Xu Yang-Sen, Yu Yu-Xiang, Zhang Wei-De
J Nanosci Nanotechnol. 2014 Sep;14(9):6800-8. doi: 10.1166/jnn.2014.8974.
Hierarchical Bi2O2CO3/Bi2MoO6 heterostructured photocatalysts composed of nanoplatelets of Bi2O2CO3 and Bi2MoO6 were successfully prepared by a facile template-free solvothermal process. The microsphere-like Bi2O2CO3/Bi2MoO6 composites exhibited superior visible light photocatalytic activity towards degradation of rhodamine B. The highest degradation efficiency was observed on the material with the Bi/Mo molar ratio of 2.88/1, which can degrade 99% rhodamine B within 90 min, while only 44% rhodamine B was degraded over the pure Bi2MoO6 microspheres and 2% over the Bi2O2CO3 nanoplatelets. The dramatic enhancement in their photocatalytic performance of the Bi2O2CO3/Bi2MoO6 photocatalysts can be attributed to the high surface area and the effective separation of the photoinduced carriers at the interfaces and in the semiconductors. The photo-generated h+(VB) in the Bi2O2CO3/Bi2MoO6 photocatalysts turn out to be the dominant active species in the photocatalytic reaction. Importantly, Bi2O2CO3/Bi2MoO6 displayed visible-light photocatalytic activity for the destruction of E. coli (the percent kill is 99.09 in 60 min). In addition, the Bi2O2CO3/Bi2MoO6 composite was very stable during the reaction and can be used repeatedly. These features mean the present heterostructured photocatalyst can be applied in environmental remediation, and waste water disinfection.
通过简便的无模板溶剂热法成功制备了由Bi2O2CO3和Bi2MoO6纳米片组成的分级Bi2O2CO3/Bi2MoO6异质结构光催化剂。微球状的Bi2O2CO3/Bi2MoO6复合材料对罗丹明B的降解表现出优异的可见光光催化活性。在Bi/Mo摩尔比为2.88/1的材料上观察到最高的降解效率，该材料可在90分钟内降解99%的罗丹明B，而纯Bi2MoO6微球上仅降解44%的罗丹明B，Bi2O2CO3纳米片上仅降解2%。Bi2O2CO3/Bi2MoO6光催化剂光催化性能的显著增强可归因于高表面积以及光生载流子在界面处和半导体中的有效分离。Bi2O2CO3/Bi2MoO6光催化剂中的光生h+(VB)是光催化反应中的主要活性物种。重要的是，Bi2O2CO3/Bi2MoO6对大肠杆菌的破坏表现出可见光光催化活性（60分钟内杀灭率为99.09%）。此外，Bi2O2CO3/Bi2MoO6复合材料在反应过程中非常稳定，可以重复使用。这些特性意味着目前的异质结构光催化剂可应用于环境修复和废水消毒。
