Removal of organic dye pollutants from wastewater by electrochemical oxidation

Abstract

The removal of chemical oxygen demand (COD) and color from simulated dye wastewater containing organic dyes, direct yellow 4, C 26 H 20 N 4 O 8 S 2 Na 2 and acid yellow 17, C 16 H 10 O 7 N 4 S 2 Cl 2 Na 2 experimentally investigated using an electrochemical undivided cell reactor with Pt as anode and steel as cathode. Particular attention was paid to probe the effect of supporting electrolyte (NH 4 Cl), cell voltage, pH, and treatment time on the electrochemical treatment efficiency. Experiments were also carried out using 0.2 M NH 4 Cl as supporting electrolyte under the condition of free pH. The experimental results showed that the process could efficiently remove the color and COD from simulated dye waste water. The overall COD removal reached at 69.9% by using supporting electrolyte and increasing voltage. The process can be described by pseudo first-order kinetics for the removal of COD.

Polypyrrole-Chitosan-CaFe2O4 Layer Sensor for Detection of Anionic and Cationic Dye Using Surface Plasmon Resonance

“…The PPy-Chi-CaFe 2 O 4 composite layer was prepared in different thicknesses in the range of 2.8 nm to 59.5 nm using Figure 6: The FT-IR results related to PPy-Chi-CaFe 2 O 4 sensing layer after the interaction with (a) MB and (b) MO. 7 International Journal of Polymer Science the electrodeposition technique. The composite layer was characterized with analytical methods including the FT-IR, FE-SEM, and XRD techniques, and they confirmed the CaFe 2 O 4 was formed in the polypyrrole and chitosan composite.…”

“…Many methods that are based on biological [5], chemical, and physical properties of materials [6] have been used to degrade MO and MB. The conventional methods including electrooxidation [7], electro-Fenton [8], adsorption [9], ozone [10], photocatalytic [11], and reverse osmosis [12]. The electrooxidation method is an attractive technique used to treat textile effluents [13], while decontamination of the wastewater depends on the work electrodes in electrochemical reactors [14].…”

Electrochemical Oxidation Processes for the Treatment of Organic Pollutants in Water: Performance Evaluation Using Different Figures of Merit

“…In contrast, in the study of Silva et al, which showed the first-order removal of TOC, EE/M exhibited far greater variations with time (31–37%) than EE/O (6–11%) . However, by high current operations for utilizing the oxidant generation reaction, pollutant removal generally follows first-order kinetics in most EOPs, where the use of EE/O is practically appropriate. − More details about the dependences of EE/O and EE/M on the operating parameters (including initial organic load and j ) are provided in the subsequent sections.…”

Textiles

“…Optimized conditions under specified cost driven constraints were obtained at 6.7 mA/cm 2 , 5.9 mA/cm 2 and 5.4 mA/cm 2 current density and 3.1 g/L, 2.5 g/L and 2.8 g/L NaCl concentration for Levafix Blue CA, Levafix Red CA and Levafix Yellow CA reactive textile dyes, respectively. Parsa and Shojaat (2007) (NH 4 Cl) and increasing cell voltage. Szpyrkowicz and Radaelli (2007) studied and proposed the electro-oxidation of a spent dyeing bath, mediated by the Cl -/Cl 2 redox couple, as a technology alternative to hypochlorite oxidation.…”