放射性核素<sup>63</sup>Ni(Ⅱ)在膨润土上的吸附

陈亮; 于少明; 胡君

放射性核素⁶³Ni(Ⅱ)在膨润土上的吸附

1.
合肥工业大学化工学院,安徽合肥230009
2.
中国科学院等离子体物理研究所,安徽合肥230031

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出版历程
- 收稿日期: 1899-12-31
- 修回日期: 1899-12-31
- 刊出日期: 2012-12-19

Sorption of Radionuclide ⁶³Ni(Ⅱ) on Bentonite

1.
School of Chemical Engineering, Hefei University of Technology, Hefei 230009, China
2.
Institute of Plasma, Chinese Academy of Science, Hefei 230031, China

摘要

摘要: 通过傅立叶变换红外光谱(FTIR)、X射线衍射(XRD)、扫描电子显微镜(SEM)等测试手段对膨润土的物相组成、微观形貌特征等进行了表征。采用静态批式法研究了膨润土对溶液中⁶³Ni(Ⅱ)的去除效果，考察了吸附时间、pH以及共存阳离子等因素对其吸附性能的影响。膨润土对⁶³Ni(Ⅱ)吸附符合拟二级动力学方程且受到pH和离子强度影响较大。在低pH时，离子交换和外层络合是主要机理；随着pH增大发生去质子化反应，内层络合或者表面沉淀是主要机理。此外，共存电解质阳离子及腐植酸均对吸附影响显著。
- 膨润土 /
- 吸附 /
- ⁶³Ni(Ⅱ)
Abstract: In this work, the bentonite was characterized by Fourier transform infrared (FTIR) spectroscopy, X-ray powder diffraction(XRD), scanning electron microscope (SEM). The sorption of radionuclide ⁶³Ni(Ⅱ) on bentonite was investigated by batch technique under ambient conditions. The effect of contact time, pH and coexistent electrolyte cations on ⁶³Ni(Ⅱ) sorption to bentonite was examined. The results demonstrate that the kinetic adsorption data is well described by the pseudo-second-order model and the sorption of ⁶³Ni(Ⅱ) is strongly dependent on pH and ionic strength at low pH values. The sorption of ⁶³Ni(Ⅱ) is dominated by outer-sphere surface complexation or ion exchange at low pH, whereas inner-sphere surface complexation is the main sorption mechanism at high pH. In addition, the removal of ⁶³Ni(Ⅱ) to bentonite is also strongly affected by FA and cations.
- bentonite /
- sorption /
- ⁶³Ni(Ⅱ)

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参考文献(14)

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放射性核素63Ni(Ⅱ)在膨润土上的吸附

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出版历程

Sorption of Radionuclide 63Ni(Ⅱ) on Bentonite

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目录

放射性核素⁶³Ni(Ⅱ)在膨润土上的吸附

Sorption of Radionuclide ⁶³Ni(Ⅱ) on Bentonite