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Formation of Cu2O Solid Solution via High-Frequency Electromagnetic Field-Assisted Ball Milling: The Reaction Mechanism

机译：高频电磁场球磨形成Cu2O固溶体的反应机理

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摘要

The contamination of environmental water with organic pollutants poses significant challenges for society, and much effort has been directed toward the development of catalysts and methods that can decompose these pollutants. While effort has been directed toward the fabrication of Cu O catalysts by ball milling, this technique can involve long preparation times and provide low yields. In this study, we synthesized a solid solution of Cu O in 22 h by high-frequency electric-field-assisted ball milling below 40 °C in only one step under aqueous conditions. We investigated the catalytic activities of the produced Cu O solid solution in the microwave-assisted degradation of dyes, namely rhodamine B, phenol red and methyl orange. The prepared Cu O solid solution was very catalytically active and completely degraded the above-mentioned dyes within 2 min. The one-dimensional diffusion model and the phase boundary (planar) model were found to describe the kinetics well. Synergism between ball milling and the high-frequency electromagnetic field plays a key role in the preparation of Cu O solid solution nanoparticles. Ball milling facilitates the relaxation of the Cu O lattice and high-frequency electromagnetic radiation accelerates the diffusion of Fe atoms into the Cu O crystal along the (111) crystal plane, quickly leading to the formation of a Cu O solid solution.
机译：有机污染物对环境水的污染对社会构成了巨大的挑战，并且人们已经致力于开发能够分解这些污染物的催化剂和方法。尽管已经致力于通过球磨制备Cu O催化剂，但是该技术可能需要较长的制备时间并且产率较低。在这项研究中，我们在水性条件下仅通过一步在40°C以下通过高频电场辅助球磨在22 h内合成了Cu O的固溶体。我们研究了生成的Cu O固溶体在若丹明B，酚红和甲基橙染料的微波辅助降解中的催化活性。制备的Cu O固溶体具有很高的催化活性，并在2分钟内完全降解了上述染料。发现一维扩散模型和相边界（平面）模型可以很好地描述动力学。球磨与高频电磁场之间的协同作用在制备Cu O固溶体纳米颗粒中起关键作用。球磨有助于Cu O晶格的弛豫，并且高频电磁辐射会加速Fe原子沿着（111）晶面扩散到Cu O晶体中，从而迅速导致形成Cu O固溶体。

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