Enhanced photocatalytic activity of titanium dioxide by β-cyclodextrin in decoloration of Acid Yellow 99 dye

Abstract

Photocatalytic decoloration of Acid Yellow 99 dye by TiO₂ has been investigated under different experimental conditions. Addition of β-Cyclodextrin on TiO₂ enhanced the photoactivity of TiO₂ in AY99 degradation. Optimal experimental conditions on catalyst amount, pH value, illumination time, and dye concentration have been determined. The mineralization of AY99 has been confirmed by Chemical Oxygen Demand measurements. The higher photoactivity of TiO₂-β-CD/visible light system than TiO₂/visible light system can be ascribed due to the ligand to metal charge transfer from β-CD to Ti^IV located in an octahedral coordination environment. The complexation patterns have been confirmed with UV–Visible and FT-IR spectral data. The interactions between TiO₂ and β-CD have been characterized by Field Emission Scanning Electron Microscopy, X-ray powder diffraction analysis, and UV–Visible diffuse reflectance spectroscopy.

Keywords:

• Acid Yellow 99 dye
• β-Cyclodextrin
• TiO₂
• Photocatalytic decoloration
• COD

View correction statement:

Enhanced photocatalytic activity of titanium dioxide by β-cyclodextrin in decoloration of Acid Yellow 99 dye

Acknowledgments

The authors thank the Management and the Principal of Ayya Nadar Janaki Ammal College, Sivakasi, Tamilnadu, India for providing necessary facilities. Authors also thank the University Grants Commission, New Delhi, for the financial support through UGC-Major Research Project Ref. [UGC - Ref. No.F. No. 38-22/2009 (SR) Dated: 19.12.2009]. The instrumentation centre, Ayya Nadar Janaki Ammal College, Sivakasi, Centre for Nanoscience and Nanotechnology, Bharathidasan University, Tiruchirappalli, and Department of Earthscience, Pondicherry University, Pondicherry are highly appreciated for recording the UV–Visible, FT-IR spectra, FESEM, and Powder XRD patterns, respectively.