Annealing effects on the photocatalytic activity of ZnO nanoparticles.
Annealing effects on the photocatalytic activity of ZnO nanoparticles.
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DOI：
10.1166/jnn.2011.3801
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发表时间：
2011-04
影响因子：
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通讯作者：
T. Giraldi;G. V. F. Santos;V. R. Mendonça;C. Ribeiro;I. T. Weber
中科院分区：
文献类型：
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作者：
T. Giraldi;G. V. F. Santos;V. R. Mendonça;C. Ribeiro;I. T. Weber
采用化学方法制备纳米ZnO，以罗丹明B（RhB）为探针反应，测试其在染料废水中的降解性能。对样品进行不同的热处理，以观察退火对光催化性能、表面去污和随后的颗粒变化（结晶度）的影响。所制备的样品（ZOA）对应于亚稳相（氧或羟基乙酸锌）和后退火导致ZnO结晶。尽管XRD图显示在100 ℃下热处理时只有ZnO相，但FTIR数据显示羧酸根基团在高达300 ℃时仍附着在ZnO表面上。高达300摄氏度的存在下，这些羧酸基团，提供了合成方法，显示出更相关的光活性比表面积。在较高温度下，结晶度成为主导因素，并且结晶度的增加有利于光活性。
This paper describes the development of ZnO nanoparticles by a chemical method, to test them in the photocatalysis of the degradation of textile dyes, using Rhodamine B (RhB) as a probe reaction. The samples were submitted to different heat treatments in order to observe the annealing effects on the photocatalytical properties, surface decontamination and the consequent particle change, in terms of crystallinity. The as-prepared samples (ZOA) correspond to a metastable phase (oxy or hydroxy zinc acetate) and post annealing leads to ZnO crystallization. In spite of the XRD patterns showing only the ZnO phase for heat treatment at 100 degrees C, FTIR data show that carboxylate groups remains attached to the ZnO surface up to 300 degrees C. Up to 300 degrees C the presence of these carboxylate groups, provided by the synthesis method, showed to be more relevant to photoactivity than the specific surface area. At higher temperatures, crystallinity becomes the dominant factor and an increasing of crystallinity favors the photoactivity.