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Abstract: A novel molecularly imprinted electrochemical sensor for 2,4-dichlorophenol(2,4-DCP) detection was fabricated on the surface of gold electrode by self-assembly of o-aminothiophenol(oATP) and electropolymerization of oATP/Au nanoparticles in the presence of template molecule. The modification procedure was characterized via cyclic voltammetry and electrochemical impedance spectroscopy. In the presence of K3Fe(CN)6 as redox probe, the peak current of K3Fe(CN)6 decreased linearly with the increasing concentration of 2,4-DCP from 5.0 x 10-8 to 1.2 x 10-4 mol/L(R2=0.9964) with a detect limit of 1.5 x 10-8 mol/L(S/N=3). Three chlorophenols possesing analogous structures, including 2,6-DCP, 2,4,6-trichlorophenol(2,4,6-TCP) and pentachlorophenol(PCP) were chosen to examine the specific recognition ability of the imprinted sensor. The results showed that MIP electrode had the highest current response toward 2,4-DCP. In addition, the feasibility of its practical applications has been demonstrated in the analysis of four water samples with the recoveries ranged from 95.2% to 109.3%.
Template and target information: 2,4-dichlorophenol, 2,4-DCP
Author keywords: 2,4-Dichlorophenol, Molecularly imprinted electrochemical sensor, Au nanoparticle, Poly-o-aminothiophenol, self-assembly, electrochemical polymerization