Visible Light Driven Photocatalytic Degradation Of The Reactive Red-198, Methylene Blue And 3-chloro Phenol By Nb2O5@Zno: Synthesis And Characterization

K. Chennakesavulu1*, G. Ramanjaneya Reddy2, S. Sanjeevi Prasath3, S. Supriya1, S. Sivanesan3 

1Department of Chemistry & Centre of Excellence in Energy Research, International Research Centre,  Sathyabama University, Jeppiaar Nagar, Chennai 600 119, India

2Department of Inorganic Chemistry, School of Chemical Sciences, University of Madras,  Guindy Campus, Chennai 600 025, India

3Centre for Nanoscience and Nanotechnology, International Research Centre, Sathyabama University,  Chennai 600 119, India  

Adv. Mater. Lett., 2015, 6 (6), pp 518-526

DOI: 10.5185/amlett.2015.5776

Publication Date (Web): May 28, 2015

E-mail: chennanml@yahoo.com

Abstract


In-situ synthesis of ZnO and Nb2O5 composites was carried out in alkaline medium. The obtained composites were characterized by Fourier transform infrared spectroscopy (FTIR), Raman spectroscopy, diffuse reflectance UV-Vis spectrophotometer (DRS), Powder X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Brunauer-Emmett-Teller (BET) surface area method, N2-sorption isotherms, Thermo gravimetric analysis (TGA), Particle size  and Field emission scanning electron microscopy (FESEM/EDX). The synthesized composite was used as photocatalyst in the degradation of reactive red-198 (RR), methylene blue (MB) and 3-chloro phenol (3CP) under visible light irradiation. The catalytic activity and removal percentage of dye was determined by the spectrophotometric method, it indicates high percentage of degradation for the ZnO:Nb2O5  composite. The kinetic parameters were found to obey pseudo-first order oxidation reaction, which may be due to the fixed amount of the catalyst and concentration of the dye solution. The recycled and purified composites of  ZnO:Nb2O5 was tested the catalytic activity and  was compared with that of the fresh catalyst.

Keywords

Zinc oxide, niobium oxide, photocatalyst, visible light, reactive red198, methylene blue, chlorophen.

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