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Materials 2017, 10(9), 1001; doi:10.3390/ma10091001

Enhanced Azo-Dyes Degradation Performance of Fe-Si-B-P Nanoporous Architecture

1
School of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing 210094, China
2
School of Chemical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China
3
College of Materials Science and Engineering, Nanjing TECH University, Nanjing 210009, China
*
Authors to whom correspondence should be addressed.
Received: 24 July 2017 / Revised: 23 August 2017 / Accepted: 25 August 2017 / Published: 27 August 2017
(This article belongs to the Section Porous Materials)
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Abstract

Nanoporous structures were fabricated from Fe76Si9B10P5 amorphous alloy annealed at 773 K by dealloying in 0.05 M H2SO4 solution, as a result of preferential dissolution of α-Fe grains in form of the micro-coupling cells between α-Fe and cathodic residual phases. Nanoporous Fe-Si-B-P powders exhibit much better degradation performance to methyl orange and direct blue azo dyes compared with gas-atomized Fe76Si9B10P5 amorphous powders and commercial Fe powders. The degradation reaction rate constants of nanoporous powders are almost one order higher than those of the amorphous counterpart powders and Fe powders, accompanying with lower activation energies of 19.5 and 26.8 kJ mol−1 for the degradation reactions of methyl orange and direct blue azo dyes, respectively. The large surface area of the nanoporous structure, and the existence of metalloids as well as residual amorphous phase with high catalytic activity are responsible for the enhanced azo-dyes degradation performance of the nanoporous Fe-Si-B-P powders. View Full-Text
Keywords: dealloying; nanoporous structure; azo dyes; degradation; amorphous alloys dealloying; nanoporous structure; azo dyes; degradation; amorphous alloys
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Weng, N.; Wang, F.; Qin, F.; Tang, W.; Dan, Z. Enhanced Azo-Dyes Degradation Performance of Fe-Si-B-P Nanoporous Architecture. Materials 2017, 10, 1001.

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