Evaluation of Hydrophilized Graphite Felt for Electrochemical Heavy Metals Detection (Pb²⁺, Hg²⁺)

Abstract

Hydrophilized graphite felt has been used,for the first time, for the electrochemical detection of Hg2+ions both as single metal species and via its simultaneous detection with Pb2+. To do so, square wave voltammetry (SWV) method was developed with alginate modified graphite felt as working electrode. The structure of the graphite felt such as its high porosity and specific surface area coupled with its good electrical conductivity allows achieving large peak currents via the SWV method, suggesting that the alginate coating helps to preconcentrate metals at the carbon surface. The as-described electrode has low cost, it is easy to manipulate, and the electrochemical analysis can be performed by simple immersion of the felt in the metal solution.

Anodic stripping voltammetry with graphite felt electrodes for the trace analysis of silver

“…6 A novel solution to the GF wetting problem was proposed by Bouabdalaoui et al who used a pre-treatment involving glycerol and sodium alginate to produce hydrophilic GF electrodes that were then used to detect lead and mercury in aqueous solutions. 18 Demkin also used GF electrodes to detect trace tin in quiescent aqueous solutions of jewellery alloys, although no details of the GF wetting procedure were given. 19 Therefore, provided there is repeatable electrode wetting, the scientific literature suggests mega-macro carbon electrodes can make a valuable contribution to electroanalysis, bucking the trend of ever-decreasing electrode dimensions.…”

Electrochemical and Catalytic Properties of Carbon Dioxide-Activated Graphite Felt

“…Carbon-based electrodes find many different applications [ 1 ]. Electroanalysis can be mentioned here [ 2 , 3 ]. They are also used to remove polluting substances from water [ 4 , 5 , 6 ].…”

Review—Voltammetric Determination of Heavy Metals with Carbon-Based Electrodes

“…31,67,68,71 Other than plant-based materials, researchers also investigate the efficiency of other natural and nontoxic substances that can be used as modifiers. Among these substances, some amino acids are reported to provide encouraging result, 43,65,70 along with some other polysaccharides 72,95 and peptides. 44,96 Figure 2 shows how surface modifications made via certain commonly chosen materials alter and enhance the analytical performances and surface properties of electrodes in various studies selected and examined in this review.…”