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摘要: 以Zr (NO3)4·5H2O为锆源, 利用水热法分别制备ZrO2和kaolin/ZrO2复合纳米粉体, 采用扫描电子显微镜、X射线衍射仪、红外光谱仪分析了样品的微观形貌及特性, 使用紫外-可见分光光度计研究了样品的吸光特性, 利用Brunauer-Emmet-Teller (BET)气体吸附法(氮气吸附)测定并计算了样品的比表面积。结果表明, 经过400℃煅烧后, kaolin/ZrO2表面微球颗粒较纯ZrO2更加均匀、单一, 不存在成块团聚体; 两种样品均存在介孔结构, ZrO2主要以无定形形式存在, 但样品中都存在少量的四方相ZrO2; 在波长190~800nm范围内, kaolin/ZrO2纳米粉体吸光率均高于纯ZrO2, 并且其BET比表面积也比纯ZrO2高19.05m2·g-1, kaolin/ZrO2纳米粉体在防紫外光特种材料制备及光催化处理工业废水等方面具有更大的优势与潜力。
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关键词:
- kaolin/ZrO2 /
- 纳米粉体 /
- 制备 /
- 吸附性能
Abstract: The ZrO2 and kaolin/ZrO2 nanopowders were prepared by hydrothermal method, using Zr(NO3)4·5H2O as the zirconium source. The properties and microstructures of the obtained powders were characterized by scanning electron microscope (SEM), X-ray diffraction (XRD), Fourier transform infrared spectrometer (FT-IR), ultraviolet and visible spectrophotometry (UV-Vis), and Brunauer-Emmet-Teller (BET) nitrogen adsorption method. In the results, both ZrO2 and kaolin/ZrO2 samples show the nanoscale microspheres with the mesoporous structure, and the surface microspheres of kaolin/ZrO2 after calcination at 400℃ are more uniform without agglomeration; the ZrO2 mainly exists in amorphous form, but a small number of tetragonal ZrO2 phases are present in these two samples. The absorbance of kaolin/ZrO2 nanopowders is stronger than that of pure ZrO2 in the wavelength ranging from 190 to 800 nm, and the BET specific surface area is 19.05 m2·g-1 higher than that of pure ZrO2. The results indicate that the kaolin/ZrO2 nanopowders have the greater advantages and potential in the preparation of ultraviolet specific materials and photo-catalytic treatment industrial wastewater.-
Key words:
- kaolin/ZrO2 /
- nanopowders /
- preparation /
- adsorption properties
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图 1 Kaolin/ZrO2与纯ZrO2纳米粉体的X射线衍射图(a)与红外光谱图(b)
Figure 1. XRD (a) and FT-IR (b) spectra of the kaolin/ZrO2 and the pure ZrO2 nanopowders
图 2 Kaolin/ZrO2(a)与纯ZrO2(b)纳米粉体的扫描电子显微形貌
Figure 2. SEM images of the kaolin/ZrO2 (a) and the pure ZrO2 (b) nanopowders
图 3 Kaolin/ZrO2与纯ZrO2纳米粉体的紫外–可见吸收光谱
Figure 3. UV-Vis spectra of the kaolin/ZrO2 and the pure ZrO2nanopowders
图 4 Kaolin/ZrO2纳米粉体的BET氮气吸脱附等温线
Figure 4. BET N2 adsorption and desorption isotherms of the kaolin/ZrO2 nanopowders
表 1 Kaolin/ZrO2与纯ZrO2纳米粉体的BET线性拟合数据
Table 1. BET linear fitting of the kaolin/ZrO2 and the pure ZrO2 nanopowders
样品 A B R2 比表面积/(m2·g-1) Kaolin/ZrO2 -0.1940 8.076 0.9999 29.35 纯ZrO2 330.6 7.645 0.9998 10.30 
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