Nuclear Science and Techniques

《核技术》(英文版) ISSN 1001-8042 CN 31-1559/TL     2019 Impact factor 1.556

Nuclear Science and Techniques ›› 2007, Vol. 18 ›› Issue (5): 287 doi: 10.1016/S1001-8042(07)60063-3


Interaction between uranium and humic acid (I): Adsorption behaviors of U(VI) in soil humic acids

WEI Min1 LIAO Jiali1* LIU Ning1 ZHANG Dong2 KANG Houjun2 YANG Yuanyou1 YANG Yong JIN Jiannan1   

  1. 1 Key Laboratory of Radiation Physics and Technology (Sichuan University), Ministry of Education; Institute of Nuclear Science and Technology, Sichuan University, Chengdu 610064, China;
    2 Institute of Nuclear Physics and Chemistry, CAEP, Mianyang 621900, China
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WEI Min LIAO Jiali LIU Ning ZHANG Dong KANG Houjun YANG Yuanyou YANG Yong JIN Jiannan. Interaction between uranium and humic acid (I): Adsorption behaviors of U(VI) in soil humic acids.Nuclear Science and Techniques, 2007, 18(5): 287     doi: 10.1016/S1001-8042(07)60063-3

Abstract: The adsorption behaviors of uranium on three soil humic acids (HAs), which were extracted from soils of different depths at the same site, were investigated under various experimental conditions. The adsorption results showed that U(VI) in solutions can be adsorbed by the three soil HAs, with the order of FHA (HA from 5 m depth of soil) >SHA (HA from the surface) >THA (HA from 10 m depth of soil) for adsorption efficiency in each desirable condition, and the adsorption reached equilibrium in about 240 min. Although the maximum adsorption efficiency was achieved at a suitable uranium concentration (10 mg•L-1 U(VI) for SHA and THA, 20 mg•L-1 U(VI) for FHA), the adsorption could be described with Langmiur isotherm or Freundlich isotherm equation. The L/S (liquid/solid, mL/g) ratio and pH were important factors influencing the adsorption in our adsorption system besides uranium concentra-tion. The adsorption efficiency decreased with the increase of the L/S ratio and pH at the pH range of 2.0-3.0 for SHA and THA or 2.5-6.0 for FHA. However, no significant difference in adsorption of U(VI) was observed at the experi-mental temperature. All the results implied that humic substances have different characteristics in samples even col-lected at the same site.

Key words: Soil, Humic acid, Uranium, Extraction, Adsorption, Effect factors