羟基铁插层膨润土的制备及其对铀(VI)的吸附特性与机制

陈婧; 谢水波; 曾涛涛; 凌辉; 王亮

doi:10.13801/j.cnki.fhclxb.20160229.004

羟基铁插层膨润土的制备及其对铀(VI)的吸附特性与机制

陈婧¹,
谢水波^1,2,,
曾涛涛¹,
凌辉¹,
王亮¹

1.
南华大学污染控制与资源化技术湖南省高校重点实验室, 衡阳 421001;
2.
南华大学铀矿冶生物技术国防重点学科实验室, 衡阳 421001

基金项目: 国家自然科学基金（11175081，11475080）；高等学校博士点基金（20134324110003）；2015湖南省研究生科研创新项目（CX2015B405）

详细信息

通讯作者:
谢水波,博士,教授,博士生导师,研究方向为环境生物技术、水处理理论与技术。E-mail:xiesbmr@263.net

中图分类号: TB332
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出版历程
- 收稿日期: 2015-11-10
- 修回日期: 2016-02-21
- 刊出日期: 2016-11-14

Preparation of hydroxy-Fe intercalated bentonite and its adsorption characteristics and mechanism of uranium(VI)

1.
Hunan Province Key Laboratory of Pollution Control and Resources Reuse Technology, University of South China, Hengyang 421001, China;
2.
Key Discipline Laboratory for National Defence for Biotechnology in Uranium Mining and Hydrometallurgy, University of South China, Hengyang 421001, China

摘要

摘要: 通过羟基铁对钠基膨润土插层改性制备了羟基铁插层膨润土（OH-Fe-Bent），用于去除废水中的U（VI）。实验考察了pH值、U（VI）初始浓度、温度和吸附时间对OH-Fe-Bent吸附U（VI）效果的影响，并进行吸附动力学和热力学分析。采用FTIR、SEM、XRD等手段分析相关吸附机制。实验结果表明：OH-Fe-Bent吸附U（VI）的最佳pH为4，在温度为15℃，投加量为0.8 g/L，U（VI）初始浓度为10 mg/L时，OH-Fe-Bent对U（VI）的去除率达到99.55%，吸附平衡时间为90 min。Langmuir等温吸附模型和准二级动力学模型（相关系数的平方约为1）均可较好地拟合其吸附过程，理论饱和吸附量可达97.09 mg/g，OH-Fe-Bent对U（VI）是单分子层吸附。FTIR、SEM分析表明OH-Fe-Bent吸附U（VI）后自身结构没有改变，XRD分析表明羟基铁已经成功插入膨润土层间。
- 羟基铁 /
- 插层 /
- 膨润土 /
- 吸附 /
- 铀
Abstract: Hydroxyl Fe intercalated bentonite (OH-Fe-Bent) was prepared by Na-bentonite while using hydroxyl Fe as intercalated material. The synthesized OH-Fe-Bent composites applied to adsorb U(VI) from water solution. The effects of pH value, initial U(VI) concentration, temperature and contact time on adsorption of U(VI) for OH-Fe-Bent were experimentally determined, and the process of adsorption was investigated by kinetic and thermodynamic analysis. The corresponding adsorption mechanisms were analyzed by FTIR, SEM, and XRD etc. The experimental results indicate that the maximum adsorption capacity occurs at pH 4 and the removal rate of U(VI) for OH-Fe-Bent reaches 99.55% for initial U(VI) concentration of 10 mg/L and adsorbent dosage of 0.8 g/L at 15℃. Meanwhile the adsorption reaches equilibrium within 90 min. The adsorption process fits well with the Langmuir isotherm adsorption model and pseudo second-order kinetic model (square of correlation coefficient is about 1), and the theoretical saturated adsorption capacity is 97.09 mg/g, adsorption mechanism of U(VI) for OH-Fe-Bent is a monolayer adsorption. The FTIR and SEM analyses show that the structure of OH-Fe-Bent has no change after absorbing U(VI) and the XRD analysis shows that the hydroxyl Fe has already intercalated bentonite.
- hydroxyl Fe /
- intercalate /
- bentonite /
- adsorption /
- uranium

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