Designing a simple electrochemical method for ozone generation and using for removal of C.I. Reactive blue 203 (RB 203) from textile wastewater

Abstract

Textile wastewater is one of the most important environmental pollutants. These wastewaters are containing different kinds of dyes, chemicals and salts. Therefore, it is essential to remove these dyes and chemicals from wastewaters before discharging them into the environment. One of the best methods to remove these dyes and chemicals from wastewater is using oxidation agents such as H2O2, O3 and etc. Ozone is an important oxidizing agent which is widely used in the purification of water, wastewater treatment, water disinfection and decomposition of organic materials. The main aim of this study is the investigation of the removal of C. I. Reactive Blue RB 203 as a textile dye from aqueous solutions by using electrochemical ozone generation with a titanium anode electrode modified with a mixture of nickel, antimony and tin oxides. Some parameters such as the pH of the solution, current density and ozonation time were optimized. The textile dye concentration during the degradation process was estimated from the calibration curve (the UV-Vis absorption values versus the dye concentration) and also the kinetic order of the removal of RB 203 was investigated. The results showed that removal of the dye (100 ppm) from the solution increased by increasing ozonation time at a constant current density of 20 mA/cm2 for 40 min electrolysis and also it was removed from solutions with an efficiency of 99%.

Keywords

• electrochemical ozone generation
• modified titanium electrode
• wastewater treatment
• degradation of textile dye
• c.i. reactive blue 203 (rb 203)