Nuclear Techniques ›› 2019, Vol. 42 ›› Issue (8): 80302-080302.doi: 10.11889/j.0253-3219.2019.hjs.42.080302

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

Study on adsorption properties of clay rock to uranium (VI)

Yuting ZHAO1,Yangchun LENG1(),Yanhui WANG1,Chunchun WEI1,Dongrui LI1,Xianguo TUO2   

  1. 1. College of National Defense Science and Technology, Southwest University of Science and Technology, Mianyang 621010, China
    2. School of Chemistry and Environmental Engineering, Sichuan University of Light Industry, Zigong 643000, China
  • Received:2019-03-25 Revised:2019-05-23 Online:2019-08-10 Published:2019-08-26
  • Contact: Yangchun LENG E-mail:yc@swust.edu.cn
  • About author:ZHAO Yuting, female, born in 1997, undergraduate in Southwest University of Science and Technology, major in radiation protection and nuclear safety, focusing on radionuclide migration
  • Supported by:
    National Natural Science Foundation of China(41630646)

Abstract: Background

Kaolin is one of clay rocks that can be used to adsorb uranium (VI), but performance has hardly studied.

Purpose

This study aims at the effects of adsorption time, initial U(VI) concentration, adsorption quality, pH value, ion species and humic acid quality on kaolin adsorption U(VI).

Methods

Kaolin 200 mesh, drying reserve, and formation of U(VI) solution with 1 g?L-1 mass concentration by U3O8 were prepared. Analytically pure reagents of known content were used to config deionized water and ionic solution with different pH values. Then, experimental method of static adsorption was used for the study.

Results

Kaolin has good adsorption performance for U(VI), and it reaches equilibrium at 6 h. The optimum concentration of U(VI) is 60 μg?mL-1. The best adsorbent mass is 0.01 g. When the pH value increases, the adsorption effect of kaolin on U(VI) increases first and then decreases, when pH=5, the adsorption effect is the greatest. In the solution, K+, NO3 -, Na+ and SO4 2- have little effect on the adsorption of U(VI). Mg2+, CO3 2- and HCO3 - have an inhibitory effect on the adsorption of U(VI), which is not conducive to adsorption. Increasing the quality of the humic acid in the solution inhibits the U(VI) adsorption of the kaolin.

Conclusions

The quasi-secondary kinetic model can better describe the adsorption of U(VI) on kaolin than the quasi-first-order kinetic model. This experiment provides a theoretical basis for kaolin as a backfill material for radioactive nuclear waste.

Key words: Kaolin, U(VI), Adsorption ability, Kinetic model

CLC Number: 

  • TL941