Pristine Bi2WO6 and hybrid Au-Bi2WO6 hollow microspheres with excellent photocatalytic activities
Pristine Bi2WO6 and hybrid Au-Bi2WO6 hollow microspheres with excellent photocatalytic activities
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具有优异光催化活性的原始 Bi2WO6 和杂化 Au-Bi2WO6 空心微球
DOI：
10.1016/j.apsusc.2018.07.024
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发表时间：
2018-11-01
影响因子：
6.7
通讯作者：
Shen, Xiaoshuang
中科院分区：
文献类型：
--
作者：
Zhou, Yuxue;Lv, Pengfei;Shen, Xiaoshuang
以十六烷基三甲基溴化铵(CTAB)为晶体生长导向剂，首次在乙二醇水体系中制备了纯净的Bi2WO6中空微球，并通过对Au纳米粒子的原位修饰得到了杂化Au-Bi2WO6中空微球，并对其形成机理进行了探讨。研究了它们在可见光照射下对水溶液中铬(VI)的光催化还原和苯酚的光降解活性。杂化Au-Bi2WO6中空微球表现出最高的光催化活性，仅在20min内就将六价铬几乎完全还原为三价铬。非均相Au-Bi2WO6中空微球优异的光催化活性可以归因于其捕光效率的提高(由于中空结构的光多重散射效应)、电子捕获效应和表面等离子体共振(SPR)效应导致的光生电子-空穴对的高度分离。
Pristine Bi2WO6 hollow microspheres have been fabricated in ethylene glycol-water system with CTAB as crystal growth director for the first time, hybrid Au- Bi2WO6 hollow microspheres was also obtained by in situ decoration of Au nanoparticles, the formation mechanisms were explored. Their photocatalytic activities on photoreduction of Cr(VI) and photo-degradation of phenol in aqueous solution were investigated under visible light irradiation. Hybrid Au- Bi2WO6 hollow microspheres displayed the highest photocatalytic activity, exhibiting a nearly complete reduction of Cr(VI) to Cr(III) within only 20 min. The excellent photocatalytic activities of heterogeneous Au-Bi2WO6 hollow microspheres can be induced by the increased light harvesting efficiency (due to light multi-scattering effect of hollow architecture), high separation of photogenerated electron-hole pairs caused by electron trapping effect and surface plasmon resonance (SPR) effect of Au nanoparticles.