Response Surface Methodology for Optimization and Modeling of Photo-Degradation of Alizarin Cyanine Green and Acid Orange 7 Dyes Using UV/TiO2 Process

Abstract

Textile and dyes industries are generating huge amount of waste water contains significant amount of dyes which are toxic and hazardous for the environment. Recently, advanced oxidation processes (AOPs) have considerable attention because it offers an attractive method for degradation of organic compounds and color from wastewater. The present work is focused on the heterogeneous photocatalytic degradation of Alizarin Cyanine Green and Acid Orange 7 dye using UV/TiO2 process. The degradation of dyes is strongly dependent on the various operational parameters like initial concentration of dye, pH and loading of TiO2. The kinetics of degradation of dye in the solutions was found to pseudo first order kinetics. A statistical technique response surface methodology was employed to study the influence of various operational parameters on degradation efficiency. Three-factor-three-level Face Centered Design was used for design of experiments. For 100 mg/L concentration of Alizarin Cyanine Green and Acid Orange 7 dyes, the optimum parameters were found to be 1.2 gm/L and 1.4 gm/L TiO2 loading for maximum degradation of 97% and 65% respectively.