Surface molecular imprinting on dye-(NH₂)-SiO₂ NPs for specific recognition and direct fluorescent quantification of perfluorooctane sulfonate

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• 作者：Hui Feng^a ; ^bAuthor Vitae ; Niya Wang^aAuthor Vitae ; ThanhThuy Tran.T^a ; ^cAuthor Vitae ; Lijuan Yuan^aAuthor Vitae ; Jiezhen Li^aAuthor Vitae ; Qingyun Cai^a ; ^{qycai0001@hnu.edu.cn" class="auth_mail}Author Vitae
• 关键词：Molecularly imprinted polymer ; Fluorescence optosensor ; dye&ndash ; (NH2)&ndash ; SiO2 NPs ; Perfluorooctane sulfonate
• 刊名：Sensors and Actuators B: Chemical
• 出版年：May, 2014
• 年：2014
• 卷：195
• 期：Complete
• 页码：266-273
• 全文大小：2552 K

文摘

A perfluorooctane sulfonate (PFOS, C₈F₁₇SO₃^{鈭?/sup>) molecularly imprinted (MIP) fluorescence sensor was developed by anchoring the MIP polymer on the surface of SiO₂ NPs via a surface molecular imprinting process. Fluorescence dye and organic amine were covalently immobilized onto the surface of MIP-SiO₂ NPs to form a hybrid monolayer of dye fluorophores and amine ligands which acted as the receptor sites to bind PFOS(C₈F₁₇SO₃鈭?/sup>) species through the acid-base pairing and hydrogen-bond interaction under acid condition (pH 鈭?#xA0;3.5). The specific binding of PFOS into the recognition cavities in the polymer matrixes results in the fluorescence quenching due to the electron transfer from the fluorescence dye to PFOS. This proposed method can selectively and sensitively detect down to 5.57 渭g L鈭? of PFOS in water, and a linear relationship has been obtained covering the concentration range of 5.57-48.54 渭g L鈭? (10.36-90.2 nM).}