论文溶胶—凝胶法尺寸选择性合成ZnO纳米颗粒其光催化性能是关于对不知道怎么写光催化论文范文课题研究的大学硕士、相关本科毕业论文光催化反应器论文开题报告范文和文献综述及职称论文的作为参考文献资料下载。
摘 要在溶胶凝胶合成过程中,分别利用超声波处理ZnO溶胶、加水至溶胶中煮沸、加庚烷至溶胶中、蒸发除去部分溶剂等简单的沉淀方法制备了10 nm以下不同尺寸的ZnO颗粒.在60 ℃下通过超声波处理ZnO溶胶可得到高质量的ZnO纳米颗粒,颗粒粒径为6.2±1.5 nm,标准偏差为8%.同时,基于作者以前的发现,提出了在该溶胶凝胶法中新的ZnO形成机理.在光催化降解 橙过程中,纳米ZnO不同的颗粒尺寸及团聚情况导致其光催化活性有所差异,具有较小粒径和团聚较轻的ZnO纳米颗粒显示出较高的光催化活性.
关键词ZnO纳米颗粒；沉淀；溶胶凝胶法；颗粒尺寸；分散性；光催化
The properties of ZnO nanocrystals are highly dependent on their sizes and agglomeration situations. The synthesis of ZnO nanocrystals with controllable sizes and less agglomerations is still one of the most challenging and urgent topics.
It is well known that a facile precipitation method is an operative way to synthesize ZnO nanocrystals with different sizes. Hoyer et al[11] precipitated ZnO nanoparticles through the addition of water to the boiling colloidal ZnO solution. Meulenkamp[2] achieved this by using alkanes, e.g., heptane, to precipitate ZnO nanoparticles. In our previous paper[12], we found that sonicating the colloidal ZnO solution could also precipitate ZnO nanoparticles without using any solvents. Inevitably, these different methods for the precipitations of ZnO nanoparticles have effects on the sizes, polydispersities and agglomerations of ZnO nanoparticles.
Herein, we prepared ZnO nanoparticles with different sizes by diverse facile precipitation methods during a solgel synthesis procedure and investigated the influences of these precipitation methods on the sizes, polydispersities and agglomerations of ZnO nanoparticles. Meanwhile, their photocatalytic properties were also studied and a new mechanism for the formation of ZnO nanocrystals via the solgel route was proposed based on our previous findings.
1Experimental
1.1Syntheses of colloidal ZnO solution
The synthesis of colloidal ZnO solution was similar to the methods described by Meulenkamp[2] and in our previous paper[13]. A 2.86 g （13 mmol） amount of Zn（Ac）2·2H2O was placed in 130 mL of absolute ethanol, and then the mixture was heated to dissolve Zn（Ac）2·2H2O under magnetic stirring. When Zn（Ac）2·2H2O was dissolved completely, the Zn2+containing solution obtained was diluted to 130 mL by the addition of absolute ethanol and cooled to 0 ℃. 0.754 g of LiOH·H2O （18 mmol） was dissolved in 130 mL of absolute ethanol at room temperature under magnetic stirring. The hydroxidecontaining solution was then added dropwise into the Zn2+containing solution at 0 ℃ under stirring. The sol obtained was the mixture of ZnO colloid and an intermediate of hydroxy double salt Zn5（OH）8（Ac）2·2H2O （ZnHDS）. The hydroxy double salt could easily transform into ZnO phase through sonicating or heating[13].
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参考文献：
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5、 郭庆辀和他水凝胶世界 “……如果我能够做到的话，我有权成为一位不寻常的人。我寻找机会，但我不寻求安稳。我不希望在国家的照顾下成为一名有保障的国民，那将被人瞧不起而使我。