iodine capture (1.88 g g −1 ).…”

Highly Efficient Capture of Volatile Iodine by Conjugated Microporous Polymers Constructed Using Planar 3- and 4-Connected Organic Monomers

“…By far, adsorption is regarded as an effective strategy for radioiodine removal due to advantages such as easy operation, high efficiency, low cost, and so on. In recent years, various adsorbent materials have been developed for iodine capture, including inorganic zeolites [7,8], activated carbon [9,10], and silver-doped mordenite [11], as well as organic-inorganic hybrid materials (mainly referring to metal-organic frameworks, MOFs [12][13][14][15]), and organic porous framework materials such as covalent organic frameworks (COFs) [16][17][18][19][20], conjugated microporous polymers (CMPs) [21][22][23][24], porous aromatic frameworks (PAFs) [25][26][27], porous organic frameworks (POFs) [28], hyper crosslinked polymers (HCPs) [29,30], etc. Among them, organic porous framework materials appear to be one of the most effective adsorbents for iodine capture [5].…”