Bismuth sulfide microstructures decorated with functionalized boron nitride composite for electrochemical detection of sulfadiazine.

In this work, the hydrothermal method was used to synthesize f-BN@Bi 2 S 3  nanocomposite and used as an electrocatalyst for the detection of sulfadiazine (SD) drug. Various spectroscopic and voltammetric techniques were adopted to evaluate the morphological and structural features of the prepared materials. The modification of the electrode results in good electrocatalytic activity and excellent sensitive towards the oxidation of SD because of its huge active surface area, high sensitivity, and electrical conductivity provided by the synergistic effects of the f-BN@Bi 2 S 3 nanocomposite. This modified electrode exhibited linearity in the range 0.01-62 µM at E pa  = 0.93 V (vs. Ag/AgCl). Furthermore, according to the electrochemical reaction towards the SD, a modified electrode of f-BN@Bi 2 S 3 has a LOD value of 0.0015 µM, sensitivity (8.42 μA·μM -1 ·cm -2 ), good anti-interfering ability, and good repeatability. The suggested electrochemical sensor has high detection performance for monitoring water and urine samples. Notably, relative standard deviations (RSD) and recoveries of the proposed sensor for spiked water and urine samples are in the ranges of 0.014-0.75% and 98.97-99.98% (n = 3), respectively.