The removal of lead from an acid borate-nitrate solution containing Pb(II) was used to characterize the mass transport properties of an electrolytic reactor with reticulated vitreous carbon cathodes, operated in the flow-through mode. Current potential curves recorded at a rotating vitreous carbon disc electrode were used to determine the diffusion coefficient for Pb(II) under the conditions of the experiments. The performance and figures of merit of the electrolytic reactor were investigated by using different flowrates and cathode porosities. Dimensionless Sherwood and Reynolds numbers were correlated to characterize the mass transport properties of the reactor, and they were fitted to the equation Sh=24Re0.32Sc0.33
"Zeferino Vaz"-13083-970-Campinas-SP Recebido em 11/5/99; aceito em 13/8/99 OBTENTION OF HEAVY METAL IONS ADSORBENT MATERIAL BY 2-MERCAPTOBENZI-MIDAZOLE ELECTROPOLIMERIZATION AT RETICULATED VITREOUS CARBON SURFACE. Electrochemical methods applied to organic species transformation has been used as excellent synthesis tools. CC bonds can be established, making possible polymer synthesis by both anodic and cathodic reactions of suitable monomer species at the working electrode surface. In this study, anodic procedure was used to electropolymerization of 2-mercaptobenzimidazole at reticulated glassy carbon (RGC) surface. 2-mercaptobenzimidazole presents ligand sites towards Hg 2+ , Ag + and Cu 2+ ions. The obtained material has been able to adsorb the above mentioned ions in aqueous solution.
The possibility of producing polymer-coated electrodes containing complexing agents capable of collecting metal ions was investigated. The organic ligands 2-mercaptobenzimidazole and 2-mercaptobenzothiazole were used as monomers for electropolymerization on glassy carbon electrodes. The electroanalytical applicability of the modified electrodes was evaluated for Hg2+ ions, by applying a chemical preconcentration step with subsequent measurement by differential pulse voltammetry. The influence of some electropolymerization parameters, such as scan rate, monomer concentration and the number of cyclic scans, on the voltammetric response of mercury@) was studied. A 5 min preconcentration period allowed the detection of 0.08 mgL (4.0 x
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