High performance of phosphonate-functionalized mesoporous silica for U(VI) sorption from aqueous solution

Li Yong Yuan, Ya Lan Liu, Wei Qun Shi, Yu Long Lv, Jian Hui Lan, Yu Liang Zhao, Zhi Fang Chai

Research output: Contribution to journalArticle

132 Scopus citations

Abstract

The renaissance of nuclear energy promotes increasing basic research on the separation and enrichment of nuclear fuel associated radionuclides. Herein, we report the first study for developing mesoporous silica functionalized with phosphonate (NP10) as a sorbent for U(VI) sorption from aqueous solution. The mesoporous silica was synthesized by co-condensation of diethylphosphatoethyltriethoxysilane (DPTS) and tetraethoxysilane (TEOS), using cationic surfactant cetyltrimethylammonium bromide (CTAB) as the template. The synthesized silica nanoparticles were observed to possess a mesoporous structure with a uniform pore diameter of 2.7 nm, and to have good stability and high efficiency for U(VI) sorption from aqueous solution. A maximum sorption capacity of 303 mg g-1 and fast equilibrium time of 30 min were achieved under near neutral conditions at room temperature. The adsorbed U(VI) can be easily desorbed by using 0.1 mol L-1 HNO3, and the reclaimed mesoporous silica can be reused with no decrease of sorption capacity. In addition, the preconcentration of U(VI) from a 100 mL aqueous solution using the functionalized mesoporous silica was also studied. The preconcentration factor was found to be as high as 100, suggesting the vast opportunities of this kind of mesoporous silica for the solid-phase extraction and enrichment of U(VI).

Original languageEnglish (US)
Pages (from-to)7446-7453
Number of pages8
JournalDalton Transactions
Volume40
Issue number28
DOIs
StatePublished - Jul 28 2011

ASJC Scopus subject areas

  • Inorganic Chemistry

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