AUTHOR=Guan Heda , Zou Donglei , Yu Haiyang , Liu Meijun , Liu Zhi , Sun Wentian , Xu Feifan , Li Yangxue 

TITLE=Adsorption Behavior of Iodine by Novel Covalent Organic Polymers Constructed Through Heterostructural Mixed Linkers

JOURNAL=Frontiers in Materials

VOLUME=6

YEAR=2019

URL=https://www.frontiersin.org/journals/materials/articles/10.3389/fmats.2019.00012

DOI=10.3389/fmats.2019.00012

ISSN=2296-8016

ABSTRACT=<p>The efficient capture and storage radioactive iodine (<sup>129</sup>I or <sup>131</sup>I) formed during the extensive use of nuclear energy is of paramount importance. Therefore, it is a great deal to design and empolder new adsorbents for effectively disposing of iodine from nuclear waste. In this work, we presented a novel covalent organic polymer (JLUE-COP-3) constructed through heterostructural mixed linkers with perforated porousness, plenty of π-conjugated phenyl rings and functional –CO–NH– and –SO<sub>3</sub>H groups to iodine adsorption process. After fully characterizing the morphology and structure, the adsorption behavior of iodine by the resultant polymers were explored in detail. The external adsorption behavior was determined to obey the pseudo-second order kinetic model according to the kinetic analysis. The maximum liquid adsorption capacity was obtained to reach 153.85 mg/g at 298 K, which was evaluated by the Langmuir isotherm model. In addition, the negative attributes of Δ<italic>G</italic>° as well as the positive attributes of Δ<italic>H</italic>° and Δ<italic>S</italic>° at three temperatures indicated the nature of the iodine adsorption over JLUE-COP-3 was spontaneous and endothermic. The current study could look forward to making great contributions to the facile fabrication of late-model three-component POP materials and their applications in treatment of nuclear waste.</p>