Enhanced Photocatalytic Performance of TiO2 by β-Cyclodextrin for the Degradation of Organic Dyes

In this work, an efficient photocatalyst based on β-cyclodextrin-glycine-modified TiO2 nanoparticles(TiO2-Gly-βCD NPs) was successfully synthesized. The photocatalytic activity of the prepared TiO2-Gly-βCD was tested on the degradation of methylene blue (MB) and methyl orange (MO) dyes. The enhancedsurface properties of TiO2-Gly-βCD photocatalyst generated excellent photocatalytic performance for thephotocatalytic degradation of dyes in aqueous solution. These were strongly attributed to the presenceof the functional hydroxyl groups and the inner cores of the hydrophobic cavity in β-CD to form inclusioncomplexes with organic molecules. As compared to the pure TiO2 and TiO2 modified by Gly, the dyedegradation rate under UV irradiation was considerably enhanced by TiO2/Gly/βCD as a photocatalyst.In addition, the sonocatalytic degradation of dyes was investigated, and it was found that the ultrasonicwaves slightly enhanced the degradation time of dyes. The results indicated that the first-order kineticmodel well describes the degradation of MB and MO dyes by TiO2-Gly-βCD. Furthermore, the chemicaloxygen demand (COD) values were determined for real industrial wastewater and treated wastewater.

کلیدواژه ها:

Photocatalytic Degradation ، Surface-Modification ، TiO2 Nanoparticles ، TiO2-Gly-βCD ، Ultrasonic Degradation ، β-Cyclodextrin