Determination of Bisphenol A in Beverages by an Electrochemical Sensor Based on Rh2O3/Reduced Graphene Oxide Composites

Abstract

A novel electrochemical sensor, based on a Rh2O3–reduced graphene oxide (rGO) composite modified carbon electrode, has been developed for detecting bisphenol A (BPA) in beverages. The prepared Rh2O3/rGO and its precursor materials were characterized by scanning electron microscope (SEM) and X-ray diffraction (XRD). Under optimum conditions, the sensor presented good electrochemical performance for analyzing BPA, with a linear range of 0.6–40 μM, detection limit of 0.12 μM, good reproducibility, and excellent stability. The good performance can be attributed to the combination of the good catalytic properties of Rh2O3 and good conductivity of rGO. The sensor is directly used for detecting BPA in the residual solutions of four beverages after simple filtration, with satisfactory recoveries of 93–99%.

Graphitic Carbon-Coated PtCoNi Alloys Supported on N-Doped Porous Carbon Nanoflakes for Sensitive Detection of Bisphenol A

“…Next, 0.5 g of the pieces was put into 100 mL of ethanol for 2 h under ultrasonication. Finally, the supernatant was taken as a sample of thermal paper …”

“…Finally, the supernatant was taken as a sample of thermal paper. 37 ■ RESULTS AND DISCUSSION Characterizations. Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) were adopted to characterize the morphology and structural features of the representative product.…”

Evaluation of electrocatalysis behavior of Fe3O4 magnetic nanoparticles on oxidation of Bisphenol A as the first step for its detection

“…Figure 3 shows CVs of Fe3O4-CPE in PBS pH 7 without (a) and with PBA 10 ppm at scan rate of 0.1 V/s. nanoparticles directly reduced at the electrode surface according to the following reaction [1] :…”

“…(a) (b) Figure 3: CV voltammograms of CPE (N. 0) and Fe3O4-CPEs in PBS pH 7 without (a) and with PBA 10 ppm (b) at scan rate of 0.1 V/s (vs Ag/AgCl) Fe3O4(s)+2e − +6H + (aq) → 2Fe 2+ (aq)+3H2O+FeO(s) (1) Then, Fe 2+ ions produced could combine with phosphate ions in the PBS solution:…”

“…Bisphenol A (BPA -C15H16O2), one of the most produced and used chemicals, has been widely used for many fields in life. [1] It is often involved in various food contact materials (i.e., canned packaging, bottles, and lacquer coating). Its widespread usage, especially in these food contact materials, has inevitably lead to its exposure to human beings via food and drinking water.…”