Synthesis of visible-light sensitive M-BiVO4 (M = Ag, Co, and Ni) for the photocatalytic degradation of organic pollutants

Synthesis of visible-light sensitive M-BiVO4 (M = Ag, Co, and Ni) for the photocatalytic degradation of organic pollutants
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合成可见光敏感的 M-BiVO4(M = Ag、Co 和 Ni)用于光催化降解有机污染物

DOI:
10.1016/j.seppur.2010.12.017
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发表时间:
2011-03
影响因子:
8.6
通讯作者:
Huang, C. P.
Huang, C. P.
中科院分区:
工程技术1区
文献类型:
--
作者:
Zhou, Bin;Zhao, Xu;Liu, Huijuan;Qu, Jiuhui;Huang, C. P.

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利用非晶异核配合物前驱体成功制备了一系列M–BiVO4(M=Ag、Co和Ni)颗粒。使用X射线衍射分析(XRD)、X射线光电子能谱(XPS)、扫描电子显微镜(SEM)、紫外可见漫反射光谱和拉曼光谱对颗粒进行表征。结果表明,结晶的M-BiVO4具有单斜相,杂化金属Co和Ni主要以氧化物的形式附着在BiVO4颗粒上。 M-BiVO4 光催化剂对可见光有响应。在波长 >420nm 下观察到甲基蓝和 2,4-二氯苯酚在 M-BiVO4 复合材料上的光降解。 Co-BiVO4表现出最好的光催化效率,照射2小时(λ>420nm)后脱色率约为85%。 5小时内去除了近90%的2,4-二氯苯酚。电子顺磁共振(EPR)研究证实,在光照射下形成超氧化物和氢氧自由基,可能是有机化合物降解的原因。
A series of M–BiVO4(M=Ag, Co, and Ni) particles were successfully prepared by amorphous heteronuclear complex precursor. The particles were characterized using X-ray diffraction analysis (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscope (SEM), UV–vis diffuse reflectance spectroscopy and Raman spectra. The results showed that the crystallized M–BiVO4had a monoclinic phase with the hybrid metals, namely Co and Ni being attached on BiVO4particles in the form of oxides mainly. The M–BiVO4photocatalysts were responsive to visible light. Photodegradation of both methyl blue and 2,4-dichlorophenol over M–BiVO4composites was observed at wavelength >420nm. Co–BiVO4exhibited the best photocatalytic efficiency, with a decoloration percent of about 85% after 2-h irradiation (at λ>420nm). Nearly 90% of 2,4-dichlorophenol was removed in 5h. Electron paramagnetic resonance (EPR) study confirmed that superoxide and hydroxide radicals were formed under light irradiation and might be responsible for the degradation of the organic compound.
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