Jin Rui, Wang Gaojiong, Wang Xin, Yang Wei, Qi Yumin
Hebei Key Laboratory of New Functional Materials, School of Material Science and Engineering, Hebei University of Technology, No. 5340, Xiping Road, Beichen District, Tianjin 300401, China.
Materials (Basel). 2023 Mar 9;16(6):2201. doi: 10.3390/ma16062201.
Mg-based metallic glass (MG) has attracted extensive attention in the field of wastewater treatment due to its high decolorization rate in degrading azo dyes. However, the azo dye degradation rate of Mg-based MGs is strongly dependent on the particle size. Improving the intrinsic degradation efficiency using large particles is of great interest for future applications. In this work, in-situ metallic glass matrix composites (MGMCs) with high Mg content were successfully prepared by melt spinning. It is found that when the Mg content is 79-82%, the as-spun sample shows typical glassy characteristics. The SEM and XRD tests confirm that the as-spun sample is composed of α-Mg dendrite, multiple Mg-Zn intermetallic particles and an MG matrix. The degradation experiment using Direct Blue 6 and a 500 μm particle sample demonstrate that the MgZnCaSr MGMC sample degrades azo dyes faster than typical Mg-Zn-Ca MG alloy. It can be attributed to the galvanic cell effect on the α-Mg/MG interface, which reduces the waste of active Mg atoms in the MG matrix according to the corrosion protection mechanism by the α-Mg anode sacrifice. This result provides a new perspective and insight into the design of azo dye degradation alloys and the understanding of degradation mechanisms.
镁基金属玻璃（MG）由于在降解偶氮染料方面具有较高的脱色率，在废水处理领域引起了广泛关注。然而，镁基金属玻璃的偶氮染料降解率强烈依赖于粒径。使用大颗粒提高其固有降解效率对未来应用具有重要意义。在这项工作中，通过熔体纺丝成功制备了高镁含量的原位金属玻璃基复合材料（MGMCs）。研究发现，当镁含量为79 - 82%时，初生纺丝样品呈现出典型的玻璃态特征。扫描电子显微镜（SEM）和X射线衍射（XRD）测试证实，初生纺丝样品由α - 镁枝晶、多种镁锌金属间化合物颗粒和一个MG基体组成。使用直接蓝6和一个500μm颗粒样品进行的降解实验表明，MgZnCaSr MGMC样品对偶氮染料的降解速度比典型的Mg - Zn - Ca MG合金更快。这可归因于α - 镁/MG界面上的原电池效应，根据α - 镁阳极牺牲的腐蚀保护机制，减少了MG基体中活性镁原子的浪费。这一结果为偶氮染料降解合金的设计以及降解机制的理解提供了新的视角和见解。
