γ辐照和热作用下硅基磷钼酸铵对Cs的吸附行为  

Effect of Gamma-Ray Irradiation and Thermal Aging on Adsorption Behavior of Cs by Porous Silica-Based Ammonium Molybdophosphate

作　　者：郭建锋 桑红吉 陈禾洲 吴艳[2] GUO Jian-feng;SANG Hong-ji;CHEN He-zhou;WU Yan(The 404 Company Limited,China National Nuclear Corporation,Jiayuguan 732850,China;School of Nuclear Science and Engineering,Shanghai Jiao Tong University,Shanghai 200240,China)

机构地区：[1]中核四0四有限公司,甘肃嘉峪关732850 [2]上海交通大学核科学与工程学院,上海200240

出　　处：《核化学与放射化学》2022年第5期533-541,I0003,共10页Journal of Nuclear and Radiochemistry

基　　金：国家自然科学基金资助项目(12175143)。

摘　　要：采用旋转蒸发减压法将磷钼酸铵(AMP)担载入多孔SiO_(2)中制备复合吸附剂,研究了其在^(60)Coγ辐照、温度、共存离子等条件下对Cs(Ⅰ)的吸附性能影响。结果表明:吸附剂粒径为90μm,平均孔径18 nm;400℃附近AMP发生明显的热解反应,(220)晶面的21.62°峰强减弱,同时检测到MoO_(3)的产生。γ辐照会引起部分AMP由晶相转变为非晶相,经计算在吸收100 kGy剂量后吸附剂是平均晶粒尺寸为383(1=0.1 nm)、边长为11.6的正方体晶胞,但辐照对Cs(Ⅰ)的饱和吸附容量和分配系数的影响较小。吸附剂在0.1~7.0 mol/L HNO_(3)的模拟废液中对Cs(Ⅰ)的吸附选择性强,吸附过程为离子交换、符合Langmuir吸附模型。For selective separation of 137 Cs from high level liquid wastes(HLLWs),a silica based ammonium molybdophosphate(AMP/SiO_(2))inorganic adsorbent was synthesized by combining the rotary vacuum evaporation method with pore crystallization.The effect ofγ-ray,temperature,coexisting ions on the adsorption performance toward Cs(Ⅰ),and chemical stability of AMP/SiO_(2) was also investigated.The adsorbent,with particle diameter of 90μm and pore size of 18 nm,has characteristics of nano materials.The obvious decomposition of the AMP/SiO_(2) occurres about 400℃resulted the decreasing of the(220)diffraction peak intensity and formation of MoO_(3).Gamma irradiation causes the transformation of some AMP from crystalline phase to amorphous phase and has less effect on adsorption capacity on Cs(Ⅰ).After 100 kGy absorbed dose,the average grain size of AMP is estimated to be 383A(1A=0.1 nm)and corresponds to be a cube cell with A11.6 side length.The AMP/SiO_(2) has relative high selectivity toward Cs(Ⅰ)in the range of 0.1-7.0 mol/L HNO_(3) simulated liquid waste,which follows Langmuir model and ion exchange process.

关 键 词：CS 磷钼酸铵 Γ辐照 吸附 

分 类 号：TL941.1[核科学技术—辐射防护及环境保护]