纳米铜在三聚氰胺吸附过程中的稳定性研究

发布时间：2018-01-31 05:45

本文关键词： 纳米铜三聚氰胺吸附光度法稳定性　出处：《武汉理工大学学报》2016年06期 　论文类型：期刊论文

【摘要】：研究了纳米铜在三聚氰胺吸附过程中的稳定性。通过比较两种不同粒径的纳米铜溶胶与三聚氰胺混合溶液的吸收光谱,发现更小粒径的铜纳米团簇的吸收峰值快速下降并至峰位消失,而粒径稍大的铜纳米粒子的吸收峰值下降较慢;在三聚氰胺吸附过程中,两种粒径的纳米铜溶胶的吸收峰位均未发生红移现象,表明纳米铜没有产生团聚。分析认为三聚氰胺在纳米铜表面的吸附部分取代了纳米铜表面原有的还原剂,使铜单质转化为铜离子,溶液中的纳米铜数量减少,发生纳米铜消溶现象,荧光发射减弱。更小粒径的铜纳米团簇具有更大的有效吸附面积,消溶现象显著,稳定性较低。
[Abstract]:The stability of nano-copper in the process of melamine adsorption was studied. The absorption spectra of two kinds of nano-copper sol and melamine mixed solution were compared. It was found that the absorption peak value of the smaller copper nanoclusters decreased rapidly and disappeared to the peak position, while the absorption peak value of the larger copper nanoparticles decreased more slowly. In the process of melamine adsorption, the absorption peak of the two kinds of nano-copper sol did not appear red shift phenomenon. It is considered that the adsorption of melamine on the surface of nano-copper replaces the original reducing agent on the surface of nano-copper, which makes the copper into copper ion, and the amount of nano-copper in the solution is reduced. The phenomenon of nano-copper dissolving occurs, the fluorescence emission is weakened, the smaller copper nanoclusters have larger effective adsorption area, the dissolving phenomenon is obvious, and the stability is low.
【作者单位】：武汉理工大学化学化工与生命科学学院;湖北省水果湖高级中学;
【基金】：湖北省自然科学基金(2014CFB258)
【分类号】：TB383.1;O614.121
【正文快照】： 纳米团簇是由数个到数百个原子或分子聚集在一起形成的纳米尺度的超微粒子。它与块体材料、原子相比具有完全不同的物理和化学性能,且性能随尺寸差异而显著变化。纳米团簇作为新功能材料在各个领域受到广泛关注,其中贵金属纳米粒子因其在光学、催化、微电子、生物医学等领域有

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