Decolorization of C.I. Reactive Orange 4 and Textile Effluents by Electrochemical Oxidation Technique using Silver-Carbon Composite Electrode

Abstract

In this study, the electrochemical oxidation of C. I. Reactive Orange 4 (RO4) on a silver-carbon composite (AgC-PVC) electrode was studied using the cyclic voltammetry, potential liner V, and electrolysis methods. The AgC-PVC electrode was used as the working electrode in the electrochemical measurement of RO4 in the presence of NaCl as a supporting electrolyte. The UV-Vis spectra of RO4 after the electrochemical oxidation showed the complete decolorization of the solution. The electrolysis products were characterized using FTIR and GC-MS. The results showed that in the presence of OCl -as an active oxidant, RO4 molecules are broken down into several lower-molecular-weight molecules by the electrochemical technique. The electrode used was also able to reduce the COD, BOD 5 and surfactant contents in the textile effluents using a pilot scale reactor. This proved that the prepared AgC-PVC electrode was beneficial for removing both the color and other pollutants from textile effluents.

Electrochemical Degradation of Reactive Blue 21 and Synthetic Textile Effluent by Using Co47.5/C47.5-PVC5 Composite Electrode

“…%), in which M = metal) and 0.05 g of PVC as a binder by using a mechanical alloying technique (MAT). 4 The ratio of metal and C powders to PVC was 95:5 PVC (wt. %).…”

“…The supporting electrolyte (NaCl solution) was added in the electrochemical system to modify the electrochemical conductivity and facilitate the electrical current flow. 4,25 The presence of chloride ions from the addition of NaCl can lead to active oxidant formations, such as chlorine, hypochlorous acid, and/or hypochlorite, depending on the pH (Equations 3-5). These active oxidants are beneficial in the oxidation of organic pollutants at the anode or/and in bulk solution (Equation 6).…”

“…They can be seen with the naked eye and have negatively affected the aesthetic quality and transparency of lakes, rivers, and others. 4 This in turn resulted in the destruction of aquatic ecosystems and the formation of dead deoxygenated zones in seas and oceans. 5 Therefore, the treatment of dye containing effluents is very important to reduce the negative effects on aquatic life.…”

“…It is expected that the electrode performance in the electrochemical reaction will increase as the existence of two different materials in an electrode provides better synergistic effects and active bifunctional catalyst. 4 The main objective of this study is to investigate the efficiency of Co 47.5 /C 47.5 -PVC 5 composite electrode in the decolourisation of aqueous RB21 and synthetic textile effluents. The effect of electrolysis conditions was also examined in the current study by investigating the effect of metal:graphite ratio in the prepared electrode, supporting electrolyte concentration, applied voltage, and electrolysis time on RB21 decolourisation.…”

Charcoal Base Metallic Composite Electrode for Wastewater Treatment

“…Although C50Ag20PVC30 composite electrode record color removal till 61% but the stability of electrode is low and the cost to fabricate the electrode was higher. As the main criteria electrode used in any electrochemical process should be stable chemically and physically [14,15]. Therefore, the selection of good composite electrode is not only based on the ability to remove the color, but chemical stability as well.…”