Unexpected high performance of Fe-based nanocrystallized ribbons for azo dye decomposition

Abstract

Fe-based multiphase nanocrystallized ribbons (CR-II) prepared by annealing of metallic glasses show unexpected high performance for Orange II degradation.

The Pivotal Role of Boron in Improving the Azo Dye Degradation of Glassy Fe‐based Catalysts

“…It was found that more boron content corresponded to a higher degradation efficiency. Although the result is different from Yao's experiments on Fe−B alloys, it is consistent with recent studies of Fe‐based system . This result, together with our previous one, confirmed that the addition of boron, regardless of crystallinity, can improve the degradation efficiency, and the crystalline composition had slightly better efficiency than the Fe‐based glasses.…”

“…In order to evaluate the stability of amorphous iron‐based catalysts, structural relaxation and crystallization experiments have been carried out by many research groups . Xie et al.…”

“…While there is growing evidence that the degradation efficiency of amorphous alloys can be improved by complete crystallization, the factors controlling this phenomenon are not yet clear. Some researchers have suggested that annealing to achieve a large grain size is the key factor favoring the reaction rate, while others have found nano‐crystallization also has an excellent degradation effect . Actually, many considerations should be examined to elucidate the degradation mechanisms for amorphous and crystalline iron alloys and possible interactions between the amorphous and crystalline phases in the degradation process cannot be ignored.…”

Rapid Degradation of Azo Dyes by Melt-Spun Mg-Zn-Ca Metallic Glass in Artificial Seawater

“…Xie et al [13] reported that Fe heterogeneity improves the degradation capability of Fe 76 B 12 Si 9 Y 3 amorphous powders, which has been attributed to the accelerated corrosion of the Fe-rich region, which tends to lose electrons. Similarly, the nanocrystals in Fe-based amorphous composite alloys can also induce the fast corrosion of α-Fe, and were found to significantly improve degradation efficiency [7,14]. That is to say, the accelerated corrosion of MG is beneficial to the fast degradation of azo dyes, and therefore needs further investigation with respect to other MG alloys.…”

“…Different fabrications usually induce different statuses of MG products, which may strongly affect the efficiency of the MG. Powders, glassy thin films [4] or melt-spun ribbons [5][6][7] are also used in water treatments. Melt spinning is a widely used technology in typical industrial fields [8,9], and thus the ribbons are easy to fabricate.…”