Mesoporous silica SBA-15 functionalized with phosphonate and amino groups for uranium uptake

Xiaoliang Wang, Liyong Yuan, Yanfei Wang, Zijie Li, Jianhui Lan, Yalan Liu, Yixiao Feng, Yuliang Zhao, Zhifang Chai, Weiqun Shi

Research output: Contribution to journalArticle

63 Scopus citations

Abstract

Mesoporous silicas have a very attractive ability of sorption and enrichment of metal ions due to their huge surface area and facile functionalization by organic ligands. In this work, phosphonate-amino bifunctionalized mesoporous silica SBA-15 (PA-SBA-15) as U(VI) sorbent was fabricated through post-grafting method. The obtained mesoporous silica was characterized by SEM, XRD, NMR and nitrogen sorption/desorption experiments, which revealed the existence of ordered mesoporous structure with uniform pore diameter and large surface area. The adsorptivity of PA-SBA-15 for U(VI) from aqueous solution was investigated using batch sorption technique under different experimental conditions. The preliminary results show that the U(VI) sorption by PA-SBA-15 is very quick with equilibrium time of less than 1 h, and the U(VI) uptake is as large as 373 mg/g at pH 5.5 under 95 °C. The sorption isotherm has been successfully modeled by the Langmuir isotherm, suggesting a monolayer homogeneous sorption of U(VI) in PA-SBA-15. The sorption is pH-dependent due to the pH-dependent charge of sorbent in the aqueous solution. The thermodynamics research shows that the sorption is a feasible and endothermic process. Based on these results, PA-SBA-15 could be a promising solid phase sorbent for highly-efficient removal of U(VI) ions from waste water and enrichment of U(VI) from a solution at a very low level.

Original languageEnglish (US)
Pages (from-to)1705-1711
Number of pages7
JournalScience China Chemistry
Volume55
Issue number9
DOIs
StatePublished - Sep 1 2012

Keywords

  • Amino group
  • Bifunctionalized
  • Mesoporous silica SBA-15
  • Phosphonate
  • Sorption
  • Uranium

ASJC Scopus subject areas

  • Chemistry(all)

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