Hydrothermally synthesized a pyrochlore-type bismuth stannate (Bi2Sn2O7): Efficient electrochemical detection of nitroxoline

An excellent low-cost and eco-friendly electrochemical sensor, based on Bi2Sn2O7 modified glassy carbon electrode has been successfully developed for the wide linear range and lower limit of detection of nitroxoline. [Display omitted] •Electrochemical sensing of nitroxoline using low-cost and eco-friendly Bi2Sn2O7/GCE.•Ability to detect a low detection limit of 0.0528 µM.•Exhibiting strong electrocatalytic activity towards the reduction of nitroxoline.•In accordance with linear range obtained from 0.04 to 184 µM – lower concentration.•Development of electrochemically modified Bi2Sn2O7/GCE sensor. A novel electrochemical sensor based on Bi2Sn2O7 modified glassy carbon electrode (GCE) has been successfully developed for the determination of nitroxoline (NXT). The Bi2Sn2O7 is synthesized using a hydrothermal method, and its physicochemical properties are characterized by SEM, HR-TEM, EDX, elemental mapping, FT-IR and XRD, to identify structural morphology, functional group, and phase purity. The Bi2Sn2O7 modified GCE has been investigated towards the electrochemical performance of NXT through cyclic voltammetry (CV) and differential pulse voltammetry (DPV) techniques in a three-electrode system. The modified Bi2Sn2O7/GCE exhibits better electrochemical activity towards the detection of NXT with lower cathodic peak potential (Epc = −0.83 V) and high cathodic peak current (Ipc = −99.3 µA) compared to other reported modified electrodes. Under the optimized conditions, the present sensor shows a wide linear range (0.04–184 µM) and lower limit of detection (0.0528 µM). Further, the selectivity, stability, reproducibility and repeatability tests are performed by using the synthesised Bi2Sn2O7 and found to be satisfactory. In the presence of interfering species like nitro groups, antibiotic drugs and inorganic species (cationic and anionic), the reduction peak current response does not cause any variation in results and thus discloses good selectivity towards the detection of NXT. Besides, the Bi2Sn2O7/GCE exhibits excellent electrochemical sensing towards the detection of NXT.