Preparation of lanthanum and boron co-doped TiO2 by modified sol-gel method and study their photocatalytic activity
Preparation of lanthanum and boron co-doped TiO2 by modified sol-gel method and study their photocatalytic activity
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改进溶胶-凝胶法制备镧硼共掺杂TiO2并研究其光催化活性
DOI：
10.1016/j.cattod.2013.10.062
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发表时间：
2014
期刊：
影响因子：
5.3
通讯作者：
Zhang Jinlong
中科院分区：
文献类型：
--
作者：
Lan Xi;Wang Lingzhi;Zhang Boyuan;Tian Baozhu;Zhang Jinlong
为了提高光催化反应的量子效率，扩大可见光区的吸收范围，提高可见光催化性能，采用改进的溶胶-凝胶法成功制备了镧硼共掺杂TiO 2（La-B-TiO 2）。制备的光催化剂，其特征在于通过不同的技术。结果表明，硼掺杂可以使二氧化钛的禁带宽度变窄，镧掺杂可以抑制二氧化钛的相变，阻碍二氧化钛的晶化。此外，镧的掺杂不仅增加了有机污染物在催化剂表面的吸附，而且改善了光生空穴和电子的分离，从而促进了羟基自由基的形成。以酸性橙橙子7（AO 7）为目标染料，考察了系列样品的光催化活性。与镧掺杂和硼掺杂的TiO 2样品相比，1% La-B-TiO 2光催化剂表现出优异的可见光活性，发现镧和硼的协同效应是提高光催化活性的原因。
Lanthanum and boron co-doped TiO2(La–B–TiO2) was successfully prepared by modified sol–gel method aiming at enhancing the visible-light photocatalytic performance by improving the quantum efficiency of the photocatalytic reaction and extending the absorption in the visible-light region. The prepared photocatalysts were characterized by different techniques. The results indicated that boron doping could narrow the band gap of titania, and lanthanum doping could suppress the phase transformation and hinder the crystallization of titania. In addition, lanthanum doping could not only increase the adsorption of organic pollutants on the surface of catalyst, but also improve the separation of photogenerated holes and electrons and consequently promote the formation of hydroxyl radicals. The photocatalytic activities of the series samples were evaluated for degradation of Acid Orange 7 (AO7). Compared with the lanthanum doped TiO2and boron doped TiO2samples, the 1%La–B–TiO2photocatalyst exhibited outstanding visible-light activity and it was found that there would be synergistic effects of lanthanum and boron, which was responsible for improving the photocatalytic activity.