Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/65186
Type: Artigo de periódico
Title: Electrochemical Removal of Cu-II in the Presence of Humic Acid
Author: Barbosa, CP
Malpass, GRP
Miwa, DW
Gomes, L
Bertazzoli, R
Motheo, AJ
Abstract: The removal of Cu-II (10 mg L-1) complexed by commercial humic acid (100 mg L-1) was studied at different current densities (30-80 mA cm(-2)) using a filter-press cell, Ti/Ru-0.3 Ti0.7O2 anode and stainless steel cathode. The electrolyses were performed with and without membrane separating the cell compartments [(homogeneous anionic (Nafion R117), heterogeneous cationic (Ionac MC-3470) and heterogeneous anionic (Ionac MA-3475)]. The influence of the membrane on the rate of Cu-II removal was bigger for cationic membranes. Current efficiencies up to ca. 55% (Ionac MC-3470) for Cu-II removal at 30 mA cm(-2) were obtained. By combining oxidation and reduction, 100% Cu-II removal was achieved at current efficiencies of 75%. The main path for the removal is the electrostatic interaction with the anode followed by diffusion through the membrane and deposition at the cathode. Additionally, the oxidative degradation of humic acid contributes to the rate of Cu-II removal.
Subject: humic acid
copper removal
water treatment
Country: Brasil
Editor: Soc Brasileira Quimica
Rights: aberto
Identifier DOI: 10.1590/S0103-50532010000400010
Date Issue: 2010
Appears in Collections:Unicamp - Artigos e Outros Documentos

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