Zhang Yingzhe, Chen Yudao, Li Juan, Li Wei, Chen Ding, Qin Qingdong
College of Materials and Metallurgical Engineering, Guizhou Institute of Technology, Guiyang 550003, China.
School of Energy and Power Engineering, Changsha University of Science & Technology, Changsha 410014, China.
Materials (Basel). 2020 Jan 30;13(3):618. doi: 10.3390/ma13030618.
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 CuO catalysts by ball milling, this technique can involve long preparation times and provide low yields. In this study, we synthesized a solid solution of CuO 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 CuO solid solution in the microwave-assisted degradation of dyes, namely rhodamine B, phenol red and methyl orange. The prepared CuO 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 CuO solid solution nanoparticles. Ball milling facilitates the relaxation of the CuO lattice and high-frequency electromagnetic radiation accelerates the diffusion of Fe atoms into the CuO crystal along the (111) crystal plane, quickly leading to the formation of a CuO solid solution.
环境水体受到有机污染物的污染给社会带来了重大挑战，人们已付出诸多努力来开发能够分解这些污染物的催化剂和方法。虽然已经有人致力于通过球磨法制备氧化铜催化剂，但该技术可能耗时较长且产率较低。在本研究中，我们在水相条件下，于40°C以下通过高频电场辅助球磨仅一步法在22小时内合成了氧化铜固溶体。我们研究了所制备的氧化铜固溶体在微波辅助降解罗丹明B、酚红和甲基橙等染料中的催化活性。所制备的氧化铜固溶体具有很高的催化活性，能在2分钟内完全降解上述染料。发现一维扩散模型和相边界（平面）模型能很好地描述动力学。球磨与高频电磁场之间的协同作用在氧化铜固溶体纳米颗粒的制备中起关键作用。球磨促进了氧化铜晶格的弛豫，高频电磁辐射加速了铁原子沿（111）晶面扩散进入氧化铜晶体，迅速导致氧化铜固溶体的形成。
