Research on Photocatalytic Degradation of Methyl Orange by a β-Cyclodextrin/Titanium Dioxide Composite

doi:10.21127/yaoyigc20170007

Abstract

Abstract:

A photocatalytic composite of β-cyclodextrin/titanium dioxide (β-CD/TiO₂) was synthesized via the photoinduced assembly method in this work. The morphology of the composite was characterized by scanning electron microscope (SEM) and transmission electron microscopy (TEM), respectively. The chemical composition was detected by fourier transform infrared spectroscopy (FTIR). By means of phenolphthalein probe technique and back titration method, the contents of active β-CD (2.0%) and TiO₂ (0.0971±0.0006 g/0.1 g) in the prepared β-CD/TiO₂ composite were obtained. In order to investigate deeply the role of β-CD in TiO₂ photocatalytic system, 100 mL of 0.1 mmol L^-1 methyl orange (MO) aqueous solution was used as the organic pollutant, the photocatalytic activity of β-CD/TiO₂ and pure TiO₂ were assessed under the same conditions. The results showed that the degradation time of β-CD/TiO₂ was 43% shorter than that degraded by the aqueous solution containing only TiO₂. β-CD/TiO₂ demonstrated a better photocatalytic activity. The kinetics of photocatalytic degradation of MO by β-CD/TiO₂ and pure TiO₂ was studied. In addition, the degradation efficiency of MO by β-CD/TiO₂ was still above 85% after recycling for 5 times.

Key words: β-cyclodextrin, titanium dioxide, methyl orange, mechanism, photocatalytic degradation

Shuting Lu, Nan Sun, Ting Wang. Research on Photocatalytic Degradation of Methyl Orange by a β-Cyclodextrin/Titanium Dioxide Composite[J]. General Chemistry, 2017, 3(3): 164-169.

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