Highly selective fluorescent chemosensor for detecting Hg(II) in water based on pyrene functionalized coreshell structured mesoporous silica

Document Type

Article

Publication Date

7-1-2012

Abstract

Novel pyrene functionalized mesoporous coreshell structured silica (denoted as SiO 2@mSiO 2/Py-Si) was designed and synthesized as a highly selective fluorescent chemosensor for detecting Hg 2+ in water. The coreshell structured silica was prepared by a simple solgel process through coating SiO 2 nanospheres with a layer of ordered mesoporous silica. The surface of outer mesoporous silica shell was then further functionalized by the fluorescent chromophore alkoxysilane modified pyrene (Py-Si). XRD data confirmed that the hexagonal ordered mesoporous structure was preserved after functionalization. The chemosensing material successfully exhibited a remarkable turn on response toward Hg 2+ over miscellaneous metal ions. A good linear response towards Hg 2+ in the concentration range of 10 -810 -4 M was constructed with R 2+=0.9913. Most importantly, a satisfactory detection limit of 3.4×10 -9 g mL -1 (down to ppb level) was obtained, which is 100 times lower than our previous report of covalently grafted Py-OH to the bulk mesoporous silica SBA-15. These results indicated that SiO 2@mSiO 2/Py-Si can be used as a highly selective and sensitive fluorescence sensor for Hg 2+. © 2012 Elsevier B.V.

Publication Source (Journal or Book title)

Journal of Luminescence

First Page

1729

Last Page

1734

This document is currently not available here.

Share

COinS