Excellent performance of Fe₇₈Si₉B₁₃ metallic glass for activating peroxymonosulfate in degradation of naphthol green B

The functional application of metallic glasses in the catalytic field has widely attracted research attention due to its unique atomic structure compared to crystalline materials. It has been reported that metallic glasses can effectively activate H₂O₂ and persulfate, yet the activation of peroxymonosulfate by metallic glasses is not studied well. In this work, the metallic glass with atomic composition of Fe₇₈Si₉B₁₃ was applied for investigating the peroxymonosulfate (PMS) activation on degradation of naphthol green B (NGB) dye. The change of surface morphology indicated the important role of oxide films during the dye degradation. The effects and first-order kinetics model of various reaction parameters were evaluated systematically, including PMS concentration, catalyst dosage, irradiation intensity, and dye concentration. The results showed that about 98% of the dye removal rate could be achieved only within 10 min under rational conditions. The reaction kinetics k of 0.1339 min^-1 without ribbons was sharply improved to 0.3140 min^-1 by adding 0.5 g/L ribbons, indicating the superior activation ability of Fe₇₈Si₉B₁₃ metallic glass. The recycling experiment revealed that the Fe₇₈Si₉B₁₃ ribbons exhibited the excellent surface stability and catalytic reusability for activating PMS even after reused for 10th run.