College of Materials Science and EngineeringShenzhen UniversityShenzhen Engineering Laboratory for Advanced Technology of Ceramics and Shenzhen Key Laboratory of Special Functional Materials Shenzhen 518060 P. R. China
School of Mechanical and Manufacturing EngineeringUNSW Sydney NSW-2052 Australia
The Cover Feature shows the process and mechanism of the highly efficient degradation of azo dyes by Fe‐based catalytic characterized by three different galvanic cells. In their Full Paper, Shenghui Xie et al. describe how the electrode potential difference between the Fe‐rich cluster and Fe‐poor cluster in metal glass ensures a galvanic cell between them, defined here as a type 1 galvanic cell, which promote the Fe atoms in Fe‐rich clusters to lose electrons and promote the degradation reaction. Type 2 galvanic cells form between the ex‐added boron particle and Fe‐based metallic glass matrix, promoting the electrons loss in metallic glass and therefore accelerate the degradation. Type 3 galvanic cells can be generated between Fe and Fe‐B based compounds in the crystalline alloys through from annealing the metallic glass. Unexpectedly, it is the intermetallics (such as Fe2B, FeB and Fe5SiB2), not Fe, that denote electrons to promote degradation. The natural degradation of azo dyes is very slow. After introducing three different galvanic cells, the azo dyes are broken into small molecules rapidly and the water becomes clear. More information can be found in the Full Paper by Shenghui Xie et al..
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