Journal
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
Volume 311, Issue 1, Pages 269-278Publisher
SPRINGER
DOI: 10.1007/s10967-016-4937-8
Keywords
Hollow silica microspheres; Functionalization; U (VI); Equilibrium and kinetic
Funding
- National Natural Science Fund Program [21366001, 11375043]
- International Scientific and Technological Cooperation Projects [2015DFR61020]
- Jiangxi provincial Science & Technology Pillar Program [S2016NYYBF0015]
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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.
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