Nuclear Techniques ›› 2019, Vol. 42 ›› Issue (6): 60301-060301.doi: 10.11889/j.0253-3219.2019.hjs.42.060301

• NUCLEAR CHEMISTRY, RADIOCHEMISTRY, RADIOPHARMACEUTICALS AND NUCLEAR MEDICINE • Previous Articles     Next Articles

Study of adsorption characteristic of uranium(VI) on clay colloid

Yiting SONG,Yangchun LENG(),Junwen HUANG,Dongrui LI   

  1. Key Subject Laboratory of National Defense for Radioactive Waste and Environmental Security, Southwest University, Mianyang 621010, China
  • Received:2019-03-22 Revised:2019-04-16 Online:2019-06-10 Published:2019-06-18
  • Contact: Yangchun LENG E-mail:leng_yc@swust.edu.cn
  • About author:SONG Yiting, female, born in 1996, studying at Southwest University of Science and Technology, major in nuclear chemical engineering and nuclear fuel engineering, focusing on nuclide migration
  • Supported by:
    Sichuan University Students Innovation and Entrepreneurship Training Project (No.201710619074), Key Program of National Natural Science Foundation of China (No.41630646), Youth Fund of National Natural Science Foundation of China(No.41603124)

Abstract: Background

At present, the study of surrounding rocks for high-level radioactive waste disposal is mostly clay rock minerals, but little attention has been paid to the migration mechanism of nuclide related to clay colloid.

Purpose

This study aims at the adsorption behavior of U(VI) on clay colloid and analysis of the adsorption mechanism of clay colloid on U(Ⅵ).

Methods

The static adsorption method was used to evaluate the adsorption capacity of clay colloid for uranium by the adsorption partition coefficient K d. Effects of initial Uranium concentration, pH value and ion species on adsorption behavior of clay rock colloids were investigated..

Results

The results showed that the optimum of adsorption initial concentration is 3 μg·mL?1. When the pH value is less than 8, the partition coefficient increases, and when the pH is 8, the sorption of U(Ⅵ) on clay colliod reaches the maximum value. To a certain extent, the adsorption of U(VI) in clay rock colloids was inhibited by anions and cations, among which Ca2+, HCO3 ?, CO3 2? have strong inhibition effect.

Conclusions

The adsorption isotherms of U(Ⅵ) on clay colloid were well fitted by the Freundlich isotherm equation. Fourier transform infrared spectroscopy (FT-IR) indicates that the main groups before and after adsorption are hydroxyl groups.Key words Clay colloid, Adsorption, Uranium(Ⅵ), Thermodynamics

CLC Number: 

  • TL941