Sol-gel Synthesis and Photocatalytic Activity of La2Ti2O7/HZSM-5
QU Jia-hui1, DU Ling1, ZHAO Fang-xin2, YANG Li-li1, ZHANG Wen-jie1
1. School of Environmental and Chemical Engineering, Shenyang Ligong University, Shenyang 110159, China;
2. School of Information Science and Engineering, Shenyang Ligong University, Shenyang 110159, China
Abstract：La2Ti2O7/HZSM-5 photocatalysts were prepared by sol-gel method, and its photocatalytic activity was studied. The results show that the original crystal phase of La2Ti2O7 is not changed after loading La2Ti2O7 on HZSM-5,and is still perovskite structure. La2Ti2O7 is dispersed on the surface of HZSM-5 after loading to apparent increasing specific surface area and formation of new mesoporous structure. The growth of La2Ti2O7 is constrainted by HZSM-5, resulting in the reduction of grain size. The absorption boundary has a blue shift and the band gap increases with decreasing La2Ti2O7 loading content. Binding energies of La3d and O1s electrons move to higher energy after loading La2Ti2O7 on HZSM-5. La2Ti2O7/HZSM-5 has enhanced photocatalytic activity as compared to La2Ti2O7. 91.8% of the reactive brilliant red(RBR) X-3B is decolorized on 70%La2Ti2O7/HZSM-5 after 120min of UV irradiation, while only 31.7% of the dye is removed on La2Ti2O7.
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