Study on Preparation and Radioactive Methyl-Iodine Adsorption Performance of TEDA Ionic Liquids

As the most important impregnation component of iodine adsorption materials, Triethylenediamine (TEDA) has a disadvantage of being volatile. This disadvantage has a negative impact on the adsorption performance of iodine adsorber, resulting in an increase in the operation cost of nuclear facilities and the amount of solid waste. Based on this problem, TEDA ionic liquids (TEDAILs) was prepared by quaternization of TEDA, which is a method to effectively solve the volatile problem of TEDA. The changes of the yield of TEDAILs and the proportion of single-cationic ionic liquids (SCILs) were investigated under different reactant ratio, reaction temperature and reaction time. According to the law of change, the optimal preparation condition of TEDAILs was revealed. In addition, the composition of the TEDAILs was analyzed by infrared spectrum and nuclear magnetic spectrum, and the thermal stability was also verified by thermogravimetric analysis. On this basis, TEDAILs loaded activated carbon fibers (TEDAILs-ACF) was designed and prepared, and the iodine adsorption performance was tested. Verification test results show that the complete decomposition temperature of TEDAILs is about 362 °C, which is about 187% higher than that of TEDA. Moreover, the adsorption efficiency of radioactive methyl iodine by TEDAILs-ACF under normal temperature and humidity is 99.94%. In summary, TEDAILs-ACF as radioactive methyl-iodine adsorption material has potential application prospect.