Enhancement of photocatalytic activities in hierarchical BiOBr microflowers induced by oxygen vacancies
Enhancement of photocatalytic activities in hierarchical BiOBr microflowers induced by oxygen vacancies
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氧空位诱导分级 BiOBr 微花光催化活性增强
DOI：
10.1016/j.cattod.2018.11.006
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发表时间：
2019
期刊：
影响因子：
5.3
通讯作者：
Qiu Xiaoqing
中科院分区：
文献类型：
--
作者：
Song MingXia;Du Man;Liu Qiuwen;Xing Fangshu;Huang Caijin;Qiu Xiaoqing
双卤氧化合物作为一种有前途的光催化剂受到越来越多的关注。BiOBr表面的氧空位在提高光催化活性方面起着重要作用。在本文中，我们提出了一种简便的方法来制备层次BiOBr的表面氧空位的微孔尿素的存在下，通过溶剂热合成路线。可以通过在合成过程中使用的尿素的量来调节分级BiOBr微花表面上的氧空位的含量。此外，研究发现，具有氧空位的BiOBr微米花比不具有氧空位的BiOBr具有更好的光催化降解罗丹明B的活性.此外，实验结果表明，氧空位可以促进光生电荷的有效分离和传输，有利于BiOBr的光催化性能。这项研究建立了一个深入的了解，有缺陷的氧空位结构的双卤氧化合物为基础的光催化剂。
Bismuth oxyhalides have attracted more and more attention as promising photocatalysts. Oxygen vacancies on the surface of BiOBr play an important role in enhancing photocatalytic activity. In this paper, we present a facile method to prepare hierarchical BiOBr microflowers with surface oxygen vacancies by the solvothermal synthesis route in the presence of urea. The content of oxygen vacancies on the surface of hierarchical BiOBr microflowers can be tuned by the amount of urea used in the synthesis process. Moreover, it was found that hierarchical BiOBr microflowers with oxygen vacancies exhibited much better photocatalytic activity for photocatalytic degradation of Rhodamine B than the BiOBr without oxygen vacancies. Furthermore, experimental results revealed that oxygen vacancies can promote effective separation and transport of photo-generated charges, which is beneficial for photocatalytic performance of BiOBr. This study establishes an in-depth understanding of defective oxygen vacancies structures in Bismuth oxyhalides based photocatalysts.