Trace determination of lead and cadmium using graphene/[Ru(NH3)6]3+/nafion modified glassy carbon electrodes

College

College of Science

Department/Unit

Physics

Document Type

Article

Source Title

Journal of New Materials for Electrochemical Systems

Volume

19

Issue

4

First Page

223

Last Page

228

Publication Date

1-1-2016

Abstract

Systems. Graphene/[Ru(NH3)6] 3+/nafion modified glassy carbon electrodes were fabricated using the drop coating technique. The fabricated electrodes were characterized using scanning electron microscopy (SEM) and cyclic voltammetry (CV). Simultaneous detection of lead (Pb2+) and cadmium (Cd2+) was done via anodic stripping voltammetry (ASV). The effects of varying the amounts of graphene and [Ru(NH3)6] 3+ on the transport and sensing properties of the modified electrodes were determined. SEM results showed that the deposited films were smooth and uniform. CV results showed that the peak currents increase monotonically with the amounts of graphene and [Ru(NH3)6] 3+. ASV results showed that modification of the GCE with graphene, [Ru(NH3)6] 3+ and Nafion greatly enhanced the electrode's sensitivity in detecting Pb2+ and Cd2+. This can be attributed to the high surface area-to-volume ratio of graphene, the mediation of electron transfer by [Ru(NH3)6] 3+ and the antifouling and cationic exchange capabilities of Nafion. The highest peak current for both Pb2+ and Cd2+ were obtained from the electrode modified with 1.5 mg [Ru(NH3)6] 3+ and 3.0 mg graphene. A linear relationship between the peak current and metal concentration was obtained in the range of 1.4 ppb to 20 ppb for both Pb2+ and Cd2+ with a detection limit of 1.4 ppb. The modified electrodes were successful in detecting Cd2+ in real water samples. ASV results were verified using atomic absorption spectroscopy. © J. New Mat. Electrochem.

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Digitial Object Identifier (DOI)

10.14447/jnmes.v19i4.277

Disciplines

Physics

Keywords

Cadmium; Graphene; Lead; Anodic stripping voltammetry

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