Zhang Qian, Gao Yangyang, Xu Zhanglian, Wang Sheng, Kobayashi Hisayoshi, Wang Jie
Shaanxi Key Laboratory of Advanced Nuclear Energy and Technology, and Shaanxi Engineering Research Center of Advanced Nuclear Energy, School of Nuclear Science and Technology, Xi'an Jiaotong University, Xi'an 710049, China.
Department of Chemistry and Materials Technology, Kyoto Institute of Technology, Matsugasaju, Sakyo-ku, Kyoto 606-8585, Japan.
Materials (Basel). 2020 Dec 17;13(24):5770. doi: 10.3390/ma13245770.
Oxygen-containing functional groups tend to induce a strong interaction between solid adsorbents and iodine molecules, yet have not been systematically investigated. Herein, on the basis of a series of nitric acid-treated graphene oxide (GO) with different contents of oxygen functional groups for iodine adsorption, it was found that the iodine uptake capacity is proportionate to the oxygen content and the diversities of oxygen-containing groups. The density functional theory (DFT) calculation results also suggest that oxygen-containing groups result in strong interactions between iodine molecules and the adsorbents through a covalent bond-forming process, among which -OH groups possess a higher adsorption energy averagely. Such theoretical and experimental work deepens our understanding of the effects of oxygen functional groups on iodine adsorption and provides novel ideas for future design and synthesis of high-performance solid adsorbents for radioactive iodine.
含氧官能团往往会在固体吸附剂和碘分子之间引发强烈的相互作用，但尚未得到系统研究。在此，基于一系列经硝酸处理且具有不同氧官能团含量的氧化石墨烯（GO）用于碘吸附的研究，发现碘吸附量与氧含量以及含氧官能团的多样性成正比。密度泛函理论（DFT）计算结果还表明，含氧官能团通过形成共价键的过程导致碘分子与吸附剂之间产生强烈相互作用，其中-OH基团平均具有更高的吸附能。此类理论和实验工作加深了我们对氧官能团对碘吸附影响的理解，并为未来设计和合成用于放射性碘的高性能固体吸附剂提供了新思路。
