CARVALHO, H. R.; CARVALHO, Hércules Rocha.
Resumen:
Heavy metals in industrial waste constitute environmental and health
risks even in a very low concentration. The U.S. Department of Health and Human
Services has determined that chromium compounds are known carcinogens with only
0,05 ppm being acceptable in drinking water. The objective of this work was the study
of electrochemical reduction of hexavalent chromium Cr(VI) to Cr(III) ions from a
dilute synthetic solution of K2Cr207 and Na2SO4(0,05 N). A graphite felt, RVG 4000 (
Le Carbone Lorraine, France) was used as work electrode in a flow - by reacts. Its
morphological characteristics such as its specific surface, porosity, average fibre
diameter and permeability were determined. The influence of some perametus offecting
the process selectivity such as initial concentration of Cr(VI), solution pH, current
intensity and cell voltage on the concentration - time relationship and conversion yield
are considered. Some kinectics aspects was studieds.