INVESTIGADORES
GRAU Javier Mario
artículos
Título:
Removal of cadmium and production of cadmium powder using a continuous undivided electrochemical reactor with a rotating cylinder electrode
Autor/es:
J. M. GRAU; J M. BISANG
Revista:
JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
Editorial:
John Wiley & Sons, Ltd
Referencias:
Lugar: Norwich; Año: 2002 vol. 77 p. 465 - 472
ISSN:
0268-2575
Resumen:
The behaviour of a continuous undivided electrochemical reactor with a rotating cylinder electrode under potenciostatic control is examined for the abatement of cadmium from synthetic sodium sulfate solutions with Cd(II) concentrations lower than 500 mg.dm-3 at a reactor inlet pH=7. The process was designed to convert the metal ions in solution to metal powder, which settles to the conical of the reactor and may be removed at intervals as a sludge by opening a drop valve. The effect of applied potential, inlet cadmium concentration, rotation speed and hydrogen evolution as side for cathodic reaction on the figures of merit of the reactor are analyzad. The best results were obtained for cathodic potential in the range from -0.9V to -1.0V against the saturated calomel electrode. Therefore, when the rotation speed was 1000 rpm the space time yield and the normalizad space velocity were 0.64x102 mol.m-3.s-1 and 0.89 h-1 respectively, while the fractional conversion per pass was 35% with a current efficiency higher than 74%. The surface morphology of the deposits as a function of the process variables is also reported