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球形TiO2-ZnO复合纳米颗粒的合成、表征及光催化性能(英文)

发布时间:2019-01-12 18:13  文章来源:笔耕文化传播
【摘要】:通过简单、快速的两步法成功制得了一系列不同摩尔比的球形TiO_2-ZnO复合纳米颗粒。用X射线衍射仪(XRD)、场发射扫描电子显微镜(FESEM)及紫外-可见漫反射光谱(UV-vis DRS)等多种手段对产物进行表征。研究发现,TiO_2-ZnO复合物中TiO_2和ZnO两相独立存在;颗粒粒径并非随TiO_2与ZnO摩尔比的提高单调减小,而是先减小后增大;与纯ZnO相比,TiO_2-ZnO复合物的吸收边带发生了明显红移。以甲基橙(MO)和亚甲基蓝(MB)为降解对象,考察了紫外-可见光照下所制TiO_2-ZnO复合纳米颗粒的光催化效果。实验结果显示,所有TiO_2-ZnO复合纳米颗粒均具有较纯ZnO更高的光催化活性。TiO_2与ZnO的摩尔比为0.75∶1时,复合物光催化降解甲基橙的效果最好,TiO_2与ZnO的摩尔比为1∶1时,复合物光催化降解亚甲基蓝的效果最好。
[Abstract]:A series of spherical TiO_2-ZnO composite nanoparticles with different molar ratios were successfully prepared by a simple and fast two-step method. The products were characterized by X-ray diffractometer (XRD), field emission scanning electron microscope (FESEM) and UV-Vis diffuse reflectance spectroscopy (UV-vis DRS). It is found that the TiO_2 and ZnO phases exist independently in the TiO_2-ZnO complex, and the particle size decreases firstly and then increases with the increase of the molar ratio of TiO_2 to ZnO. Compared with pure ZnO, the absorption sideband of TiO_2-ZnO complex has a red shift. Using methyl orange (MO) and methylene blue (MB) as degradation objects, the photocatalytic effect of TiO_2-ZnO composite nanoparticles prepared by UV-Vis irradiation was investigated. The experimental results show that all TiO_2-ZnO composite nanoparticles have higher photocatalytic activity than pure ZnO. When the molar ratio of TiO_2 to ZnO is 0.75: 1, the photocatalytic degradation of methyl orange is the best. When the molar ratio of TiO_2 to ZnO is 1:1, the photocatalytic degradation of methylene blue is the best.
【作者单位】: 河北工程大学数理科学与工程学院;
【基金】:National Natural Science Foundation of China(51541403) Natural Science Foundation of Hebei Province(B2014402062)
【分类号】:TB383.1;O643.36


本文编号:2408055


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