Visible-light photocatalytic activity of SiC hollow spheres prepared by a vapor–solid reaction of carbon spheres and silicon monoxide
Visible-light photocatalytic activity of SiC hollow spheres prepared by a vapor–solid reaction of carbon spheres and silicon monoxide
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DOI：
10.1016/j.ceramint.2013.10.068
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发表时间：
2014-03
影响因子：
5.2
通讯作者：
Ouyang Haibo;H. Jianfeng;Zeng Xie-rong;Cao Li-yun;Li Cuiyan;Xiong Xin-bo;Fei Jie
中科院分区：
文献类型：
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作者：
Ouyang Haibo;H. Jianfeng;Zeng Xie-rong;Cao Li-yun;Li Cuiyan;Xiong Xin-bo;Fei Jie
以碳球为模板，采用气固反应法制备了碳化硅空心球。用x射线衍射、扫描电镜、氮吸附和紫外-可见漫反射光谱对制备的碳化硅空心球进行了表征。通过光催化分解水溶液中的亚甲基蓝，评价了亚甲基蓝的可见光催化活性。结果表明，SiC空心球直径在200 ~ 300 nm之间，壳厚约50 nm。碳化硅空心球具有83.5 m2/g的高表面积和介孔结构特征。SiC空心球的光响应扩展到可见光区，带隙能量为2.15 eV。碳化硅空心球由于其高表面积和光捕获效率而表现出显著增强的光催化活性。
SiC hollow spheres are obtained by a vapor–solid reaction using carbon spheres as templates. The prepared SiC hollow spheres are characterized by X-ray diffraction, scanning electron microscopy, nitrogen adsorption, and UV–vis diffuse reflectance spectra. The visible-light photocatalytic activity is evaluated by photocatalytic decomposition of the methylene blue in aqueous solution. Results show that the diameter of SiC hollow spheres ranges from 200 to 300 nm and the shell thickness is about 50 nm. The SiC hollow spheres have a high surface area of 83.5 m2/g and exhibit a mesoporous structure characteristic. The photo-response of the SiC hollow spheres expand to visible-light region with band gap energy of 2.15 eV. The SiC hollow spheres exhibit a significantly enhanced photocatalytic activity due to their high surface area as well as large light-harvesting efficiencies.