Monodispersed Ag nanoparticles loaded on the surface of spherical Bi2WO6 nanoarchitectures with enhanced photocatalytic activities
Monodispersed Ag nanoparticles loaded on the surface of spherical Bi2WO6 nanoarchitectures with enhanced photocatalytic activities
复制标题
负载在球形 Bi2WO6 纳米结构表面上的单分散 Ag 纳米粒子具有增强的光催化活性
DOI：
10.1039/c2jm14448d
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发表时间：
2012-01-01
影响因子：
--
通讯作者：
Li, Dongsheng
中科院分区：
文献类型：
--
作者：
Wang, Danjun;Xue, Ganglin;Li, Dongsheng
以硝酸铋和钨酸铵为原料，通过水热反应制备了尺寸为2-4 μ m的球形Bi 2 WO 6纳米结构。通过光还原法在Bi_2WO_6表面沉积Ag。采用UV-Vis-DRS、BET、XRD、XPS、FE-SEM、HR-TEM等手段对样品进行了表征。结果表明，在球形Bi 2 WO 6纳米结构表面沉积了平均粒径为10-15 nm的单分散金属Ag纳米颗粒。以罗丹明B（RhB）和噻吩为目标物，在可见光照射下考察了样品的光催化活性。结果表明，Ag的负载大大提高了Bi 2 WO 6的光催化活性，且负载银的含量对Bi 2 WO 6的催化活性有影响。结果表明，载银量为0.5at%的Bi 2 WO 6光催化剂对罗丹明B的脱色和噻吩的脱硫均表现出最佳的光催化活性。此外，通过比较它们的荧光光谱，探讨了载银Bi 2 WO 6光催化活性增强的机理。
Spherical Bi2WO6 nanoarchitectures with scale of 2-4 mu m were prepared by a hydrothermal reaction using bismuth nitrate and ammonium tungstate as raw materials. Ag was deposited on the surface of Bi2WO6 via a following facile photoreduction process. The as-prepared samples were characterized by UV-Vis-DRS, BET, XRD, XPS, FE-SEM, and HR-TEM. The results revealed that the monodispersed metallic Ag nanoparticles with average size of 10-15 nm were deposited on the surface of the spherical Bi2WO6 nanoarchitectures. The photocatalytic activities of the samples were evaluated by the photodegradation of RhB and thiophene under visible light irradiation. The results showed that Ag loading greatly improved the photocatalytic activity of Bi2WO6, and the content of loading silver has an impact on the catalytic activity of Bi2WO6. The 0.5at%Ag-loaded Bi2WO6 sample exhibited the best photocatalytic activity in both the decolorization of RhB and desulfurization of thiophene. In addition, the mechanism for the enhancement of the photocatalytic activity of Ag-loaded Bi2WO6 was also investigated by comparison of their PL spectra.