Red gum-capped gold nanoparticles for electrochemical sensing of bromocresol purple in water

摘要: Bromocresol purple (BCP) dye changes the chemical and physical properties of water, thereby affecting the aquatic organisms. Therefore, it is highly necessary to assess BCP in water samples. Herein, gold nanoparticles (AuNPs) capped with red gum were used for assessing BCP in river water. First, AuNPs were synthesized via the reduction of Au(III) using red gum as a reducing and stabilizing agent. The synthesized AuNPs were then optically identified by ultraviolet-visible (UV-Vis) spectroscopy, which showed the characteristic absorption peak of AuNPs at 530 nm. Additionally, they were electrochemically identified using the square-wave voltammetry (SWV) technique, which monitored the characteristic oxidation peak of AuNPs at 1 V. Furthermore, transmission electron microscopy (TEM) revealed that AuNPs are spherical with an average size of 25 nm. Moreover, X-ray diffraction (XRD) and Fourier transform …