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Chemistry in Industry : Journal of Chemists and Chemical Engineers of Croatia, Vol. 73 No. 3-4 (special issue), 2024.

Original scientific paper

https://doi.org/10.15255/KUI.2023.039

Removal of Crystal Violet Dye by Electrocoagulation – Analysis of Electrode and Solution Changes

Senka Gudić ; University of Split, Faculty of Chemistry and Technology, Ruđera Boškovića 35, 21000 Split, Croatia *
Ladislav Vrsalović orcid id orcid.org/0000-0001-6111-5475 ; University of Split, Faculty of Chemistry and Technology, Ruđera Boškovića 35, 21000 Split, Croatia
Nediljka Vukojević Medvidović orcid id orcid.org/0000-0002-8646-4249 ; University of Split, Faculty of Chemistry and Technology, Ruđera Boškovića 35, 21000 Split, Croatia
Sandra Svilović orcid id orcid.org/0000-0003-0300-8932 ; University of Split, Faculty of Chemistry and Technology, Ruđera Boškovića 35, 21000 Split, Croatia
Silvia Ivančić ; University of Split, Faculty of Chemistry and Technology, Ruđera Boškovića 35, 21000 Split, Croatia

* Corresponding author.

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Abstract

This study investigates the changes at the electrodes and in the solution during crystal violet dye removal by electrocoagulation at different current densities (0.016, 0.024, and 0.032 A cm–2) and initial pH values (3.2, 5.5, and 7.0). The electrocoagulation process, which lasted 50 min, revealed changes in pH, temperature, electrical conductivity, and concentration of the crystal violet dye in the solution. The results demonstrate complete removal of crystal violet dye at the highest current density (achieved after 40 min) and an initial pH of 5.5 (complete removal after 30 min). During the electrocoagulation process, both the anodic and cathodic electrode materials were consumed. The consumption of electrode material increased with higher current density and solution pH, the influence of current density being more pronounced. Examination of the electrode surfaces under a light microscope revealed that the anodes dissolved uniformly and locally during the electrocoagulation process, while the cathodes mostly underwent uniform corrosion.

Keywords

electrocoagulation; electrodes corrosion analysis; initial current density; initial pH; crystal violet dye removal

Hrčak ID:

315015

URI

https://hrcak.srce.hr/315015

Publication date:

11.3.2024.

Article data in other languages: croatian

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