Removal of textile dye of red acid 361 using ozone produced at modified titanium electrode with metal oxide and multi walled carbon nanotubes

Document Type : Original Article


1 Faculty of Engineering, Department of Textile Engineering, Yazd University, Yazd, Iran

2 Faculty of Basic Sciences, Department of Chemistry, Yazd University, Yazd, Iran


One of the most challenges in the textile dyeing industry is produced toxic and contaminated effluents, which must remove these toxic compounds from wastewaters before discharging them into the sewerage. One of the best methods for removing these toxic maters is to use oxidant material such as ozone. Recently, electrochemical ozone generation has been considered a simple, inexpensive and effective process. In this research the removal of C. I acid red 361 with azo structure as a widely used in the carpet industry, remove it from effluent less attention, were removed by an electrochemical method with titanium modified with tin oxide doped with antimony, Nickel and carbon nanotubes. The surface of the titanium electrode was coated with a mixture of salts (tin, antimony and nickel) and carbon nanotubes by spin-coating and pyrolysis method. The cyclic voltammetry technique was used to compare the anodic current and the initiation potential of water splitting on the bare and modified electrodes. The UV-Vis technique was used to confirm ozone production on bare and modified electrodes. Removal of C. I acid red 361 from dye solution was performed with the modified electrode at a constant current density of 20 mA cm-2 at different times. Parameters such as initial dye concentration, contact time, pH and dye degradation kinetics were investigated. The results showed that the removal of C. I acid red 361 from the solution increased with increasing contact time with ozone so that during 30 minutes electrolysis of dye degradation was performed with an initial concentration of 100 ppm with 99% efficiency.


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