Effects of Sn Addition and Fe Content Adjustment on the Decolorization Performance of Fe-Si-B Amorphous Alloys for Azo Dyes.

This study compares the effects of adding Mo, Cu, and Sn elements on the decolorization performance of FeSiBM (M = Mo, Cu, or Sn) amorphous alloys. After the addition of Cu and Sn elements, the Fe-Si-B amorphous alloys generate three-dimensional (3D) petal-like nanostructured corrosion products during the decolorization process. These petal-like nanostructures possess a high specific surface area and excellent adsorption capacity, thereby effectively promoting the decolorization of dyes. Furthermore, the influence of Fe content variation on the decolorization performance of FeSiBCu (x = 0, 2, or 4) and FeSiBSn (x = 0, 2, or 4) alloys was investigated. The glass-forming ability of FeSiBCu alloys decreases with increasing Fe content, leading to the precipitation of α-Fe crystalline phases starting from FeSiBCu. As the crystallinity increases, the decolorization performance of the alloys gradually deteriorates. In contrast, the FeSiBSn alloys maintain their amorphous structure even with increasing Fe content, and their decolorization performance for Orange II improves accordingly. The high decolorization efficiency of FeSiBSn amorphous alloys for Orange II can be attributed to their unique self-refreshing properties.