Selective and sensitive detection of 4‐nitrophenol in ecological water samples based on terbium tungstate anchored with graphitic nitride

In this work, the Tb 2 (WO 4 ) 3 /C 3 N 4 composite is for the electrochemical sensing of 4‐nitrophenol (4‐NP). Tb 2 (WO 4 ) 3 was prepared by hydrothermal method. Tb 2 (WO 4 ) 3 homogeneously functionalized with the g‐C 3 N 4 by a noncovalent π–π interaction. Besides, field emission scanning electron microscopy, x‐ray diffraction studies, and energy‐dispersive x‐ray spectroscopy were utilized to characterize the prepared materials. Cyclic voltammetry and amperometry techniques were used to investigate the electrocatalytic behavior of prepared electrode materials. The reduction in 4‐NP exhibits high electrocatalytic activity, with best at working voltage with a linear response range of up to 1200 μM. Moreover, the SPCE/C 3 N 4 /Tb 2 (WO 4 ) 3 electrode exhibited a detection limit and sensitivity of 0.23 μM and 1.72 μAμM −1 cm −2 , respectively. The electrode provides a workable platform for the analysis of 4‐NP in water samples and is highly reproducible and stable.