Abstract:Metallic glasses (MG) have attracted significance attention in the field of azo dye degradation, due to their excellent catalytic performance. However, the catalytic performance deterioration significantly, once metallic glass loss metastable structure by external stimulation, like annealing treatment. To obtain an Fe-based MG with good stability against structure evolution, here, minor doping Cu of Fe-based MG with an inhomegeneous structure in which nano copper clusters are distributed on the amorphous substrate was prepared. The effect of structure evolution on the degradation performance of Fe-Si-B-Cu was studied by annealing treatment and then degradation of azo dye. After the isothermal annealing treatment at various temperature from 300 ℃ to 800 ℃, although crystallization began to occur after annealing of Fe-Si-B-Cu from 380 ℃ after annealing treatment and obtained nanocrystalline alloys. The casting state, annealing amorphous state and annealing nanocrystallization sample are used to degrade the dye, and study the impact of the cast state and annealing temperature (Ta) on degradation performance. The results showed the degradation performance of Fe-based MG towards azo dye slightly improved with the annealing temperature increasing, instead of decrease significantly as previous reported. Among them, the sample annealed at 450 ℃ showed the best degradation performance, as indicated by a degradation rate of up to 0.164 min-1 and a degradation efficiency of 100% at 40 min. Therefore, introducing nano-heterostructures provides an effective way to stabilize the catalytic performance of MG alloys against structure evolution by annealing treatment.