Facile microwave synthesis of novel hierarchical Bi24O31Br10 nanoflakes with excellent visible light photocatalytic performance for the degradation of tetracycline hydrochloride
Facile microwave synthesis of novel hierarchical Bi24O31Br10 nanoflakes with excellent visible light photocatalytic performance for the degradation of tetracycline hydrochloride
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DOI：
10.1016/j.cej.2013.03.103
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发表时间：
2013-06
影响因子：
15.1
通讯作者：
Xin Xiao;Ruiping Hu;Chaoqiao Liu;Chun‐Yong Xing;Xiaoxi Zuo;J. Nan;Lishi Wang
中科院分区：
文献类型：
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作者：
Xin Xiao;Ruiping Hu;Chaoqiao Liu;Chun‐Yong Xing;Xiaoxi Zuo;J. Nan;Lishi Wang
采用一种简单、节能的微波加热方法快速合成了Bi 24 O31 Br 10纳米片。系统研究了其可见光催化降解含四环素废水的性能。结果表明，Bi 24 O31 Br 10是由BiOBr与OH−在pH值为9.5 ~ 11.5范围内反应生成的，其分级结构的形成机理可以用微波加热下的溶解-重结晶过程来解释。合成的Bi 24 O31 Br 10纳米片表现出更强的可见光吸收（带隙能量2.51eV）、更高的BET表面积（40.1m2g−1）和带负电的表面，这导致在相同的可见光照射下，比三维（3D）BiOBr微球具有更高的光催化降解TC的活性。此外，Bi 24 O31 Br 10纳米片在反应过程中相对稳定，可重复使用，在四环素类药物的处理方面具有良好的工业应用前景。
A simple, one-step, and energy-saving microwave heating route for rapid synthesis of hierarchical Bi24O31Br10nanoflakes has been demonstrated. And its visible-light photocatalytic performance for the degradation of tetracycline hydrochloride (TC, a commonly used antibiotic) containing in wastewater is investigated systematically. The results reveal that the Bi24O31Br10is obtained by the reaction of BiOBr with OH−over the pH range from 9.5 to 11.5, and the formation mechanism of such hierarchical structure can be explained by a dissolution–recrystallization process under microwave heating. The as-synthesized Bi24O31Br10nanoflakes exhibit a stronger visible light absorption (band gap energy 2.51eV), higher BET surface area (40.1m2g−1), and negatively charged surface, which results in the enhanced photocatalytic activity for the degradation of TC than three-dimensional (3D) BiOBr microspheres under identical visible light irradiation. In addition, the Bi24O31Br10nanoflakes are relatively stable during the reaction and can be used repeatedly, showing promising prospect for the treatment of tetracyclines in future industrial application.