Pu在Ca-膨润土上的吸附  

Sorption Behavior of Pu on Ca-Bentonite

作　　者：章英杰[1] 苏锡光[1] 曾继述[1] 范显华[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》2006年第3期146-151,共6页Journal of Nuclear and Radiochemistry

摘　　要：以甘肃北山BS03井地下水为水相,研究了Pu在Ca-膨润土上的吸附行为。结果表明,Ca-膨润土对Pu具有较强的吸附能力,可用Freundlich吸附等温式描述;Pu在Ca-膨润土上的吸附为不可逆吸附;吸附平衡后,Pu在水相和固相中的价态主要为四价;随着溶液pH值和离子强度的升高,Pu的吸附能力增强;地下水中无机离子(包括阳离子和无机阴离子)浓度增大,有利于Ca-膨润土对Pu的吸附;地下水中DOC浓度增大,不利于Pu的吸附。The sorption behavior of Pu on Ca-bentonite is studied with batch experiment and 2 mol/L HClO4 is used to dissolve the Pu sorbed on Ca-bentonite at ambient temperature. The sorption experiments are performed under atmospheric and anaerobic conditions （in an argon glove box with an oxygen content of less than 5.0 × 10^- 6 mol/mol）. The experimental results show that the sorption ability of Pu on Ca-bentonite is increased with increasing pH value （3.0-10.0） of the aqueous phase and carbonate ion concentration（4.0 × 10^-3-1.0 × 10^- 1 mol/L） in the aqueous phase, and decreased with increasing DOC concentration in the aqueous phase. The oxygen concentration of the experimental condition has less influence on the sorption of Pu on Ca-bentonite. The sorption behavior of Pu on Ca-bentonite is irreversible. The sorption isotherms of Pu on Ca-bentonite can be well described by the Freundlich＇s equation.

关 键 词：PU Ca-膨润土 吸附 解吸 

分 类 号：O615.11[理学—无机化学]