Vacuum processing pressure and degradation performance of FePC ribbons in methylene blue solution

The commercial Fe85P5C10 ribbons were refabricated by the melt-spinning machine equipped with vacuum chamber. We controlled the residual pressure after vacuum processing (Pva) in vacuum chamber and investigated the influence of Pva on the microstructure and degradation performance for Methylene Blue (MB) dye. The amorphous formation ability of FePC was enhanced at low vacuuming level and full amorphous ribbons can be obtained at 0.1 and 10 Pa. The amorphous ribbons have a higher degradation efficiency (η) in MB solution than crystalline ribbons, which can be further improved by adjusting the pH to the level pH = 2 and 3. The amorphous ribbons obtained at Pva = 10 Pa has a higher η than that at 0.1 Pa. The surface morphology and chemical state of the reacted surfaces indicate that the higher η of the former is ascribed to its finer 3D nanostructures and stronger galvanic effect of Fe-P/Fe-C bonds.