溶胶-凝胶法制备La2Ti2O7/HZSM-5及其光催化活性

doi:10.11868/j.issn.1001-4381.2015.001422

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摘要

采用溶胶-凝胶法制备La₂Ti₂O₇/HZSM-5光催化剂，并对其光催化活性进行研究。结果表明：La₂Ti₂O₇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La₂Ti₂O₇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La₂Ti₂O₇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。La₂Ti₂O₇/HZSM-5比纯La₂Ti₂O₇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%La₂Ti₂O₇/HZSM-5上的总脱色率为91.8%，而在La₂Ti₂O₇上仅为31.7%。

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	曲家惠
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	赵方昕
	杨丽丽
	张文杰

关键词 ：溶胶-凝胶, 钛酸镧, HZSM-5, 光催化

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.

Key words： sol-gel lanthanum titanate HZSM-5 photocatalysis

收稿日期: 2015-11-21 出版日期: 2017-07-21

中图分类号:

O643

基金资助: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)

通讯作者: 张文杰 E-mail: wjzhang@aliyun.com

作者简介: 张文杰(1969-), 男, 博士, 教授, 研究方向是环境净化功能材料, 联系地址:辽宁省沈阳市浑南新区沈阳理工大学环境与化学工程学院(110159), E-mail:wjzhang@aliyun.com

引用本文:

曲家惠, 都玲, 赵方昕, 杨丽丽, 张文杰. 溶胶-凝胶法制备La₂Ti₂O₇/HZSM-5及其光催化活性[J]. 材料工程, 2017, 45(7): 71-76.
Jia-hui QU, Ling DU, Fang-xin ZHAO, Li-li YANG, Wen-jie ZHANG. Sol-gel Synthesis and Photocatalytic Activity of La₂Ti₂O₇/HZSM-5. Journal of Materials Engineering, 2017, 45(7): 71-76.

链接本文:

http://jme.biam.ac.cn/CN/10.11868/j.issn.1001-4381.2015.001422 或 http://jme.biam.ac.cn/CN/Y2017/V45/I7/71

Fig.1 La₂Ti₂O₇和不同负载量的La₂Ti₂O₇/HZSM-5的XRD谱图

Fig.2 La₂Ti₂O₇及不同负载量的La₂Ti₂O₇/HZSM-5的FT-IR(a)和FT-FIR谱图(b)

Fig.3 La₂Ti₂O₇及不同负载量的La₂Ti₂O₇/HZSM-5的紫外-可见漫反射光谱图

Table 1 HZSM-5，La₂Ti₂O₇和不同负载量的La₂Ti₂O₇/HZSM-5的比表面积、孔结构和吸附量

Fig.4 La₂Ti₂O₇及70%La₂Ti₂O₇/HZSM-5的XPS谱图
(a)La3d;(b)Ti2p;(c)O1s

Fig.5 不同负载量的La₂Ti₂O₇/HZSM-5对活性艳红X-3B的降解率

Fig.6 不同光照时间时La₂Ti₂O₇(a)及70%La₂Ti₂O₇/HZSM-5(b)光催化降解活性艳红X-3B的紫外-可见吸收光谱图

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