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Abstract: This paper proposes the preparation of a hybrid adsorbent material organically modified with N1-[3-(trimethoxysilyl)propyl]diethylenetriamine and imprinted ionically with Cu(II) ions. The structure of functionalized silica matrix with an organic group containing electron-donating nitrogen atoms allows several applications such as adsorption of metal ions, electrocatalytic studies, and development of electrochemical sensors. The electrochemical behavior of the hybrid material was investigated using a carbon paste electrode in different electrochemical techniques: cyclic voltammetry, differential pulse voltammetry, differential pulse anodic stripping voltammetry, and chronoamperometry. DPASV yielded the best results and linear response to Cu(II) in the concentration range of 6.0 x 10-4 to 5.4 x 10-3 mmol L-1 (R2 = 0.999; n = 9) using a pre-concentration time (tpc) of 1800 s at a reduction potential (Ered) of -0.51 V versus SCE and a scan rate of 20 mV s-1, with a detection limit estimated at 1.82 x 10-7 mmol L-1. The samples were evaluated using the proposed sensor and a good recovery of Cu(II) was obtained in the range from 92.88 to 110.89%. The proposed method for DPASV was used for Cu(II) determination in samples of tap water, and the results from literature and that of flame atomic absorption spectrometry
Template and target information: copper ion, Cu(II)
Author keywords: ion-imprinted, Diethylenetriamine, copper(II), Tap water