Fabrication of flower-like Ag@AgCl/Bi2WO6 photocatalyst and its mechanism of photocatalytic degradation
Fabrication of flower-like Ag@AgCl/Bi2WO6 photocatalyst and its mechanism of photocatalytic degradation
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DOI：
10.1016/j.colsurfa.2015.11.009
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发表时间：
2016-01
期刊：
影响因子：
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通讯作者：
Jinglin Zhu;Shaomin Liu;Qing Yang;Pengpeng Xu;J. Ge;Xuetao Guo
中科院分区：
文献类型：
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作者：
Jinglin Zhu;Shaomin Liu;Qing Yang;Pengpeng Xu;J. Ge;Xuetao Guo
采用水热法和原位氧化法合成了三元花状光催化剂（Ag@AgCl/Bi 2 WO 6）。采用扫描电子显微镜（SEM）、X射线衍射、傅里叶变换红外光谱、漫反射紫外-可见光谱、Brunauer-Emmett-Teller和X射线光电子能谱对催化剂进行了表征。SEM照片显示花状Bi 2 WO 6的表面上有立方体状的Ag@AgCl沉积物。在光催化实验中，AB-0.2对双酚A的降解率分别是Bi 2 WO 6和Ag@AgCl的1.81和1.33倍。在可见光下，Ag@AgCl/Bi 2 WO 6催化剂在120 min内对双酚A的降解率接近100%。这种优异的催化能力主要归因于Ag纳米颗粒的形成和催化剂表面上的电子-空穴对的高分离效率。对主要活性物种的研究表明，自由基dotO 2 −和h+在双酚A的光催化降解中起着重要作用。此外，还提出了Ag@AgCl/Bi 2 WO 6复合材料可能的等离子体Z-机制。
A ternary flower-like photocatalyst (Ag@AgCl/Bi2WO6) was successfully synthesized by hydrothermal treatment and in situ oxidation reaction. The as-prepared catalysts were characterized using scanning electron microscopy (SEM), X-ray diffraction, Fourier transform infrared spectroscopy, diffuse reflectance UV–vis spectroscopy, Brunauer–Emmett–Teller, and X-ray photoelectron spectroscopy. SEM images show cube-like Ag@AgCl deposits on the surface of the flower-like Bi2WO6. In the photocatalytic experiment, results show that the degradation ratios of bisphenol A with AB-0.2 were 1.81 and 1.33 times higher than those of Bi2WO6and Ag@AgCl, respectively. The degradation ratio of bisphenol A with Ag@AgCl/Bi2WO6was nearly 100% within 120 min under visible light. This excellent catalytic ability is mainly attributed to Ag nanoparticle formation and high separation efficiency of the electron-hole pairs on the catalyst surface. Investigation of the main reactive species indicates that radical dotO2−and h+play an important role in the photocatalytic degradation of bisphenol A. In addition, a possible plasmonic Z-scheme mechanism of Ag@AgCl/Bi2WO6composite was proposed.