摘要
Composite photocatalyst of TiOg/Hangjin 2# clay has been used as a carrier for the composite photocatalyst due to its low cost prepared by acid-catalyzed sol-gel method. Hangjin 2# clay was and abundant reserves in Inner Mongolia, China. The samples were characterized by X-ray diffraction （XRD）, Fourier transformed infrared spectroscopy （FT-IR）, scanning electron microscopy （SEM） and Brunauer-Emmett-Teller （BET） specific surface area measurements. XRD patterns proved that anatase and rutile phases were coexisted with 52% anatase and 48% ruffle for the TiO2 in the composite. FT-IR analysis demonstrated that the insertion of TiO2 in composite photocatalyst did not destroy the basal framework structure of the clay. SEM results proved the addition of Hangjin 2# clay restrained TiO2 grain growth and the grain size in the composite was smaller than that of pure TiO2 in the same process. Photocatalytic characteristics of TiO2/Hangiin 2~ clay composites were evaluated by measuring degradation ratio of methylene blue （MB） in aqueous solution under ultraviolet （UV） irradiation. Effects of TiO2 wt%, gelling temperature and heat-treating temperature on the photocatalytic activity of the composites were investigated. The composite catalyst showed higher photocatalytic activity than the pure TiO2 under the same experimental conditions. In addition, the composite photocatalysts were easier to recover and reuse than pure TiO2 samples.
基金
This work was supported by the National Natural Science Foundation of China （No： 60671010, 20775045） and Natural Science Foundation of Shandong Province （Y2006B29）. The authors are grateful to College of Chemistry and Environment, Inner Mongolia Normal University for providing Hangjin 2# clay.
