Nuclear Techniques ›› 2020, Vol. 43 ›› Issue (1): 10301-010301.doi: 10.11889/j.0253-3219.2020.hjs.43.010301

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

Study on the adsorption of U(VI) by activated-carbon activated by H2O2

Qingfeng WEI1,Yanming SHI2,Tongtong LI2,Xianguo TUO3(),Yanhui WANG1   

  1. 1. Laboratory of National Defense for Radioactive Waste and Environmental Security, Southwest University of Science and Technology, Mianyang 621010, China
    2. China Nuclear Power Engineering Co. , Ltd. , Shenzhen 518000, China
    3. Sichuan University of Science & Engineering, Zigong 643033, China
  • Received:2019-05-13 Revised:2019-11-18 Online:2020-01-15 Published:2020-01-21
  • Contact: Xianguo TUO E-mail:tuoxg@cdut.edu.cn
  • About author:WEI Qingfeng, male, born in 1994, graduated from Southwest University of Science and Technology in 2017, master student, focusing on nuclide migration
  • Supported by:
    National Natural Science Foundation of China(41630646)

Abstract: Background

Uranium pollution to water environment is becoming more and more serious. U(VI) has become the main research object because of its special physical and chemical properties. Although ordinary activated carbon is easy to obtain and cheap, its adsorption properties for U(VI) need to be improved.

Purpose

This study aims to improve the adsorption performance of activated carbon for U(VI) by clean and harmless hydrogen peroxide.

Methods

The activated carbon before and after activation was characterized by Fourier transform infrared spectroscopy (FT-IR), thermogravimetric analysis (TGA), scanning electron microscope (SEM) and Brunauer-Emmett-Teller (BET) theory. The mechanism of activated carbon activated by hydrogen peroxide was investigated. The sorption behavior of U(VI) on activated-carbon was studied as a function of contact time, pH value, solid-to-liquid ratio, initial concentration, temperature and ionic species of U(VI) by the static experimental method.

Results

The results showed that the oxidized groups on the surface of the treated activated carbon increased, and more adsorption sites were formed. The specific surface area decreased slightly whereas the mesoporous content and porosity increased. Under the optimal conditions (contact time, pH, solid-liquid ratio, initial concentration, temperature were 90 min, 5, 8 g·L-1, 80 mg·L-1, 35 ℃, respectively), the adsorption performance was improved by 68%. The quasi second-order kinetic model and Langmuir isotherm adsorption model fitted the adsorption behavior well, and the adsorption behavior was homogeneous and multi-element. 15%-AC still had good adsorption performance under the influence of coexisting ions and cyclic adsorption.

Conclusions

Experiments show that the activation process of H2O2 can effectively improve the adsorption of U(Ⅵ) on activated carbon.

Key words: Activated-carbon, Hydrogen peroxide, Activation, Adsorption, U(VI)

CLC Number: 

  • TL941