三乙烯二胺改性活性炭纤维对气态甲基碘吸附研究  

Adsorptive Removal of Gaseous Methyl Iodide by Triethylenediamine Modified Activated Carbon Fiber

作　　者：王烈林[1] 刘峰 詹杰 苏兴东 陈小江 李利 周美灵 邹浩[1] 丁聪聪 谢华[1] WANG Lielin;LIU Feng;ZHAN Jie;SU Xingdong;CHEN Xiaojiang;LI Li;ZHOU Meiling;ZOU Hao;DING Congcong;XIE Hua(Fundamental Science on Nuclear Wastes and Environmental Safety Laboratory,Southwest University of Science and Technology,Mianyang 621010,China;China Nuclear Power Technology Research Institute Co.,Ltd.,Shenzhen 518028,China)

机构地区：[1]西南科技大学核废物与环境安全国防重点学科实验室,四川绵阳621010 [2]中广核研究院有限公司,广东深圳518028

出　　处：《原子能科学技术》2023年第9期1800-1809,共10页Atomic Energy Science and Technology

基　　金：国家自然科学基金(21101129,41502028);深圳市科技创新委员会技术攻关重点项目(JSGG20200924171000001);四川省自然科学基金(2022NSFSC0252)。

摘　　要：气态甲基碘是核设施运行过程中难以处理的放射性气态产物之一。本文通过水热法制备了三乙烯二胺(TEDA)改性高比表面积粘胶基活性炭纤维材料,并开展了改性材料气态甲基碘吸附研究,通过BET、SEM-EDS、FT-IR、TGA、放射性测试方法对材料进行了表征和吸附性能分析。静态气态碘吸附结果表明,水热改性材料对单质碘吸附量提高了36%,达到1.84 g/g,甲基碘吸附量达到400 mg/g。甲基碘动态吸附实验表明,改性材料具有较高的吸附效率;随着温度和湿度的增加,吸附效率略有降低;环境湿度对气态甲基碘的吸附性能影响较大。温度30℃、相对湿度95%条件下的穿透测试表明,材料在12 h内未出现穿透,改性材料展现出优异的甲基碘吸附性能。放射性甲基碘吸附实验显示,水热改性材料吸附效率接近95%,超过未改性材料的3倍;TEDA改性活性炭纤维明显提高了对气态甲基碘的化学吸附能力。水热法TEDA改性粘胶基活性炭纤维材料表现出优异气态甲基碘吸附性能。The rapid growth of the nuclear industry poses a great challenge for radioactive waste treatment.Volatile radioactive isotopes generated from uranium fission,especially gaseous iodine,attracted great attention due to their environment and health hazards.The widespread species of radioactive iodine are gaseous elemental iodine(I 2)and methyl iodide(CH 3I).It is difficult to trap the methyl iodide in high humid condition.Activated carbon and derivative materials are widely used as adsorbents to remove volatile iodine.Triethylenediamine(TEDA)is proposed as impregnation via isotope exchange mechanism.In this study,activated carbon fiber(ACF)with high surface area,heat resistant and chemically stable was used as substrate,TEDA-modified viscose-based activated carbon fiber was prepared by hydrothermal reaction.For fiber hydrothermal modified with 5%(mass fraction)TEDA,the surface area and pore volume decrease about 20%.Compared with conventional impregnation,more TEDA impregnation enters into the microporous structure of activated carbon fibers under hydrothermal environment.The gaseous iodine adsorption properties of modified activated carbon fiber were investigated.Static adsorption experiments of elemental iodine and methyl iodide were performed.The adsorption capacity of elemental iodine and methyl iodide increases by 36% and 50% respectively.Methyl iodide adsorption capacity of hydrothermal modified-ACF is 400 mg/g.The dynamic adsorption experiments show that the adsorption performance of modified activated carbon fiber for methyl iodine decreases with the increase of temperature and humidity.The adsorption performance of activated carbon fiber for methyl iodine is greatly affected by environmental humidity.Breakthrough experiment with 5 ppm of gaseous methyl iodide was conducted under high humid conditions(30℃,RH 95%),the feed gas flow rate was fixed at 15 L/min for 12 h.Breakthrough curve indicates that hydrothermal modified-ACF has good adsorption performance with respect to methyl iodide.The radioactive CH 3

关 键 词：活性炭纤维 水热法 气态甲基碘 放射性甲基碘 吸附效率 

分 类 号：TL75[核科学技术—辐射防护及环境保护]