Role of Nanocrystallites of Al-Based Glasses and H2O2 in Degradation Azo Dyes.

Qi Chen,Hao Zhang,Weimin Wang,KiBuem Kim,Zhicheng Yan

doi:10.3390/ma14010039

Qi Chen, Hao Zhang + Show 3 more

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https://doi.org/10.3390/ma14010039

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Journal: Materials	Publication Date: Dec 24, 2020
Citations: 4	License type: CC BY 4.0

Affiliation: Shandong University, Sejong University

Abstract

Al-based metallic glasses have a special atomic structure and should have a unique degradation ability in azo dye solutions. The Al88Ni9Y3 (Y3), Al85Ni9Y6 (Y6) and Al82Ni9Y9 (Y9) glassy ribbons are melt spun and used in degrading methyl orange (MO) azo dye solution with adding H2O2. With increasing cY, 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 H2O2, 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 H2O2 are effective methods to improve the degradation ability of Al-based glasses in azo dye solutions.

Highlights

In recent years, azo dyes have been widely used in domestic textile, leather, dye and other industries
We studied the reactivity of Al88Ni9Y3 (Y3), Al85Ni9Y6 (Y6) and Al82Ni9Y9 (Y9) ribbons in degrading methyl orange (MO) azo dye solution
The Y3 ribbon has α-Al, AlNi and amorphous cluster phases in the TEM image (Figure 1b), the results show that the Y3 ribbon has semi-amorphous structure

Summary

Introduction

Azo dyes have been widely used in domestic textile, leather, dye and other industries. A lot of research has been done to deal with azo dye pollution, including physical adsorption of activated carbon and clays [7,8], microbial treatment [9], advanced oxidation technology [10,11,12,13] and specific alloy degradation [14,15,16,17,18,19], etc. These methods have obvious shortcomings, namely being short-term solutions and having low efficiency and high cost. The content of diffusion limitation in the kinetics involved in the catalytic degradation process has a certain influence on the degradation rate [43]

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Discussion

Conclusion