A Single-Step Electrochemical Preparation of Cadmium Sulfide Anchored ERGO/β-CD Modified Screen-Printed Carbon Electrode for Sensitive and Selective Detection of Nitrite

We report a single-step electrochemical process for the preparation of electrochemically reduced graphene oxide/beta-cyclodextrin/cadmium sulfide (ERGO/beta-CD/CdS) composite on the screen-printed carbon electrode (SPCE). Thereby, the cyclic voltammetry was employed to simultaneously reduce the GO and deposit the CdS from aqueous solutions. This preparation technique was successfully promoted the ERGO/beta-CD/CdS on SPCE. The structure and morphology of ERGO/beta-CD/CdS were studied by scanning electron microscope (SEM), energy dispersive X-ray (EDX), Raman spectra, FTIR spectra and electrochemical techniques. These techniques are confirmed that the as-deposited material was CdS and it was strongly anchored on ERGO/beta-CD. Herein, the beta-CD was used to facilitate the strong binding of CdS on RGO/SPCE. This ERGO/beta-CD/CdS/SPCE revealed an excellent electrocatalytic activity toward the detection of nitrite when compared with other modified electrodes. The ERGO/beta-CD/CdS/SPCE was showed a well-defined oxidation peak for nitrite and also the amperometric responses indicated the sensor has a wide linear range and very low limit of detection 21 nM. These results suggested that the ERGO/beta-CD/CdS would be a promising material for the development of electrochemical nitrite sensor and it was successfully applied to the analysis of nitrite in water samples. (C) 2019 The Electrochemical Society.