Electrochemical sensor for bisphenol A based on ionic liquid functionalized Zn-Al layered double hydroxide modified electrode

• Ionic liquids functionalized layered double hydroxide (ILs-LDH) nanohybrid was synthesized by coprecipitation technique.
• ILs-LDH significantly enhanced the oxidation peak response and decreased the anodic overpotential of bisphenol A.
• Differential pulse voltammetry determination of bisphenol A presented a broad linear range with low detection limit.
• The proposed sensor exhibited satisfactory reproducibility, stability and selectivity.

The plate-like Zn-Al layered double hydroxide modified with 1-aminopropyl-3-methylimidzaolium tetrafluoroborate (named as ILs-LDH) was synthesized by coprecipitation method. Several techniques confirmed the layered structure of ILs-LDH with a disk-like morphology. A novel electrochemical sensor based on ILs-LDH modified glass carbon electrode (GCE) was developed for bisphenol A (BPA) determination. Experimental factors including modified content, pH, scan rate, accumulation time and potential had been carefully optimized. ILs-LDH/GCE performed the excellent electro-oxidation ability toward BPA with the more negative oxidation overpotential and larger peak current than bare GCE or LDH/GCE. Differential pulse voltammetry determination of BPA afforded a wider linear range from 0.02 to 3 μM with the detection limit of 4.6 nM (S/N = 3). The fabricated sensor demonstrated an acceptable reproducibility, good stability and high sensitivity. The proposed method was successfully used to detect BPA in real water samples with satisfactory recovery ranging from 94.9% to 102.0%.