| 题名 | 表面包覆氧化铝的纳米氧化锌研究 |
| 作者 | 尹春雷 |
| 学位类别 | 硕士 |
| 答辩日期 | 2003 |
| 授予单位 | 中国科学院过程工程研究所 |
| 授予地点 | 中国科学院过程工程研究所 |
| 导师 | 袁方利 |
| 关键词 | 纳米氧化锌 表面包覆 氧化铝 复合粉体 光催化活性 |
| 其他题名 | Study on Al_2O_3-coated Nano-ZnO Composite Powder |
| 学位专业 | 化学工艺 |
| 中文摘要 | 过量紫外线辐射对人体有很大的危害,纳米氧化锌具有优异的紫外线屏蔽性能,但是其很高的化学催化和光催化活性影响了其在防紫外线领域的应用.在降低纳米氧化锌的化学催化和光催化活性的同时,保留其优异的紫外线屏蔽性能是纳米氧化锌在防紫外线领域应用需要解决的重要问题.为了解决这一问题,该文在制备氧化锌的前驱物——碱式碳酸锌的过程中原位包覆氧化铝.与多数文献采用的包覆方法相比,省去了多个实验步骤、避免了这些步骤中粒子的团聚,进而改善了包覆效果,获得单分散的纳米氧化锌颗粒. |
| 英文摘要 | Excessive exposure to ultraviolet radiation may result in harmful health effects on the skin, eye and immune system. Nano-ZnO has excellent ultraviolet screen property, but its photocatalysis and catalytic activity cumber its application in shield ultraviolet field. Reducing the photocatalysis and catalytic activity as well keeping the excellent ultraviolet screen property is the issue of nano-ZnO application in shield ultraviolet field. In this thesis, Al2O3-coated nano-ZnO composite powder was obtained by coating in the slurry of basic zinc carbonate, the precursor of nano-ZnO. The coating method is heterogeneous nucleation. Comparing with coating on the calcined ZnO surface, the typical coating method, less steps are required in this coating process and the agglomeration in those steps is avoided, and the effect of coating is much better. The composite powder was examined by TEM, XPS and ultraviolet-visible spectrophotometry. Its photocatalysis and catalytic activity were determined by oxidation of castor oil. The TEM micrographs of the composite powder indicate that the average diameter of the particles is about 50 nm, and the thickness of the homogeneous film is 3-5 mil. The XPS of the composite powder approve that the homogeneous film is composed of AI2O3 and ZnO. The composite powder has nice ultraviolet-adsorption and its photocatalysis and catalytic activity reduce sharply. The optimum coating time is 40 min, the optimum coating temperature is 60°C, and the optimum coating quantity is 5%. The process of heterogeneous nucleation was analyzed and the mechanism of decrease of photocatalysis activity was discussed. |
| 语种 | 中文 |
| 公开日期 | 2013-09-16 |
| 页码 | 60 |
| 内容类型 | 学位论文 |
| 源URL | [http://ir.ipe.ac.cn/handle/122111/1363]  |
| 专题 | 过程工程研究所_研究所（批量导入） |
| 推荐引用方式 GB/T 7714 | 尹春雷. 表面包覆氧化铝的纳米氧化锌研究[D]. 中国科学院过程工程研究所. 中国科学院过程工程研究所. 2003. |
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