光谱学与光谱分析 |
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Preparation and Characterization of Modified Kaolins and Their Photocatalytic Property |
WANG Ding, JIAN Li, CHENG Lin, MA Hui-yan, ZHANG Qian-cheng* |
Key Lab of Industrial Catalysis of the Inner Mongolia Autonomous Region, Inner Mongolia University of Technology, Huhhot 010051, China |
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Abstract In order to develop the cheap and efficient photocatalysts, kaolins were modified through calcination and acid leaching. In succession, the prepared samples were characterized using thermal gravimetric-differential thermal analysis (TG-DTA), scanning electron microscope (SEM) coupled with energy dispersive spectroscopy (EDS), X-ray diffraction (XRD), ultraviolet-visible spectroscopy (UV-Vis) and BET specific surface area measurements (BET). Methyl orange, used as a model reactant, was degraded under UV light irradiation to evaluate the photocatalytic activities of the prepared samples. From UV-Vis spectroscopy analyses, an obvious increase in the red shift of the absorption edge was observed for the samples treated with acid. The acid sites generated during the modification of kaolin were determined through adsorbed pyridine analysis using infrared spectroscopy (Py-IR). Kaolins modified using over 30% H2SO4 contained both Brnsted and Lewis acid sites. Combining the results of photocatalytic experiment with the conclusions of Py-IR and XRD, the acid properties of the prepared samples were the main factors that affected their catalytic activity.
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Received: 2012-02-25
Accepted: 2012-06-10
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Corresponding Authors:
ZHANG Qian-cheng
E-mail: jzhang@imut.edu.cn
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