Electrochemical removal of CuII in the presence of humic acid

Journal of the Brazilian Chemical Society

Bertazzoli, Rodnei¹  Gomes, Luciano¹  Universidade Estadual de Campinas, Campinas, Brazil¹  Barbosa, Claudomiro P.¹  Universidade de São Paulo, São Carlos, Brazil¹  Malpass, Geoffroy R. P.¹  Miwa, Douglas W.¹  Motheo, Artur J.¹  Universidade Federal do ABC, Santo André, Brazil¹ 

关键词: humic acid;    copper removal;    water treatment;   

DOI  :  10.1590/S0103-50532010000400010

学科分类：化学（综合）

来源: SciELO

【 摘 要 】

The removal of CuII (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/Ru0.3Ti0.7O2 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 CuII removal was bigger for cationic membranes. Current efficiencies up to ca. 55% (Ionac MC-3470) for CuII removal at 30 mA cm-2 were obtained. By combining oxidation and reduction, 100% CuII 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 CuII removal.

【 授权许可】

Unknown