Electrochemical ozone production using Ti/TNT/SnO۲-Sb۲O۵-NiO-CNTElectrode for degradation of toxic textile

Textile wastewater is one of the most important environmental pollutants. These wastewaters arecontaining different kinds of dyes, chemicals and salts. Therefore, it is required to remove thesedyes and chemicals from wastewaters before discharging them into the environment. One of thebest methods to remove these dyes and chemicals from wastewater is using oxidation agents suchas H۲O۲, O۳ and etc. Ozone is an important and ecofriendly oxidizing agent that is widely used inthe purification of wastewater, water disinfection and decomposition of organic materials [۱-۳].The main aim of this study is the investigation of the textile wastewater treatment containingdisperse yellow ۲۱۱ by using electrochemical ozone generation with a titanium anode electrodemodified with a mixture of nickel, antimony and tin oxides. Some parameters such as the repetitioncoating time, current density, type, and the electrolyte concentration were optimized to be ۱۸, ۱۵mA cm-۲, HClO۴ ۰.۱ M, respectively. Then by use of UV-Vis spectroscopy, the concentration ofsoluble ozone was determined ۹.۲۸ mg L-۱. and finally, the kinetics of the removal of disperseyellow ۲۱۱ was investigated. The results showed that removal of the dye (۱۰۰ ppm) from thesolution increased by increasing ozonation time at a constant current density of ۱۵ mA/cm۲ for ۹۰min electrolysis and it was removed from solutions with an efficiency of ۹۸%.