Abstract
TiO2 was supported on HZSM-5 using a sol-gel method. Anatase TiO2 phase is found in both pure TiO2 and the supported x%TiO2/HZSM-5 samples. The well distribution of TiO2 on the surface of HZSM-5 leads to shrinking crystallite size of anatase TiO2. After loading TiO2 on HZSM-5, surface area of the composite x%TiO2/HZSM-5 becomes much larger than that of pure TiO2. The 50%TiO2/HZSM-5 sample contains comparatively small pores in a narrow pore size range between 5-14 nm. The supported x%TiO2/HZSM-5 has enhanced photocatalytic activity as compared to pure TiO2. Full oxidation state of titanium does not change after loading TiO2 on HZSM-5, while electron binding energies of Ti2p1/2 and Ti2p3/2 shift to higher energy end. Photocatalytic degradation efficiency is 92.8% on 50%TiO2/HZSM-5 after 100 min of irradiation, which is much larger than the degradation efficiency of 66.1% on pure TiO2.
Keywords: HZSM-5, Methyl orange, photocatalysis; TiO2.
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