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

机译：通过高频电磁场辅助球铣削形成Cu2O固溶体：反应机理

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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 Cu2O catalysts by ball milling, this technique can involve long preparation times and provide low yields. In this study, we synthesized a solid solution of Cu2O 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 Cu2O solid solution in the microwave-assisted degradation of dyes, namely rhodamine B, phenol red and methyl orange. The prepared Cu2O 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 Cu2O solid solution nanoparticles. Ball milling facilitates the relaxation of the Cu2O lattice and high-frequency electromagnetic radiation accelerates the diffusion of Fe atoms into the Cu2O crystal along the (111) crystal plane, quickly leading to the formation of a Cu2O solid solution.
机译：环境水与有机污染物的污染对社会产生了重大挑战，并且有很多努力旨在开发可以分解这些污染物的催化剂和方法。虽然努力通过球磨用于制造Cu2O催化剂，但该技术可涉及长度的制备时间并提供低产率。在该研究中，在水性条件下仅在40°C下，通过低于40℃的高频电场辅助球铣削，在22小时内合成了Cu 2 O的固溶体。我们研究了在微波辅助降解染料中产生的Cu2O固溶体的催化活性，即Rhodamine B，酚红色和甲基橙。制备的Cu 2 O固体溶液非常催化活性，并在2分钟内完全降解上述染料。发现一维扩散模型和相位边界（平面）模型描述了动力学。球磨和高频电磁场之间的协同作用在制备Cu2O固溶体纳米粒子的制备中起关键作用。球磨促进了Cu2O格子的松弛，高频电磁辐射加速了Fe原子的扩散沿（111）晶体平面进入Cu2O晶体中，快速导致形成Cu2O固体溶液。

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