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Abstract
A new wood-flour-based photocatalytic composite of wood flour/β-cyclodextrin/titanium dioxide (WF/β-CD/TiO2) was synthesized via the photoinduced assembly method. For evaluation of the photocatalytic efficiency of methyl orange (MO) by WF/β-CD/TiO2, three materials of TiO2, β-CD/TiO2 and WF/TiO2 were prepared and assessed under the same photocatalytic conditions. The morphology of these composites was characterized by scanning electron microscope (SEM) and transmission electron microscope (TEM), respectively. The chemical composition was detected by X-ray photoelectron spectroscopy (XPS). By means of phenolphthalein probe technique and back titration method, the contents of active β-CD (3.5 %) and TiO2 (0.0581 g/0.1 g) in the prepared WF/β-CD/TiO2 composite were obtained. In the experiments of photocatalytic reaction, for completely degradation of 0.1 mmol L−1 MO, the degradation time of WF/β-CD/TiO2 was similar to that of β-CD/TiO2 but shorter than those degraded by pure TiO2 and WF/TiO2. The kinetics of photocatalytic degradation of MO by WF/β-CD/TiO2 was also investigated. The intraparticle diffusion kinetic model gave a better correlation for the photocatalytic reaction. In addition, after recycling for five times, the degradation efficiency of MO by WF/β-CD/TiO2 was still above 86 %, which was obviously higher than that by WF/TiO2, indicating a good regeneration property.
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