Electrochemical Degradation of Industrial Dyes in Wastewater through the Dissolution of Aluminum Sacrificial Anode of Cu/Al Macro-Corrosion Galvanic Cell

Abstract

This paper reports on the process of industrial-type wastewater purification carried-out through continuous anodic dissolution of aluminum alloy sacrificial anode for artificially aerated Cu-Al alloy galvanic (macro-corrosion) cells and synthetically prepared wastewater solutions. Electrochemical experiments were performed by means of a laboratory size electrolyzer unit, where the electrocoagulation process along with surface-induced electrooxidation phenomena were examined for wastewater containing Acid Mixture and Disperse Red 167 dyes. Final reduction of the dyes concentrations came to 32 and 99% for Acid Mixture and Disperse Red 167, correspondingly. The above was visualized through the employment of electrochemical (cyclic voltammetry and a.c. impedance spectroscopy techniques) and instrumental spectroscopy analyses.

Electrodegradation of Acid Mixture Dye through the Employment of Cu/Fe Macro-Corrosion Galvanic Cell in Na2SO4 Synthetic Wastewater

“…In this study, the wastewater electrocoagulation/electrooxidation unit was composed of ca. 300 mL glass-made electrochemical reactor (see Figure 9 in [ 23 ]) and electrodes, which were arranged in a single Fe sacrificial anode placed between two Cu cathodes. A cylindrically shaped Fe mild steel was used as a sacrificial anode with an effective surface area of 29.3 cm 2 (diameter Φ = 3.5 cm, thickness: d = 1 cm) (DIN C15 (1.0401), ArcelorMittal, Dąbrowa Górnicza, Poland) and cathodes were made of cylindrically shaped copper with a total effective electrode area of 84 cm 2 (two plates 4 × 5 × 0.1 cm).…”

“…All procedures for the preparation of Cu and Fe electrodes, as well as electrochemical cell and working solutions’ preparation, employed electrochemical instrumentation and methodologies (cyclic voltammetry and ac impedance spectroscopy), and the UV-Vis spectroscopy analyses were as those recently reported in [ 23 , 43 ] from this laboratory. The electrolyte pH, dissolved oxygen concentration, and conductivity evaluations were performed with pHenomenal ® pH 1100 L, pHenomenal ® OX 4100 L, and pHenomenal ® CO 3100 L meters from VWR, correspondingly.…”

“…As compared with formerly described dc-powered methods, the latter design eliminates the presence of expensive dc. infrastructure and electronic control systems, and also radically reduces total consumption of electricity upon wastewater purification (see recently published work by Łuba et al from this laboratory on Cu/Al alloy galvanic cell-based dye purification in [ 23 ]).…”

Coordination framework materials fabricated by the self-assembly of Sn(iv) porphyrins with Ag(i) ions for the photocatalytic degradation of organic dyes in wastewater

“…1–4 Environmentalists and researchers have been challenged to provide an effective remediation of these toxic compounds. For this purpose, various scientific techniques, such as adsorption, 5 ion exchange, 6 chemical precipitation, 7 electrolysis, 8 membrane filtration, 9 and advanced oxidation processes (AOPs), 10 have been used.…”

Sn(IV) Porphyrin-Based Ionic Self-Assembled Nanostructures and Their Application in Visible Light Photo-Degradation of Malachite Green

“…Large quantities of organic dyes, herbicides, phenols, pesticides, plasticizers, biphenyls, amino, and nitro compounds are discharged into water bodies, endangering aquatic life and water potability [1,2]. Several methods to remove hazardous pollutants from wastewater have been reported, including those based on physicochemical techniques, such as adsorption [3], membrane filtration [4], ion-exchange [5], chemical precipitation [6], electrolysis [7], and advanced oxidation processes (AOPs) [8]. Among them, AOPs are the most commonly used methods owing to their simple operation, high degradation rate without the generation of secondary pollutants, and degradation of the entire pollutant to less-toxic compounds (CO 2 and H 2 O).…”