Facile preparation of heterostructured Bi2O3/Bi2MoO6 hollow microspheres with enhanced visible-light-driven photocatalytic and antimicrobial activity
Facile preparation of heterostructured Bi2O3/Bi2MoO6 hollow microspheres with enhanced visible-light-driven photocatalytic and antimicrobial activity
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DOI：
10.1016/j.materresbull.2012.12.063
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发表时间：
2013-04-01
影响因子：
5.4
通讯作者：
Zhang, Wei-De
中科院分区：
文献类型：
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作者：
Xu, Yang-Sen;Zhang, Ze-Jun;Zhang, Wei-De
采用无模板溶剂热法一步合成了不同β-Bi 2 O3负载量（0 ~ 26.5mol%）的纳米片组装的分级结构β-Bi 2 O3/Bi 2 MoO 6异质花状微球。在可见光照射下（λ> 420 nm），在21.9 mol%的β-Bi 2 O3负载Bi 2 O3/Bi 2 MoO 6微球上，罗丹明B在90 min内降解率超过99%.分级Bi 2 O3/Bi 2 MoO 6微/纳米结构的光催化活性的显著增强可以归因于界面处和半导体中的光生载流子的有效分离。电子（e（-））是可见光照射下水溶液中的主要活性物种。Bi_2O_3/Bi_2MoO_6还表现出可见光光催化降解大肠杆菌的活性。杆菌此外，分级Bi 2 O3/Bi 2 MoO 6微球中的β-Bi 2 O3非常稳定，通过简单的过滤步骤，复合物可以容易地回收利用，从而可以有效地避免二次污染。根据实验结果提出了可能的光催化机理。(C)2012爱思唯尔有限公司版权所有。
Hierarchical beta-Bi2O3/Bi2MoO6 heterostructured flower-like microspheres assembled from nanoplates with different beta-Bi2O3 loadings (0-26.5 mol%) were synthesized through a one-step template-free solvothermal route. Under visible-light illumination (lambda > 420 nm), over 99% of rhodamine B was degraded within 90 min on the 21.9 mol% of beta-Bi2O3 loading Bi2O3/Bi2MoO6 microspheres. The remarkable enhancement of photocatalytic activity, of the hierarchical Bi2O3/Bi2MoO6 micro/nanostructures can be attributed to the effective separation of the photoinduced charge carriers at the interfaces and in the semiconductors. The electrons (e(-)) are the main active species in aqueous solution under visible-light irradiation. The Bi2O3/Bi2MoO6 also displays visible-light photocatalytic activity for the destruction of E. coli. In addition, the beta-Bi2O3 in the hierarchical Bi2O3/Bi2MoO6 microspheres is very stable and the composite can be easily recycled by a simple filtration step, thus the second pollution can be effectively avoided. A possible photocatalytic mechanism was proposed based on the experimental results. (C) 2012 Elsevier Ltd. All rights reserved.