物理化学学报 >> 2011, Vol. 27 >> Issue (09): 2222-2226.doi: 10.3866/PKU.WHXB20110918

催化和表面科学 上一篇    下一篇

Se(IV)在北山花岗岩上的吸附

郭治军1,2, 陈宗元2, 吴王锁2, 刘春立1, 陈涛1, 田文宇1, 黎春1   

  1. 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. 兰州大学核科学与技术学院, 兰州730000
  • 收稿日期:2011-04-12 修回日期:2011-06-08 发布日期:2011-08-26
  • 通讯作者: 刘春立 E-mail:liucl@pku.edu.cn
  • 基金资助:

    国家自然科学基金(10775008, 11075006，91026010，20971061), 教育部博士点基金(20060001032), 国防科工委军工遗留专项基金(科工计[2007]840), 中央高校基本科研业务费专项资金和北京大学测试基金(第16-18 期)资助项目

Adsorption of Se(IV) onto Beishan Granite

GUO Zhi-Jun1,2, CHEN Zong-Yuan2, WU Wang-Suo2, LIU Chun-Li1, CHEN Tao1, TIAN Wen-Yu1, LI Chun1   

  1. 1. Beijing National Laboratory for Molecular Sciences, Radiochemistry & Radiation Chemistry Key Laboratory for Fundamental Science, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, P. R. China;
    2. School of Nuclear Science and Technology, Lanzhou University, Lanzhou 730000, P. R. China
  • Received:2011-04-12 Revised:2011-06-08 Published:2011-08-26
  • Contact: LIU Chun-Li E-mail:liucl@pku.edu.cn
  • Supported by:

    The project was supported by the National Natural Science Foundation of China (10775008, 11075006,91026010，20971061), Research Fund for Ph. D Program of the Ministry of Education, China (20060001032), Special Foundation for High LevelWaste Disposal, China (2007-840), Fundamental Research Funds for the Central Universities, China, Analysis Foundation (16-18) of Peking University, China.

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摘要： 采用批式法研究了粉碎的甘肃北山花岗岩样品(BS03, 600 m)对Se(IV)的吸附作用. 实验结果表明: 在pH 3-7 范围内, Se(IV)的吸附分配比(Kd)基本不随pH变化; 当pH > 7 时, Se(IV)在北山花岗岩上的Kd随pH的增大而减小. Se(IV)在北山花岗岩上的吸附不随离子强度变化. 北山地下水条件下的Ca2+(4.10×10-3 mol·L-1)和SO42- (3.17×10-3 mol·L-1)对Se(IV)的吸附没有影响. 此外, Se(IV)/Eu(III)/北山花岗岩三元吸附体系的实验结果表明, Se(IV) (1.46×10-5 mol·L-1)和Eu(III) (3.33×10-6 mol·L-1)在北山花岗岩上的吸附作用相互之间没有表观影响. 通过假定HSeO3-在广义的吸附位点≡SOH上发生了生成≡SHSeO3和≡SSeO3-的两个表面配位反应, 定量解释了Se(IV)的吸附实验结果.

关键词: 北山花岗岩, 吸附, Se(IV), 表面配位模型

Abstract: The adsorption of Se(IV) onto crushed Beishan granite (BS03, 600 m) was studied by a batch experimental method. The results showed that the distribution coefficient (Kd) remained almost constant in the pH range of 3-7 and decreased at pH>7. The adsorption of Se(IV) did not vary with ionic strength. The presence of Ca2+ (4.10×10-3 mol·L-1) and SO42- (3.17×10-3 mol·L-1) had no effect on Se(IV) adsorption. Moreover, we found that the adsorption of Se(IV) (1.46×10-5 mol·L-1) and Eu(III) (3.33×10-6 mol·L-1) on Beishan granite had no effect on each other in the ternary adsorption system consisting of Se(IV)/Eu(III)/ granite. The adsorption of Se(IV) onto Beishan granite was quantitatively interpreted by considering the two surface complexation reactions of HseO3- to form ≡SHSeO3 and ≡SSeO3- on the ≡SOH general adsorption sites.

Key words: Beishan granite, Adsorption, Selenium(IV), Surface complexation model