| Summary: | Al-based metallic glasses have a special atomic structure and should have a unique degradation ability in azo dye solutions. The Al<sub>88</sub>Ni<sub>9</sub>Y<sub>3</sub> (Y3), Al<sub>85</sub>Ni<sub>9</sub>Y<sub>6</sub> (Y6) and Al<sub>82</sub>Ni<sub>9</sub>Y<sub>9</sub> (Y9) glassy ribbons are melt spun and used in degrading methyl orange (MO) azo dye solution with adding H<sub>2</sub>O<sub>2</sub>. With increasing <i>c</i><sub>Y</sub>, the as-spun ribbons have an increasing GFA (glass formability) and gradually decreased the degradation rate of MO solution. TEM (transmission electron microscopy) results show that the Y3 ribbon has nano-scale crystallites, which may form the channels to transport elements to the surface for degrading the MO solution. After adding H<sub>2</sub>O<sub>2</sub>, the degradation efficiency of Al-based glasses is improved and the Y6 ribbon has formed nano-scale crystallites embedded in the amorphous matrix and it has the largest improvement in MO solution degradation. These results indicate that forming nano-scale crystallites and adding H<sub>2</sub>O<sub>2</sub> are effective methods to improve the degradation ability of Al-based glasses in azo dye solutions.
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