| Full text | |
| Author(s): |
Total Authors: 3
|
| Affiliation: | [1] Univ Sao Paulo, Dept Chem Engn, Av Prof Lineu Prestes 580, Bloco 18 Conjunto Quim, BR-05434070 Sao Paulo, SP - Brazil
Total Affiliations: 1
|
| Document type: | Journal article |
| Source: | Separation and Purification Technology; v. 193, p. 184-192, MAR 20 2018. |
| Web of Science Citations: | 5 |
| Abstract | |
The transport properties of the heterogeneous HDX 100 and homogeneous PC-SK membranes were evaluated by chronopotentiometry for the treatment of the cyanide-free electroplating wastewater with copper ions in acid medium and they were related to the membranes morphology. It was determined the fraction of conductive area, limiting current density, ohmic resistance, plateau length and transport number for both membranes in different Cu2+ concentrations (0.1; 0.5, 1.0, 1.5 and 2.0 g/L) in pH 3. Typical current-voltage and chronopotentiometric curves of monopolar membranes were constructed and the obtained results showed that the PC-SK achieved a local concentration of cupric ions at the conductive regions greater than HDX and it affected some transport properties as the ohmic resistance. In addition, chronopotentiometric curves of a concentrated solution with 5 g Cu2+/L were also constructed and only the curves of PC-SK showed an additional inflexion point typical for bipolar membranes. Besides, a large amount of a blue solid material was formed and visually observed at the end of the experiment only with PC-SK and it is related to its homogeneity, low fraction of conducting regions, water content, and ion exchange capacity. (AU) | |
| FAPESP's process: | 12/51871-9 - Study Center for Technology in Waste Solid Treatment and Recycling - SCTWSTR |
| Grantee: | Jorge Alberto Soares Tenório |
| Support type: | Research Projects - Thematic Grants |
| FAPESP's process: | 14/13351-9 - Treatment of effluents from cyanide-free electroplating processes by electrodialysis for recovering of water and inputs |
| Grantee: | Tatiana Scarazzato |
| Support type: | Scholarships in Brazil - Doctorate |