高等学校化学学报

高等学校化学学报 ›› 2010, Vol. 31 ›› Issue (8): 1510.

• 研究论文 • 上一篇    下一篇

土壤对外源钍的吸附行为表征

郭鹏然1,3, 贾晓宇2, 牟德海1, 仇荣亮3, 陈杭亭2   

  1. 1. 中国广州分析测试中心广东省分析测试技术公共实验室, 广州 510070;
    2. 中国科学院长春应用化学研究所国家电化学和光谱研究分析中心, 长春 130022;
    3. 中山大学环境科学与工程学院, 广州 510725
  • 收稿日期:2010-01-21 出版日期:2010-08-10 发布日期:2010-08-10
  • 通讯作者: 陈杭亭, 男, 博士, 研究员, 博士生导师, 从事痕量元素分析和钍元素环境化学行为研究. E-mail: htchen@ciac.jl.cn
  • 基金资助:

    国家自然科学基金(批准号: 20677057)和中国博士后科学基金(批准号: 20090450895)资助.

Characterization of Adsorption Behavior of Exogenous Thorium on Soil

GUO Peng-Ran1,3, JIA Xiao-Yu2, MU De-Hai1, QIU Rong-Liang3, CHEN Hang-Ting2*   

  1. 1. Guangdong Provincial Public Laboratory of Analysis and Testing Technology, China National Analytical Center(Guangzhou), Guangzhou 510070, China;
    2. National Analytical Research Center of Electrochemistry and Spectroscopy, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China;
    3. School of Environmental Science and Engineering, Sun Yat-Sen University, Guangzhou 510275, China
  • Received:2010-01-21 Online:2010-08-10 Published:2010-08-10
  • Contact: CHEN Hang-Ting. E-mail: htchen@ciac.jl.cn
  • Supported by:

    国家自然科学基金(批准号: 20677057)和中国博士后科学基金(批准号: 20090450895)资助.

PDF (PC)

被引次数

10

摘要： 外源钍对土壤的污染风险和程度取决于钍在土壤中的吸附行为. 以包头稀土工业区土壤样品和土壤环境矿物组分为研究对象, 通过静态吸附方法研究外源钍在土壤样品和环境矿物组分(高岭土、蒙脱土、碳酸钙、水合氧化铁/锰和腐殖酸)上的吸附, 并对吸附行为进行了表征. 结果表明, 土壤样品对外源钍有很强的吸附能力, 对加入的外源钍(10-4 mol/L)吸附率在97%以上; 土壤环境矿物组分对加入的外源钍(1 g/L)吸附率在28%～46%之间. 通过扫描电镜-能谱(SEM-EDS)分析可知, 外源钍进入土壤后与矿物组分发生相互作用, 可能形成了稳定化钙质钍碳酸盐和钍磷酸盐; 傅里叶变换红外光谱(FTIR)分析表明, 钍是与土壤环境矿物组分上的活性吸附位点发生相互作用而吸附并保持在土壤中, 是物理吸附和化学吸附共同作用的过程; X射线衍射分析(XRD)表明, 土壤在吸附钍前后, 其矿物组分基本相同, 而矿物晶体相态发生明显变化. 由于不同土壤矿物组分对钍的吸附方式不同, 导致吸附的钍以不同形态存在于土壤中.

关键词: 土壤, 钍, 吸附行为

Abstract: The risk and degree of harm of exogenous thorium to soil environment are depended on the adsorption behavior of thorium on soil. The adsorption of exogenous thorium on soil samples, collected from rare earth industrial park in Baotou, China, and mineral components(kaolin, montmorillonite, CaCO3, hydrous iron and manganese oxides, humic acid) were investigated by the static adsorption manner, and the adsorption behaviors were characterized by SEM, EDS, XRD and FTIR. The results show that the strong adsorption ability of exogenous thorium(10-4 mol/L) on soil samples was observed by high adsorption ratio of over 97%, however, the adsorption rate of soil mineral components to exogenous thorium(1 g/L) is in the range of 28%—46%. According to the results of SEM and EDS, exogenous thorium is adsorbed onto soil through working with soil mineral components, and likely formed the stable calcic thorium carbonate and thorium phosphate; and based on the results of FTIR, exogenous thorium is adsorbed onto soil by reacting with active adsorption sites of soil mineral components, which is the physical adsorption and chemical adsorption processes; and the results of XRD show that soil mineral components are not almost changed before and after adsorption of thorium on soil, but crystal phase states changes of soil minerals occurred. Owing to the different adsorption manners of soil mimeral components, the adsorbed thorium exists in soil as different fractions.

Key words: Soil, Thorium, Adsorption behavior

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