Document Type : Original Article

Authors

• Masoud Rismanchian ¹
• Samira Barakat ²
• Mahnaz Shakerian ²
• Reza Keshavarzi ³
• Nima Khoshzat ¹

¹ Department of Occupational Health Engineering, Isfahan University of Medical Sciences, Isfahan, Iran

² Student Research Center, School of Health, Isfahan University of Medical Sciences, Isfahan, Iran

³ Department of Chemistry, School of Chemistry, University of Isfahan, Isfahan, Iran

Abstract

Aims: This study was aimed to determine the TiO ₂ /zeolite photocatalytic activity for removing red Safranin dye form aqueous phase. Materials and Methods: In this study, TiO ₂ nanoparticles were produced using sol-gel method and 2.5 ml sol-gel was coated on 1.2222 g of zeolite. X-ray diffraction (XRD) and scanning electron microscopy (SEM) were applied to specify the structure and morphology of TiO ₂ nanoparticles. The effect of TiO ₂ coating on zeolite, ultraviolet (UV) radiation intensity, initial concentration of dye and the type of photocatalyst substrate (fixed and moving) on photocatalytic process was investigated. Results: According to XRD results, the TiO ₂ nanoparticles had two phases including anatase (80.5%) and rutile (19.5%). The uniformity of nanoparticles was obvious in the SEM images. The removal efficiency of TiO ₂ coated on zeolite was higher than TiO ₂ photocatalysis with increasing UV radiation intensity from 2.4 w/m ² to 3.9 w/m ² , the photocatalytic efficiency was also enhanced. The removal efficiency decreased from 91.61% to 77.91% by increasing the red Safranin dye concentration from 10 mg/L to 50 mg/L. The moving bed of TiO ₂ /zeolite photocatalyst had a higher efficiency than the fixed bed. Conclusion: In over all, the TiO ₂ /zeolite photocatalyst was much more effective than TiO ₂ photocatalyst for Safranin dye removal from the aqueous phase. With increasing UV radiation intensity and decreasing dye concentration photocatalytic efficiency, was improved. TiO ₂ /zeolite photocatalyst with fixed bed is recommended to be used in water treatment. The most important problem of using moving-bed TiO ₂ /zeolite photocatalyst in the water treatment is opacity.

Keywords

• Photocatalyst
• red Safranin dye
• TiO2 nanoparticles
• ultraviolet radiation
• zeolite