J. Mater. Sci. Technol. ›› 2017, Vol. 33 ›› Issue (10): 1147-1152.DOI: 10.1016/j.jmst.2017.01.024

• Orginal Article • Previous Articles     Next Articles

Mechanism and kinetics of treatment of acid orange II by aged Fe-Si-B metallic glass powders

Qin Xindongab, Li Zhengkuna, Zhu Zhengwanga(), Fu Huamenga, Li Honga, Wang Aimina, Zhang Hongweia, Zhang Haifenga()   

  1. aInstitute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
    bSchool of Materials Science and Engineering, University of Science and Technology of China, Hefei 230026, China
  • Received:2016-11-16 Revised:2016-12-27 Accepted:2017-01-04 Online:2017-10-25 Published:2018-01-25
  • About author:

    1 These two authors contributed equally to this paper.

Abstract:

The mechanism and kinetics of acid orange II (AOII) treated by aged gas-atomized Fe-Si-B metallic glass (MG) powders were investigated in this study. The decolorization reaction is shown to obey the pseudo-first-order kinetic model, and the treatment processes could be divided into two stages: a slow step followed by a rapid one. This observation is in accordance with the following results, the azo dye is simply adsorbed onto the Fe-based MG powders in the initial stage, because the oxide layer coated on the powder surface depresses the degradation reaction by covering the activity sites, and then the degradation occurs with the desquamation of the powders. The AOII could be degraded with a rapid reaction rate when the Fe-based MG powders are applied to the treatment process again, because of the consumption of the oxide layer and the unchanged core of the Fe-based MGs. These findings will promote the practical application of MGs in degrading azo dyes.

Key words: Metallic glasses, Azo dyes, Degradation, Kinetics