硅基阴离子交换剂吸附Tc(Ⅶ)  

Adsorption of Tc(Ⅶ) From Nitric Acid Medium by Silica-Based Anion Exchanger

作　　者：孔彦荣[1] 贾永芬[1] 李辉波[1] 王孝荣[1] 王辉[1] 娄海林[1] 

机构地区：[1]中国原子能科学研究院放射化学研究所,北京102413

出　　处：《核化学与放射化学》2013年第6期359-363,共5页Journal of Nuclear and Radiochemistry

摘　　要：主要研究了硅基阴离子交换剂(以下简称SiR4N)在硝酸溶液中对Tc(Ⅶ)的吸附行为及其影响因素。结果表明,在0.50mol/L HNO3介质中,SiR4N对Tc(Ⅶ)的吸附分配系数为370mL/g,吸附平衡时间为35min;机理研究表明,Tc(Ⅶ)主要以TcO-4阴离子的形式被SiR4N吸附;SiR4N对Tc(Ⅶ)的吸附等温线基本符合Langmuir吸附等温线,属单分子层吸附,吸附热为-18.48kJ/mol;在0.50mol/L HNO3介质中SiR4N对Tc(Ⅶ)的静态饱和吸附量为0.30mmol/g(干)。The adsorption of Tc（Ⅶ） and its mechanism by the silica-based anion exchanger （SiR4N） were investigated in the aqueous solution of nitric acid.It is found that the adsorption mechanism of Tc（Ⅶ） on SiR4N accords with Langmuir isotherm,which means a monolayer adsorption.According to Clausius-Claperon equation,the adsorption heat ΔH is estimated to be-18.48 kJ/mol.When the concentration of nitric acid is 0.50 mol/L,the saturated adsorption of Tc（Ⅶ） on dry SiR4 N reaches 0.30 mmol/g at 25 ℃.

关 键 词：Tc(Ⅶ) SiR4N 阴离子交换 硝酸 

分 类 号：O647.316[理学—物理化学]