Effect of temperature on adsorption of U(Ⅵ) onto kaolin

Hong ZHANG; Yangchun LENG; Yanhui WANG; Jian LIU; Xianguo TUO

doi:10.11889/j.0253-3219.2018.hjs.41.070302

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Effect of temperature on adsorption of U(Ⅵ) onto kaolin

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

- Effect of temperature on adsorption of U(Ⅵ) onto kaolin
- NUCLEAR TECHNIQUES Vol. 41, Issue 7, Article number: 070302(2018)
- 作者机构：
  
  1.西南科技大学国防科技学院绵阳 621010
  2.四川理工学院化学与环境工程学院自贡 643000
- 作者简介：
- 基金信息：
- DOI：10.11889/j.0253-3219.2018.hjs.41.070302
  CLC： TL941
- Received：29 January 2018，
  
  Revised：30 March 2018，
  
  Published：10 July 2018
- 稿件说明：
移动端阅览
Hong ZHANG, Yangchun LENG, Yanhui WANG, et al. Effect of temperature on adsorption of U(Ⅵ) onto kaolin[J]. Nuclear techniques, 2018, 41(7): 070302
DOI：

Hong ZHANG, Yangchun LENG, Yanhui WANG, et al. Effect of temperature on adsorption of U(Ⅵ) onto kaolin[J]. Nuclear techniques, 2018, 41(7): 070302 DOI： 10.11889/j.0253-3219.2018.hjs.41.070302.

摘要

以高岭土为吸附剂，研究高岭土对水中U（Ⅵ）的吸附特征，对比探究了298.15 K、308.15 K、318.15 K和328.15 K下U（Ⅵ）的不同初始浓度、溶液pH和共存离子对其吸附的影响。吸附实验结果表明：随着U（Ⅵ）初始浓度增加，高岭土对U（Ⅵ）的吸附量增强，吸附热力学分析证明高岭土对U（Ⅵ）的吸附过程是自发的吸热过程，升温对高岭土吸附U（Ⅵ）产生促进作用；当pH为7时，高岭土对U（Ⅵ）的吸附效果最佳，相同pH条件下升温对高岭土吸附U（Ⅵ）产生促进作用；共存离子中Ca

、CO

和SO

对吸附有较大的抑制作用，相同离子条件下升温对高岭土吸附U（Ⅵ）产生促进作用；通过对不同温度条件下高岭土吸附前后的红外吸收光谱（Fourier Transform Infrared Spectrometer，FT-IR）对比发现：温度升高后吸收峰发生了移动和强度变化，并且有新峰出现，说明升温后高岭土对U（Ⅵ）的吸附不仅是物理吸附，还存在化学吸附。

Abstract

Background

The research on the disposal of clay rock in high-level waste is still in the initial stage

furthermore the research on the migration mechanism of nuclide in clay rock treatment system is weak.

Purpose

This study aims at the adsorption behavior of U(Ⅵ) onto kaolin

and provides reference for the safety evaluation system of high level waste disposal storehouse.

Methods

The effects of initial concentration of U(Ⅵ)

pH and coexisting ions on the adsorption of U(Ⅵ) onto kaolin are investigated at the temperatures of 298.15 K

308.15 K

318.15 K and 328.15 K.

Results

The results show that the adsorption of U(Ⅵ) onto kaolin is increasing with the increase of initial concentration of U(Ⅵ). At the same concentration of U(Ⅵ)

the adsorption of U(Ⅵ) onto kaolin is increasing with the increase of temperature. When the pH was 7

the adsorption of U (Ⅵ) onto kaolin is best. At the same pH

the adsorption of U(Ⅵ) onto kaolin is increasing with the increase of temperature. The coexistent ions Ca

and SO

have a greater inhibitory effect on the adsorption

at the same time the adsorption of U(Ⅵ) onto kaolin is increasing with the increase of temperature.

Conclusion

with the increase of temperature

the adsorption capacity of kaolin on U(Ⅵ) is enhanced. The adsorption thermodynamic analysis proves that the adsorption of U(Ⅵ) onto kaolin is a spontaneous endothermic process. Through comparison of fourier transform infrared spectrometer (FT-IR)

it is found that the absorption peaks have shifted and the intensity changes and appears a new peak

which proves that the adsorption of U(Ⅵ) onto kaolin is not only physical adsorption

there is also chemical adsorption.

关键词

Keywords

references

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