Controlled growth of single-crystalline Bi.333(Bi6S9)Br nanorods under hydrothermal conditions for enhanced photocatalytic reduction of Cr (VI)
Controlled growth of single-crystalline Bi.333(Bi6S9)Br nanorods under hydrothermal conditions for enhanced photocatalytic reduction of Cr (VI)
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水热条件下单晶 Bi.333(Bi6S9)Br 纳米棒的受控生长增强 Cr (VI) 的光催化还原
DOI：
10.1016/j.jallcom.2020.155879
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发表时间：
2020-11
影响因子：
6.2
通讯作者：
贾丽霞
中科院分区：
文献类型：
--
作者：
艾礼莉;贾殿赠;郭楠楠;徐梦姣;张苏;王鲁香;贾丽霞
光催化材料的组成和结构的合理设计对于光催化技术的实际应用尤为关键。本文首次采用一锅水热法合成了均匀的单晶Bi. 333（Bi 6S 9）Br纳米棒。通过延长水热反应时间，观察了Bi. 333（Bi 6S 9）Br从纳米颗粒到短纳米棒，再到长纳米棒的演化过程。Bi. 333（Bi 6S 9）Br纳米棒由于表面缺陷的存在和独特的结构，可以有效抑制光生电子-空穴对的复合，有效吸附Cr（VI），从而提高光催化活性。Bi. 333（Bi 6S 9）Br纳米棒在可见光下将Cr（VI）水溶液快速还原为Cr（III），表现出优异的光催化性能和良好的可回收性。Cr（VI）的降解率在60 min内达到90.96%，经过6次光催化循环后，Bi. 333（Bi 6S 9）Br的结构没有发生变化。基于Bi. 333（Bi 6S 9）Br的能带结构和电子自旋共振自由基清除实验，提出了纳米棒的光催化反应机理。
The rational design of composition and structure of the photocatalytic materials is especially critical for the practical application of photocatalytic technology. Herein, uniform single-crystal Bi.333(Bi6S9)Br nanorods were synthesized for the first time using a one-pot hydrothermal method. By prolonging the hydrothermal reaction time, the evolution process of Bi.333(Bi6S9)Br from nanoparticles to short nanorods, and finally to long nanorods was observed. Bi.333(Bi6S9)Br nanorods can effectively inhibit the recombination of photogenerated electron-hole pairs and effectively adsorb of Cr (VI) due to the presence of surface defects and unique structure, thereby promoting the photocatalytic activity. Bi.333(Bi6S9)Br nanorods exhibited excellent photocatalytic performance as well as promising recyclability in rapidly reducing aqueous Cr (VI) to Cr (III) under visible light. The degradation rate of Cr (VI) reached 90.96% within 60 min, and the structure of Bi.333(Bi6S9)Br did not change after six photocatalytic cycles. The photocatalytic reaction mechanism of nanorods was proposed based on the band structure of Bi.333(Bi6S9)Br and electron spin resonance radical scavenging assay.
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