Electrochemical Treatment of Metal Plating Wastes Using Flow-through Porous Carbon Electrodes

نویسندگان

  • R. Suzuki
  • W. Li
  • M Schwartz
چکیده

A three-dimensional, porous electrode composed of reticulated vitreous carbon (RVC) has been examined for the selective removal of metals by electrodeposition from single and multi-component solutions. A three-stage system was envisioned where each metal from a ternary mixture could be selectively removed in each stage. Single and multi-component solutions of copper, nickel, zinc and silver were tested. The metal ion concentration of each component in all the solutions was 500 ppm. The flow-through system was operated potentiostatically to selectively remove each metal. Copper, nickel and zinc were easily removed from single component solutions using the RVC electrode. Copper was selectively removed from binary mixtures with nickel and zinc without significant loss of the other metal. However nickel could not be removed from a binary mixture with zinc due to co-deposition. Copper was readily deposited from a ternary mixture of copper/nickel/zinc without loss of the other metals. Ternary mixtures of silver/copper/zinc and silver/coppednickel were tested using a three-stage system. Silver was selectively removed from each mixture without loss of other metals. Copper was also readily removed from both mixtures but with some loss of zinc in the silver/copper/zinc mixture.

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تاریخ انتشار 2003