Cr (VI) electromechimal reduction using RVG 4OOO graphite felt as the electrode

AUTOR(ES)

Vilar, E.O., Cavalcanti, E.B., Carvalho, H.R., Sousa, F.B.

FONTE

Brazilian Journal of Chemical Engineering

DATA DE PUBLICAÇÃO

2003-09

RESUMO

Even in at very low concentrations, heavy metals in industrial waste constitute environmental and health risks. The U.S. Department of Health and Human Services has recognized as chromium compounds and defined carcinogens the level acceptable in drinking water as being only 0.05 ppm. The objective of this work was the electrochemical reduction of hexavalent chromium Cr (VI) to Cr (III) ions in a dilute synthetic solution of K2Cr2O7 and Na2SO4 (0.05N). A plug-flow reactor with an RVG 4000 graphite felt (Le Carbone Lorraine, France) electrode was used for this work. Its morphological characteristics such as specific variables surface, porosity, average fibre diameter and permeability were determined. The influencing process selectivity such as initial concentration of Cr (VI), solution pH, current intensity and conversion yield are considered. The fractional conversion achieved in the plug-flow reactor in the present work, was about 90%.

Documentos Relacionados

• NAD(P)H-dependent chromium (VI) reductase of Pseudomonas ambigua G-1: a Cr(V) intermediate is formed during the reduction of Cr(VI) to Cr(III).
• Cinética e equilíbrio de adsorção dos oxiânions Cr (VI), Mo (VI) e Se (VI) pelo sal de amônio quaternário de quitosana
• Reduction of chromium (VI) by the indirect action of Thiobacillus thioparus
• A Biosensor Using Poly(4-Aminophenol)/acetylcholinesterase modified graphite electrode for the detection of dichlorvos
• Um método quimiluminescente baseado em imagens digitais para determinação de Cr (VI) em águas usando um sistema fluxo batelada.