Nuclear Techniques

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Study on static adsorption kinetics of simulated uranium-bearing wastewater by geological specialty cement

LU Jiawei1, SU Wei2, XIE Hua1   

  1. 1. Fundamental Science on Nuclear Wastes and Environmental Safety Laboratory, Southwest University of Science and Technology, Mianyang 621010, China;
    2. Institute of Materials, China Academy of Engineering Physics, Jiangyou 621907, China
  • Received:2017-05-05 Revised:2017-06-28 Online:2017-09-10 Published:2017-09-06
  • Supported by:

    Supported by China Academy of Engineering Physics (No.16zx7127x), China Academy of Engineering Physics Foundation (No.FKY201402), Innovation Fund of Southwest University of Science and Technology (No.cx17-020)

Abstract:

Background: The cement medium is usually used to solidify the uranium-bearing wastewater, however, little attention was paid to adsorption capacity and mechanism of the cement powder in related search reports. Purpose: This study aims at the static adsorption behavior of geological special cement blank powder for uranium-bearing wastewater. Results: The results show that the adsorption equilibrium of static adsorption of geological special cement for uranium solution at different concentrations (20 mg·L-1, 30 mg·L-1 and 40 mg·L-1) was at 1.5 d. The maximal adsorption capacity (qe) was 40.257 mg·g-1, 60.423 mg·g-1 and 80.386 mg·g-1, respectively, and the final static equilibrium adsorption rate was up to 99.95% when the concentration of uranium solution was kept at 30 mg·L-1, the adsorption rate of geological special cement for U(VI) could reach 99.50% no matter the pH value of adsorption system changes among 5, 7 and 9. Conclusion: The geological special cement has a strong adsorption capacity for U(VI), and its adsorption effect is basically not affected by the concentration of uranium solution and the pH value. The pseudo secondary dynamical model can describe the whole adsorption process (t=0-41 d) well, and its correlation coefficient R2 is up to 99.99%, which demonstrates that the adsorption rate evolves according to the positive correlation relation with the square of the adsorption driving force (qe-qt).

Key words: Uranium-bearing wastewater, Geological special cement, Static adsorption, Dynamic model

CLC Number: 

  • TL941