A novel electrochemical sensor based on TiO2–Ti3C2TX/CTAB/chitosan composite for the detection of nitrite

An electrochemical sensing platform based on TiO 2 –Ti 3 C 2 T X nanohybrid, hexadecyl trimethyl ammonium bromide (CTAB) and chitosan (CS) modified glassy carbon electrode (GCE) has been developed for the detection of nitrite. The TiO 2 –Ti 3 C 2 T X 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 TiO 2 –Ti 3 C 2 T X /CTAB/CS/GCE. Under optimized conditions, the prepared TiO 2 –Ti 3 C 2 T X /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 μM. Furthermore, the practical applicability of the electrochemical sensor was validated by the detection of nitrite in water and milk samples with good recovery.