Open AccessCr (VI) electromechimal reduction using RVG 4OOO graphite felt as the electrode
Author(s) -
Eudésio Oliveira Vilar,
Eliane Bezerra Cavalcanti,
H.R. Carvalho,
Frederico Barbosa de Sousa
Publication year - 2003
Publication title -
brazilian journal of chemical engineering/brazilian journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.313
H-Index - 52
eISSN - 1678-4383
pISSN - 0104-6632
DOI - 10.1590/s0104-66322003000300009
Subject(s) - hexavalent chromium , chromium , graphite , electrode , porosity , materials science , electrochemistry , photocatalysis , selectivity , nuclear chemistry , chemical engineering , chemistry , metallurgy , composite material , catalysis , organic chemistry , engineering
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%