Photocatalytic degradation of acid red 14 from contaminated water using immobilized TiO₂ nanoparticles on glass beads activated by UV/peroxydisulfate

Abstract

The present study investigates the photocatalytic degradation of C. I. acid red 14 (AR 14) as a textile dye, in aqueous medium using immobilized TiO₂ nanopowder on glass beads illuminated by a UV-C lamp (30 W). Photocatalytic degradation of organic pollutants is done with photogenerated holes as a result of UV light irradiation on surface of TiO₂ nanoparticles and generation of hydroxyl radicals as power oxidant. This process is performed under a set of variables (concentration of peroxydisulfate, AR 14, and temperature). AR 14 photocatalytic degradation increased with increasing peroxydisulfate concentration and temperature. The increase in dye concentration caused a decrease in removal efficiency. The progress of photocatalytic decolorization of the AR 14 was studied by measuring the absorbance at λ_max = 514 nm by UV–Vis spectrophotometer. The results indicated no observable loss of the color when the UV or UV/TiO₂ was applied in the absence of . The results reveal that a considerable decrease in the concentration of the dye occurs when the sample was photocatalytic degraded by .

Keywords:

• Advanced oxidation process
• C. I. acid red 14
• Immobilized TiO₂ nanoparticles
• UV irradiation
• Wastewater treatment

Acknowledgements

The authors thank the University of Zanjan and Islamic Azad University of Tabriz Branch, Iran for financial and other supports.