Jornal de Química Física e Biofísica
Acesso livre
ISSN: 2161-0398
ISSN: 2161-0398
Mahmoud A. Hussein
An efficient electrochemical sensor based cross-linked polyaniline (CPA) /G-MWCNTS core shell nanocomposite (NCs) for trace determination of chlorophenol in water samples has been developed in the presence of a variety of carbon nanomaterials (CNMs) as continuation of our studies[1-4]. CPA was prepared by the chemical oxidative copolymerization of PANI and p-phenylenediamine (PPDA) with triphenylamine (TPA) in the presence of different CNMs material. CNMs include Graphene (G), single-walled carbon nanotube (SWCNTs), multi-walled carbon nanotube (MWCNTs), (G-SWCNTs) and (G-MWCNTs). The morphology, structure, electrical, thermal, and electrochemical properties of the NCs were investigated by different techniques, including FTIR, XRD, RAMAN, SEM, TEM, TGA and sensing measurements. The heat of formation of CPA monomer from TPA, PPDA and aniline (ANI) were computed using Density Functional Theory (DFT) calculations. The NCs of G-MWCNTs demonstrate higher affinity to oxidation of Chlorophenols (CPHs) than glassy carbon electrode (GCE), CPA/GCE and the other NCs. Differential pulse voltammetry (DPV) was used for the trace determination of 2,4-dichlorophenol (2,4-DCP). Under the optimum conditions, the peak current of 2,4-DCP was proportional to its concentration in the range of 0.05-0.6 µmolL-1. The detection limit was 7.6 nmolL-1. The method was successfully applied for the determination of 2,4-DCP in fish farm water with satisfactory recoveries. The suggested method has an advantage to be used for water samples due to its short analytical time, rapid response, high sensitivity, and excellent selectivity with good reproducibility.