کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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75548 | 49117 | 2008 | 7 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: A mesoporous silica functionalized by a covalently bound naphthalene-based receptor for selective optical detection of fluoride ion in water A mesoporous silica functionalized by a covalently bound naphthalene-based receptor for selective optical detection of fluoride ion in water](/preview/png/75548.png)
The naphthalene urea fluorescent receptor 1 immobilized mesoporous silica (FMS) and the fluorescent receptor 1 immobilized silica particles (FSP) were prepared via sol–gel reaction. The sensing ability of FMS and FSP was studied by addition of the anions F–, Cl–, Br–, I– and HSO4- to water suspensions of the assayed solid. Of all the anions tested, addition of fluoride ion to a suspension of FMS resulted in the largest decrease in the fluorescence intensity of naphthalene of FMS. Thus, fluoride ions bind with four urea N–H protons of receptor 1 onto FMS. On the other hand, addition of Cl–, I–, Br– and HSO4- did not reduce the fluorescence of FMS. In case of FSP, the sensitivity for fluoride ion was 8 times lower than that of FMS due to immobilization of smaller amounts of receptor 1 in silica particles. The result implies that mesoporous silica with its large surface area is useful as a supporting material.
Journal: Microporous and Mesoporous Materials - Volume 114, Issues 1–3, 1 September 2008, Pages 448–454