溶胶-凝胶法制备La_2Ti_2O_7/HZSM-5及其光催化活性  

Sol-gel Synthesis and Photocatalytic Activity of La_2Ti_2O_7/HZSM-5

作　　者：曲家惠 都玲[1] 赵方昕 杨丽丽[1] 张文杰[1] 

机构地区：[1]沈阳理工大学环境与化学工程学院,沈阳110159 [2]沈阳理工大学信息科学与工程学院,沈阳110159

出　　处：《材料工程》2017年第7期71-76,共6页Journal of Materials Engineering

基　　金：国家自然科学基金青年基金资助项目(51504154);辽宁省自然科学基金资助项目(2015020186)

摘　　要：采用溶胶-凝胶法制备La_2Ti_2O_7/HZSM-5光催化剂,并对其光催化活性进行研究。结果表明:La_2Ti_2O_7经HZSM-5分子筛负载后,并未改变原有晶相,仍为单斜晶系钙钛矿结构。负载后的La_2Ti_2O_7分散在分子筛表面,催化剂的比表面积大幅增加并形成新的中孔结构。HZSM-5制约了La_2Ti_2O_7的生长,导致晶粒尺寸减小。材料的光谱吸收边界随负载量的减小而发生蓝移,禁带宽度增大。负载样品中La3d和O1s的电子结合能增大。La_2Ti_2O_7/HZSM-5比纯La_2Ti_2O_7具有更高的光催化活性。经紫外光照120min后,活性艳红X-3B在70%La_2Ti_2O_7/HZSM-5上的总脱色率为91.8%,而在La_2Ti_2O_7上仅为31.7%。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.

关 键 词：溶胶-凝胶 钛酸镧 HZSM-5 光催化 

分 类 号：O643[理学—物理化学]