فهرست مطالب مرضیه دهقان طزرجانی

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.

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%.