Detection of Perfluorooctane Sulfonate in Aqueous Environment Based on Molecular Imprinting Coupled Bipolar Electrochemiluminescence Sensor
Combining the specific recognition ability of molecular imprinting polymer(MIP)and the high sensitivity and anti-interference characteristics of bipolar electrochemical luminescence sensing(BPECL),an MIP/BPECL sensor was constructed for the detection of perfluorooctane sulfonate(PFOS)in sewage.Using PFOS as the template molecule and o-phenylenediamine(o-PD)as the functional monomer,the molecular-imprinted polymer was specifi-cally identified by negative extreme electropolymerization of bipolar electrodes.The electrodes were characterized by means of scanning electron microscopy(SEM)and cyclic voltammetry(CV).The MIP/BPECL sensing system was constructed with ruthenium bipyridine/tri-n-propylamine[Ru(bpy)32+/TPrA]as the output signal at the positive extremity of the bipolar electrode.Under optimized conditions,the electrochemical sensor displayed a wide linear range from 1 nmol/L to 1000 nmol/L with a low limit of detection of 0.43 nmol/L(S/N=3).The sensor is applied to the actual sample of the environmental water labeling recovery test,and the result is good.The constructed MIP/BPECL sensor has the advantages of high sensitivity,good specificity and strong anti-interference ability.By changing the template molecule of molecular imprinting,it is expected to realize the application of this sensor in the detection of other environmental pollutants.
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