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The color is a reflection of the interaction between visible light and matter. There are three criteria for color assessment such as: shades, brightness and depth (1). Azo dye Acid Red 14 is type’s of acidic dyes. This group of dyes are solutions in water, and when dissolve in water, they are negatively charged, and salts are organic acids (2). Dyes and pigments used in industries for applications such as textiles, leathers, papers, foodstuffs, additives, etc (3, 4). Azo dyes are toxic and dangerous because they have aromatic ring in their structure. The advanced oxidation processes (AOPs) methods for degradation of dyes in aqueous solution were studied by many investigators (5-8). The mixed use of CNTs and H2O2 to a certain extent A-R-T-I-C-L-EI-N-F-O A-B-S-T-R-A-C-T Article Notes: Received: Nov 28, 2017 Received in revised form: Apr 18, 2018 Accepted: Apr 28, 2018 Available Online: May 1, 2018 Background & Aims of the Study: Azo Dyes are the most hazardous materials in different industries. Dyes and pigments used in industries for applications such as textiles, leathers, papers, foodstuffs, additives, etc. Application amounts of azo dyes in industries which can cause severe health problems in human and environmental pollutant problems. So, color wastewaters decomposition plan are necessary. The purpose of this study is the application statistical experimental design in photocatalytic decomposition of azo dye Acid Red 14 (AR14) from aqueous solutions using multi walled carbon nanotubes (MWCNTs) particles which was used UV/H2O2 process in photoreactor. Materials & Methods: MWCNTs particles as a catalyst used for the degradation of dye in aqueous solution. MWCNTs particles have been characterized by scanning electron microscopy (SEM), Transmission Electron Microscopy (TEM) and Fourier transform infrared (FT-IR). Design of experimental (DOE) based design matrix was exerted for measure the effect of these three factors such as: A) pH, B) catalyst amount and C) H2O2 concentration at two levels. The full factorial experimental design was utilized in this process. The significant effects of each factor and interactions determined using analysis of variance (ANOVA) method. The decomposition kinetic of dye was studied. Results: The maximum photocatalytic degradation efficiency of dye obtained in this study was found 90.65%, corresponding to the optimal conditions of 3, 30 mg L and 20 ppm respectively, for the pH, catalyst amount and H2O2 concentration. The most effective factor in the photocatalytic degradation efficiency was H2O2 concentration. The interaction between pH×H2O2 concentrations was the most effective interaction. A pseudo first order reaction with a rate constant (k=0.0696 min) was observed for the photocatalytic degradation of dye. Conclusions: The results showed that photodegradation process can be suitable alternative to degradation dyes in aqueous solutions.

Photocatalytic Degradation of Azo Dye Acid Red 14 from Aqueous Solutions Using MWCNTs Nanocatalyst