Fluorescence sensor using a molecularly imprinted polymer as a recognition receptor for the detection of aluminium ions in aqueous media |
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Authors: | Sing Muk Ng R Narayanaswamy |
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Institution: | (1) School of Chemical Engineering and Analytical Science, The University of Manchester, Manchester, M60 1QD, UK |
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Abstract: | This paper describes the investigation of a molecularly imprinted polymer (MIP) as a sensing receptor for Al3+ ion detection by using an optical approach. Al3+ ion was adopted as the template molecule and 8-hydroxyquinoline sulfonic acid ligand as the fluorescence tag. The polymer
was synthesised using acrylamide as monomer, 2-hydroxyethyl methacrylate as co-monomer and ethylene glycol dimethracylate
as cross-linker. The free radical polymerisation was performed in methanol and initiated by 2,2′-azobisisobutyronitrile at
70 °C. The imprinted polymer was fluorometrically characterised using a fibre optic attachment in a self-designed flow-cell.
NaF was used to leach the Al3+ ion from the MIP. The optimum pH for the rebinding of Al3+ ion with the leached polymer was found to be pH 5 and the fluorescence response was found to be stable within the buffer
strength range of 0.05–0.10 M. The fluorescence intensity during Al3+ ion rebinding was inversely dependent on temperature, and a low interference response (<3%) toward metal ions except for
Cu2+ and Zn2+ ions was observed. The polymer rebinding repeatability study conducted over 9 cycles with Al3+ ion (0.8×10−4 M) was found to give an RSD value of 2.82% with a standard deviation of 0.53. The dynamic range of the system was found to
be linear up to 1.0×10−4 M Al3+ ion with a limit of detection of 3.62 μM. |
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Keywords: | Molecularly imprinted polymer (MIP) Optical sensor Aluminium ion 8-Hydroxyquinoline sulfonic acid (8HQS) Fluorescence complex |
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