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Abstract: A novel magnetic imprinted electrochemical sensor was prepared based on magnetic graphene modified carbon electrode with 4-octylphenol (4-OP) as the template molecule and dopamine as the functional monomer. The morphology of the imprinted sensor based on magnetic graphene was characterized with scanning electron microscopy. The electrochemical performances of the molecularly imprinted sensor were characterized with cyclic voltammetry and differential pulse voltammetry (DPV). The results showed that the imprinted electrochemical sensor had special recognition ability toward 4-OP. The magnetic imprinted electrochemical sensor performance was optimized by using DPV method. The results showed that the response current of the imprinted electrochemical sensor revealed a linear relationship with the negative logarithm of 4-OP concentrations range of 5.0 x 10-6 -5.0 x 10-9 mol/L with the detection limit of 3.64 x 10-10 mol/L (S/N=3). The molecularly imprinted electrochemical sensor was successfully used to detect 4-OP in water samples with the recoveries of 96.0%-104.0%.
Template and target information: 4-octylphenol, 4-OP
Author keywords: molecularly imprinted, Magnetic graphene, Electrochemical sensor, dopamine, 4-Octylphenol