Characteristics of equilibrium and kinetic for U(VI) adsorption using novel diamine-functionalized hollow silica microspheres
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- 作者：Hongbin Zou ; Limin Zhou ; Zhiwei Huang…
- 关键词：Hollow silica microspheres ; Functionalization ; U (VI) ; Equilibrium and kinetic
- 刊名：Journal of Radioanalytical and Nuclear Chemistry
- 出版年：2017
- 出版时间：January 2017
- 年：2017
- 卷：311
- 期：1
- 页码：269-278
- 全文大小：
- 刊物类别：Chemistry and Materials Science
- 刊物主题：Nuclear Chemistry; Physical Chemistry; Nuclear Physics, Heavy Ions, Hadrons; Diagnostic Radiology; Inorganic Chemistry;
- 出版者：Springer Netherlands
- ISSN：1588-2780
- 卷排序：311
文摘
The diamine-functionalized hollow silica microspheres (DA-HSM) were successfully synthesized for highly efficient sorption of U(VI). The sorption of U(VI) on DA-HSM may be proceeded through anion-exchange and adduct-type mechanism at low pH and amine-U(VI) chelation at high pH. The sorption kinetic could be described by the pseudo-second-order model; whereas the sorption isotherms could be fitted by the Langmuir model with the maximum mono-layer sorption capacity of 126.6 mg/g at 298 K. U(VI) sorption on DA-HSM was endothermic, spontaneous, and feasible in nature. The DA-HSM could be regenerated and reused without significant reduction of the sorption capacities.