Abstract
Abstract A glassy carbon electrode (GCE) was modified with platinum (Pt)-supported ZSM-5 (GCE/ZSM-5/Pt) prepared by an ultrasonic-assisted hydrothermal method and applied to the electrochemical detection of cadmium (Cd2+) ions. Ultrasonic preparation method is an emerging green technique for the preparation of active catalyst materials with an enhanced optical, electrical and morphological properties. The ZSM-5/Pt (2.4–50%) catalyst was prepared by the ultrasound irradiation method. During this preparation, the ultrasonic irradiation time, ultrasonic sources, power density, stirring, and reactor temperature were considered. The intrinsic and extrinsic properties of ZSM-5/Pt (2.4–50%), such as the surface area, pore volume, particle size, pore diameter and crystallinity could be controlled by the ultrasonic-assisted method. The prepared electrode material was investigated with physical and chemical characterization techniques. The GCE/ZSM-5/Pt (5.4%) modified electrode expressed higher electrocatalytic activity than other modified electrodes for the determination of Cd2+ ions. Analytical factors of the electrochemical sensor, such as deposition time, pH, and deposition potential, were estimated by differential pulse voltammetry (DPV). The GCE/ZSM-5/Pt (5.4%) modified electrode had a low limit of detection (0.012 μM), wide linear range (0.1–7.2 μM), high sensitivity (17.639 μAμMcm−2), high stability, and high reproducibility. Hence, the GCE/ZSM-5/Pt (5.4%) electrode sensor can be applied for sensing hazardous Cd2+ metal ions in environmental water samples with appreciable recovery.
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