Institute for Color Science and Technology (ICST) Progress in Color, Colorants and Coatings 2008-2134 13 1 2020 02 01 γ-CD-Functionalized TiO2 Nanoparticles For the Photocatalytic Degradation of Organic Dyes 23 39 81593 10.30509/pccc.2020.81593 EN F. Shokoofehpoor Department of Chemistry, Faculty of Sciences, University of Guilan, Rasht, Iran S. H. Mousavi Department of Chemistry, Faculty of Sciences, University of Guilan, Rasht, Iran A. Mohammadi Department of Chemistry, Faculty of Sciences, University of Guilan, Rasht, Iran M. A. Zanjanchi Department of Chemistry, Faculty of Sciences, University of Guilan, Rasht, Iran Journal Article 2019 02 19 In this work, an efficient photocatalyst based on gamma-cyclodextrin-modified titanium dioxide nanoparticles (TiO2/γ-CD NPs) was synthesized and used for photocatalytic degradation of rhodamine B (RhB), methyl orange (MO) and methylene blue (MB). The results of FESEM, EDX, TEM, FT-IR, XRD and BET surface area measurement showed that the TiO2 NPs were effectively modified with γ-CD. The photocatalytic properties of the TiO2/γ-CD NPs were evaluated by the degradation of some organic dyes in aqueous solution under ultraviolet (UV) light illumination. The experimental results confirmed that the TiO2/γ-CD had exhibited efficient photocatalytic activities higher than that of the pure TiO2 in the degradation of investigated dyes. The γ-CD could increase the lifetime of the excited states of the unreactive guests and facilitate electron transfer from the excited dye to TiO2 conduction band. The results indicated that the first-order kinetic model well describes the degradation of the dyes by TiO2/γ-CD NPs. the photocatalytic reaction rate constants for RhB, MO and MB dyes in the presence of TiO2/γ-CD NPs were 4, 5.6 and 4.2 times higher than that of pure TiO2, respectively. In addition, the TiO2/γ-CD NPs can be used for several times in real application as an effective photocatalyst.

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