title: Experiment and DFT studies on radioiodine removal and storage mechanism by imidazolium-based ionic liquid.
abstract: In order to remove and store radioactive substances effectively, studies on the mechanisms of radioiodine captured by ionic liquids (ILs) with a fixed cation (1-butyl-3-methyl-imidazolium cation [Bmim]+) were carried out in experimental and theoretical methods. Fourier transform infrared attenuated total reflectance (FT-IR ATR) spectra of 2BP8HQ and ultraviolet-visible (UV/vis) spectroscopy were used to investigate the kinetic process of radioiodine removal by ILs in experiment. Corresponding theoretical investigations on the structures and formation mechanisms of ILs, bare anions and complexes as well as hydrogen bonds was carried using density functional theory. The electrostatic potential was used in configuration design and construction. Charge distribution was used to show the variation of atom charge density, Interaction energy and vibration frequency change were performed to explore possible mechanisms on the halogen bond formation between radioiodine molecule and bare anion or anion in ILs when radioiodine captured by ILs. In order to characterize halogen bonds both natural bond orbital analysis and atoms in molecules analysis were performed. Both experimental and computational results showed that radioiodine could be captured by ILs with a 1:1mol stoichiometry. It was noteworthy that [Bmim][Br], [Bmim][I] and [Bmim][Cl], containing high radioiodine capture efficiency anions, were better candidates in removal and reliable storage of radioiodine for their capture efficiencies of over 80% in 5h.
authors.affiliation: School of Chemistry and Chemical Engineering, Qufu Normal University, Qufu, Shandong 273165, China.
authors.forename: Bobo
authors.initials: B
authors.lastname: Cao
authors.affiliation: School of Chemistry and Chemical Engineering, Qufu Normal University, Qufu, Shandong 273165, China.
authors.forename: Shuangyue
authors.initials: S
authors.lastname: Liu
authors.affiliation: School of Chemistry and Chemical Engineering, Qufu Normal University, Qufu, Shandong 273165, China.
authors.forename: Dongmei
authors.initials: D
authors.lastname: Du
authors.affiliation: College of Materials Science and Technology, Beijing Forestry University, Beijing 100083, China. Electronic address: zmxue@bjfu.edu.cn.
authors.forename: Zhimin
authors.initials: Z
authors.lastname: Xue
authors.affiliation: State Key laboratory of Heavy Oil Processing, College of Science, China University of Petroleum, Shandong, Qingdao 266580, China. Electronic address: fuhui@upc.edu.cn.
authors.forename: Hui
authors.initials: H
authors.lastname: Fu
authors.affiliation: School of Chemistry and Chemical Engineering, Qufu Normal University, Qufu, Shandong 273165, China. Electronic address: sunhaitao1960@126.com.
authors.forename: Haitao
authors.initials: H
authors.lastname: Sun
mesh_terms: D002412:Cations; D006219:Halogens / Q000737:chemistry; D007093:Imidazoles / Q000737:chemistry*; D007457:Iodine Radioisotopes / Q000737:chemistry*; D052578:Ionic Liquids / Q000737:chemistry*; D007700:Kinetics; D008962:Models, Theoretical; D013056:Spectrophotometry, Ultraviolet; D017550:Spectroscopy, Fourier Transform Infrared; D055672:Static Electricity
chemical_list: D002412:Cations; D006219:Halogens; D007093:Imidazoles; D007457:Iodine Radioisotopes; D052578:Ionic Liquids; C029899:imidazole
keywords: DFT; FT-IR ATR; Halogen bonds; Ionic liquid; Radioiodine; Reaction Mechanism; UV/vis