EXAFS study influence of pH on microscopic structure of zinc

LI Xianliang~

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EXAFS study influence of pH on microscopic structure of zinc

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- EXAFS study influence of pH on microscopic structure of zinc
- NUCLEAR TECHNIQUES Issue 12, (2004)
- 作者机构：
  
  1. 中国科学院生态环境研究中心环境水化学国家重点实验室
  2. 中国科学院高能物理研究所同步辐射室
  3. 中国科学院高能物理研究所同步辐射室北京 100085 重庆出入境检验检疫局技术中心,重庆,400020
  4. ,北京,100049
- 作者简介：
- 基金信息：
  
  中科院“百人”计划;国家自然科学基金(批准号:20073060)
- DOI：
  CLC： O614.241
- Published：01 December 2004
- 稿件说明：
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[1]李贤良,潘纲,朱孟强,陈灏,胡天斗,吴白玉,谢亚宁,杜永华.用EXAFS研究pH对水溶液中Zn(Ⅱ)微观结构的影响[J].核技术,2004(12):895-898.

LI Xianliang~. EXAFS study influence of pH on microscopic structure of zinc[J]. Nuclear techniques, 2004, (12): 895-898.
[1]李贤良,潘纲,朱孟强,陈灏,胡天斗,吴白玉,谢亚宁,杜永华.用EXAFS研究pH对水溶液中Zn(Ⅱ)微观结构的影响[J].核技术,2004(12):895-898. DOI：

LI Xianliang~. EXAFS study influence of pH on microscopic structure of zinc[J]. Nuclear techniques, 2004, (12): 895-898. DOI：

摘要

用扩展X射线吸收精细结构光谱（EXAFS）研究了溶液中重金属Zn（Ⅱ）在不同pH条件下的微观结构。在酸性条件下（pH<7.0）

锌离子以六配位八面体结构的水合离子存在

Zn-O原子平均间距为2.08A。随着pH升高

Zn（Ⅱ）的微观构型从六配位的八面体结构转变为四配位的四面体结构

Zn-O原子间距为1.96A。EXAFS结果从分子水平表明

Zn（Ⅱ）在不同pH下其存在形式和微观结构不一样。这些微观结构信息对研究不同pH环境下Zn在颗粒物—水界面和溶液中的反应有重要意义。

Abstract

Microscopic local structures of Zn（Ⅱ） were studied using extended X-ray absorption fine structure （EXAFS） spectroscopy under different pH conditions. When pH

7.0

（aq） was coordinated with six water molecules and the average Zn-O distance was measured to be 2.08A

which indicated that hydrated Zn

（aq） ions were in octahedral geometry under acid conditions. Under alkaline conditions

（aq） was coordinated with four water molecules and the average Zn-O distance was measured to be 1.96A

which indicated that hydrated Zn

（aq） ions were in tetrahedral geometry. EXAFS results provided detailed information on the form and microscopic structure of hydrated Zn（Ⅱ） ions under different pH conditions

which were fundamental for understanding the reactivity of Zn（Ⅱ） in solutions and at particle-water interfaces.

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