Computational simulation of the speciation distribution of uranium in Beishan groundwater and the sorption of uranium on two different materials

Wanqiang ZHOU; Jingcheng JIANG; Jiangang HE; Xiangyun WANG; Liang DU; Xiaoli WANG; Zhaoyi TAN; Chunli LIU

doi:10.11889/j.0253-3219.2018.hjs.41.070301

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Computational simulation of the speciation distribution of uranium in Beishan groundwater and the sorption of uranium on two different materials

NUCLEAR CHEMISTRY, RADIOCHEMISTRY, RADIOPHARMACEUTICALS AND NUCLEAR MEDICINE | 更新时间：2021-05-19

- Computational simulation of the speciation distribution of uranium in Beishan groundwater and the sorption of uranium on two different materials
- NUCLEAR TECHNIQUES Vol. 41, Issue 7, Article number: 070301(2018)
- 作者机构：
  
  1.北京分子科学国家实验室放射化学与辐射化学重点学科实验室北京大学化学与分子工程学院北京 100871
  2.环境保护部固体废物与化学品管理技术中心北京 100029
  3.中国工程物理研究院核物理与化学研究所绵阳 621900
- 作者简介：
- 基金信息：
  
  National Natural Science Foundation of China;National Natural Science Foundation of China;National Natural Science Foundation of China;National Natural Science Foundation of China;the State Administration of Science Technology and Industry for National Defence
- DOI：10.11889/j.0253-3219.2018.hjs.41.070301
  CLC： TL942.1
- Received：01 March 2017，
  
  Revised：16 September 2017，
  
  Published：10 July 2018
- 稿件说明：
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Wanqiang ZHOU, Jingcheng JIANG, Jiangang HE, et al. Computational simulation of the speciation distribution of uranium in Beishan groundwater and the sorption of uranium on two different materials[J]. Nuclear techniques, 2018, 41(7): 070301
DOI：

Wanqiang ZHOU, Jingcheng JIANG, Jiangang HE, et al. Computational simulation of the speciation distribution of uranium in Beishan groundwater and the sorption of uranium on two different materials[J]. Nuclear techniques, 2018, 41(7): 070301 DOI： 10.11889/j.0253-3219.2018.hjs.41.070301.

摘要

为了解铀在北山地下水的存在种态和吸附行为，利用CHEMSPEC软件计算了铀在北山地下水的种态分布及其在石英和水合氧化铁两种材料上的吸附，并考察了pH、Eh和不同离子浓度的变化对铀种态分布的影响。结果显示：在酸性条件下，铀主要以U（OH）

（aq）形式存在；在中性和弱碱性条件下，主要以UO

（CO

）

和UO

（CO

）

形式存在；在强碱性条件下，主要以UO

（OH）

形式存在。U的价态受电位影响较大，在还原条件下，U（Ⅳ）较稳定，在氧化条件下，U（Ⅵ）较稳定。不同离子的引入会影响U的种态分布，其影响大小顺序为HCO

。U（Ⅵ）在石英上的吸附随pH同步增大，并在pH=4.3处达到最大值，U（Ⅵ）在水合氧化铁的吸附随pH增大而先增大后减小，pH在5.7~8.2内达到最大值。

Abstract

Background

The disposal of high-level radioactive wastes is critical for sustainable development of nuclear energy. And the adsorption

diffusion and migration behaviors of radionuclides in the environment depend on the chemical species in the system.

Purpose

The paper aims to understand the speciation distribution of uranium and adsorption behavior on quartz and hydrous ferric oxide.

Methods

The speciation distribution and sorption of uranium are calculated by chemical speciation analysis software CHEMSPEC

which is developed by Peking University Nuclear Environmental Group.

Results and Conclusions

The calculation results indicate that uranium exists as UO

(CO

)

and UO

(CO

)

in the Beishan groundwater. And under acidic conditions

uranium mainly exists as U(OH)

(aq). While in neutral or weak alkaline conditions

the main species are UO

(CO

)

and UO

(CO

)

. When the solution is in strong alkaline conditions

most of uranium exists as UO

(OH)

. And U(Ⅳ) is stable in the redox condition

while U(Ⅵ) is stable in the oxide condition. The concentration of different ions also has influence on the speciation distribution of uranium

and in the order of HCO-3

. With the increasing number of pH

the sorption extent of U(Ⅵ) on quartz is lager. And the maximum adsorption is at pH=4.3. When it comes to U(Ⅵ) sorption on hydrous iron oxide

the greatest sorption is at pH=5.7~8.2.

关键词

Keywords

references

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