A novel electrochemical sensor based on TiO2-Ti3C2Tx/CTAB/chitosan composite for the detection of nitrite

摘要

An electrochemical sensing platform based on TiO2-Ti3C2Tx nanohybrid, hexadecyl trimethyl ammonium bromide (CTAB) and chitosan (CS) modified glassy carbon electrode (GCE) has been developed for the detection of nitrite. The TiO2-Ti3C2Tx nanohybrid was synthesized by a two-step calcination process. The nanohybrid and its preparation process were characterized by scanning electron microscopy, X-ray diffraction and X-ray photoelectron spectroscopy. Electrochemical methods were used to characterize and investigate the electrochemical behavior and nitrite response of TiO2-Ti3C2Tx/CTAB/CS/GCE. Under optimized conditions, the prepared TiO2-Ti3C2Tx/CTAB/CS/GCE electrode displayed two linear ranges from 0.003 to 0.25 mM and 0.25 to 1.25 mM with a detection limit of 0.85 mu M. Furthermore, the practical applicability of the electrochemical sensor was validated by the detection of nitrite in water and milk samples with good recovery. (C) 2020 Elsevier Ltd. All rights reserved.