Detection of Cd2+ based on Nano-Fe3O4/MoS2/Nafion/GCE sensor

Abstract

It is necessary to detect cadmium ions in seawater with high sensitivity because the pollution of cadmium ions seriously endangers the health and life of human beings. Nano-Fe3O4/MoS2/Nafion modified glassy carbon electrode was prepared by a drop coating method. The electrocatalytic properties of Nano-Fe3O4/MoS2/Nafion were measured by Cyclic Voltammetry (CV). Differential Pulse Voltammetry (DPV) was used to study the stripping Voltammetry response of the modified electrode to Cd2+. The optimal conditions were determined: In 0.1 mol/L HAc-NaAc solution, the solution pH was 4.2, the deposition potential was − 1.0 V, and the deposition time was 720 s, the membrane thickness was 8 μL. Under the optimum condition, the linear relation of Cd2+ concentration was found in the range of 5–300 μg/L, and the detection limit was 0.053 μg/L. The recovery of Cd2+ in seawater ranged from 99.2 to 102.9%. A composite material with simple operation, rapid response and high sensitivity was constructed for the determination of Cd2+ in seawater. Graphical abstract

Novel Aspects in the Voltametric Determination of Heavy Metals: A Minireview

“…The linear relationship of Cd concentration was found in the range of 5-300 μg/L and the detection limit was 0.053 μg/L. Recovery of Cd in seawater ranged from 99.2 to 102.9 % [85]. A further determination of Cd in water samples (dam water, lake water, wastewater) was performed in a phosphate buffer, pH 5, by means of an organic metal frame and graphene oxide graphite rod electrode (GRE-ZIF-8/GO) and the differential pulse anodic stripping voltammetry.…”