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Influences of the operational variables on electrochemical treatment of chelated Cu(II) in alkaline solutions using a membrane cell
Mid Sweden University, Faculty of Science, Technology and Media, Department of Chemical Engineering. (FSCN (Surface and Colloid Chemistry))
Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences. (FSCN (Materials Physics))
Mid Sweden University, Faculty of Science, Technology and Media, Department of Chemical Engineering. (FSCN (Surface and Colloid Chemistry))ORCID iD: 0000-0003-3407-7973
Mid Sweden University, Faculty of Science, Technology and Media, Department of Chemical Engineering. (FSCN (Surface and Colloid Chemistry))
2017 (English)In: Journal of chemical technology and biotechnology (1986), ISSN 0268-2575, E-ISSN 1097-4660, Vol. 92, no 6, p. 1436-1445Article in journal, Editorial material (Refereed) Published
Abstract [en]

BACKGROUND

The electrochemical recovery of copper and chelating agent from their complex solution using a membrane flow cell was investigated. The parameters electrolysis time, solution pH, current density, and temperature were investigated.

RESULTS

Electrochemical investigation indicated that chelating ligands can be recovered by the electrodeposition of copper ions on the cathode. For copper and EDTA recovery, the results indicated that recovery efficiency was affected by time, current density, and temperature. The recovery process was not influenced by pH in the range studied (pH 8–12), which can be explained by the low variation in the conditional stability constant, i.e. Δlog10 K' ≤ 0.7, over the pH range. However, when NTA, EDTA, and DTPA were compared, the results indicated that the recovery efficiency decreased as the conditional stability constant of the chelating agent–Cu(II) complex increased. The maximum current efficiency of copper and EDTA recovery after 5 h of treatment was approximately 85%, whereas the recovery was 80% of the initial concentration (0.05 mol L−1) at a current density of 1 A dm−2, temperature of 333 K, and pH of 10.

CONCLUSION

Relatively high recovery efficiency makes the process fairly sustainable and hinders the discharge of copper ions and chelating ligands as pollutants into the environment. 

Place, publisher, year, edition, pages
2017. Vol. 92, no 6, p. 1436-1445
Keywords [en]
electrochemistry, heavy metals, recovery, waste-water, hydrometallurgy
National Category
Chemical Sciences
Identifiers
URN: urn:nbn:se:miun:diva-29558DOI: 10.1002/jctb.5141ISI: 000403025100035Scopus ID: 2-s2.0-85006827367OAI: oai:DiVA.org:miun-29558DiVA, id: diva2:1056158
Available from: 2016-12-14 Created: 2016-12-14 Last updated: 2018-06-28Bibliographically approved
In thesis
1. Metal-Chelate Complexes in Alkaline Solution: On Recovery Techniques and Cellulose-based Hybrid Material Synthesis
Open this publication in new window or tab >>Metal-Chelate Complexes in Alkaline Solution: On Recovery Techniques and Cellulose-based Hybrid Material Synthesis
2018 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

For decades, aminopolycarboxylate chelating agents have been extensively used in various industrial applications. The ability of chelating agents to form stable metal-chelate complexes is the main reason for using them to manage metal ions within water-based industrial processes. Considerable quantities of industrial effluent containing chelating agents and heavy metals are produced and often discharged into the environment. The toxicity of heavy metals and the non-biodegradability of the chelating agents, as well as their accumulation in the environment, has become cause for concern. The main purpose of this thesis was to evaluate and develop processes for recovery of chelated metal complexes from aqueous solution. In this regard, the membrane electrolysis technique was evaluated for recovery of copper and aminopolycarboxylic chelating ligands such as ethylenediaminetetraacetic acid (EDTA), nitrilotriacetic acid (NTA), diethylenetriaminepentaacetic acid (DTPA), and a surface-active derivative of DTPA, 2-dodecyldiethylenetriaminepentaacetic acid (C12-DTPA) from aqueous solution. By using this method, it was possible to simultaneously recover the chelating ligand for further reuse and collect the metals by electrodeposition, making the process more cost-effective and hindering the discharge of copper ions and chelating ligands as pollutants into the environment. In addition, the ion flotation technique with the chelating surfactant C12-DTPA could be employed to separate metal ions, especially from their dilute solutions, and concentrate them in a foam phase. This is because C12-DTPA has a purpose-built functionality; besides forming strong coordination complexes with metal ions, it is also surface-active and will readily adsorb at air-water interfaces. In this study, C12-DTPA was effectively used in combination with foaming agents for the removal of toxic metal ions such as Cd2+, Zn2+, and Sr2+ from aqueous solution using ion flotation. From an economical perspective, this method could be combined with the membrane electrolysis technique to recover metal and regenerate chelating surfactant so that it can be reused.

The present work also shows the synthesis of metal and metal oxide(s) nanoparticles (NPs) in alkaline aqueous solution containing chelated metal ions, in order to fabricate metal NPs–cellulose hybrid materials. Cellulose is the most abundant renewable material, with good mechanical performance and chemical resistivity in a wide range of solvents, which makes it a promising material to support metal NPs. In this respect, we developed a rapid and inexpensive one-pot synthesis of spherical copper NPs in a cellulose matrix. The hybrid material displayed antibacterial properties for both the gram-negative and gram-positive bacteria. The synthesis was further developed by studying the influence of various chelating ligands and surfactants on the NPs’ morphology and chemical composition. According to the results, DDAO, a zwitterionic surfactant, was found to mediate the formation of pure octahedral Cu2O NPs. In addition, a hybrid material film composed of regenerated cellulose and synthesized Cu2O nano-octahedrons was fabricated by spin-coating.

Place, publisher, year, edition, pages
Sundsvall: Mid Sweden University, 2018. p. 68
Series
Mid Sweden University doctoral thesis, ISSN 1652-893X ; 282
National Category
Other Chemical Engineering
Identifiers
urn:nbn:se:miun:diva-33975 (URN)978-91-88527-54-7 (ISBN)
Public defence
2018-06-05, M102, Sundsvall, 13:00 (English)
Opponent
Supervisors
Available from: 2018-06-28 Created: 2018-06-28 Last updated: 2018-06-28Bibliographically approved

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Eivazihollagh, AlirezaBäckström, JoakimNorgren, MagnusEdlund, Håkan

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Journal of chemical technology and biotechnology (1986)
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