Electrochemical degradation of some organic dyes by electrochemical oxidation on a Pb/PbO₂electrode

Abstract

A B S T R AC TThis work investigated the electrocatalytic degradation of three types of textile dyes by electrochemical oxidation on lead dioxide anode. The infl uence of pH, current density, time of electrolysis, temperature, the conductive salt concentration and the initial dye concentrations were critically examined. The results of these infl uences are expressed in terms of the remaining organic compounds concentrations (color removal) and Chemical Oxygen Demand (COD removal). Also, both of the current effi ciency and power consumption values are calculated. In this manuscript we report that, the highest electrocatalytic activity was achieved in the presence of NaCl (3 g/l), 30 mA/cm 2 , pH of 3 and temperature of 30 °C. The highest electroactivity could be attributed to indirect oxidation of the investigated dyes by the electrogenerated hypochlorite ions formed from the chloride oxidation. In addition, contribution from direct oxidation could also be possible via reaction of these dyes with the electrogenerated hydroxyl radicals adsorbed on the lead dioxide surface.

Fabrication of cerium-doped lead dioxide anode with improved electrocatalytic activity and its application for removal of Rhodamine B

“…Therefore, chloride ions present in dyeing effluent can be effectively used by the TiO 2 -NTs/Ce-PbO 2 anode to enhance its ability to degrade RhB. By the way, the electrocatalytic performance can be further improved when using of a couple of cathode surrounding the anode [40].…”

Removal of Brilliant Green from Aqueous Solution by Electrocoagulation using Aluminum Electrodes: Experimental, Kinetics, and Modeling

“…Each of the above treatment methods have their own merits and demerits and are reported in many literatures (3,4). Among all these process, electrocoagulation (EC) is a very well-known electrochemical technique, and has been found to be an attractive alternative for the treatment of textile dyes (5)(6)(7)(8). The EC process provides a simple, ambient operable, reliable and cost-effective, ecofriendly method for the treatment of wastewater without any need for additional chemicals, and hence the secondary pollution.…”

Electrochemical decolourisation of cotton dye baths for reuse purposes: a way to reduce salinity of the textile wastewater

“…As biological treatment is insufficient to remove the colour and to accomplish with current regulations, the application of specific treatments is required. There are different techniques to achieve colour removal and among them, the most used are as follows: use of organic adsorbents [1,2], filtration with membrane [3,4], coagulation-flocculation processes [5,6], selection of microorganisms able to degrade dyes [7], application of advanced oxidation processes [8][9][10][11] or the development of electrochemical decolourisation [12][13][14]. The electrochemical decolourisation is an *Corresponding author.…”