Removal of organic dye pollutants from wastewater by electrochemical oxidation

Authors: Parsa, J. Basiri; Shojaat, R.

Source: Physics and Chemistry of Liquids, Volume 45, Number 4, August 2007 , pp. 479-485(7)

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Abstract:

The removal of chemical oxygen demand (COD) and color from simulated dye wastewater containing organic dyes, direct yellow 4, C26H20N4O8S2Na2 and acid yellow 17, C16H10O7N4S2Cl2Na2 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 (NH4Cl), cell voltage, pH, and treatment time on the electrochemical treatment efficiency. Experiments were also carried out using 0.2 M NH4Cl 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.

Keywords: Electrooxidation; Wastewater; Platinum anode; Dye; Direct yellow 4; Acid yellow 17

Document Type: Research article

DOI: http://dx.doi.org/10.1080/00319100601089752

Affiliations: 1: Chemistry Department, College of Science, Bu-Ali Sina University, Hamadan 65174, Iran

Publication date: 2007-08-01