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

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.

Application of Fe-Based Amorphous Alloy in Industrial Wastewater Treatment: A Review

“…Through the redox potential of MGs in dye wastewater, some researchers explained the deep reason why the k obs of MGs is higher and ΔE is lower. Weng et al [64] measured that the redox potentials of Fe 85 B 15 AP and Fe 76 Si 9 B 10 P 5 AP in methyl orange solution are −0.47 V and −0.45 V, respectively, which are lower than the redox potential of ZVI −0.437 V. Therefore, Fe 85 B 15 AP and Fe 76 Si 9 B 10 P 5 AP have stronger reductivity. Zhang et al [55] measured The electrode potential of Fe-Si-B amorphous ribbons is lower than that of pure iron ribbons due to the presence of non-metallic elements Si and B in the amorphous ribbons.…”

Fabrication and Photocatalytic Activity of Cu2O Nanobelts on Nanoporous Cu Substrate

“…Both the degradation of MO and MB solutions by Cu 2 O@NP Cu catalysts follows the pseudo-first-order kinetic mode (C = C 0 exp(-k obs t), R 2 [ 0.95). The reaction rate constants k obs calculated from fitting results are 0.0624 min -1 and 0.0544 min -1 for MO and MB solutions, as given in Table 2, which are higher than graphene oxide-or Febased amorphous powders, due to the difference in degradation mechanism [19,33].…”

“…The homogeneous microstructure of the amorphous precursor is beneficial to the formation of nanoporous structure uniformly. Recently, different nanoporous metals such as NP Cu [16,17], NP Pd [18] and NP Fe [19] have been fabricated from amorphous precursors. Additionally, more researchers have paid much attention to developing low-cost nanoporous metals [16,17,19], which are low cost, no toxicity, good stability and high catalytic performance.…”

Refinement of Nanoporous Cu by Polyvinylpyrrolidone and Photodegradation of Methyl Orange by Cu2O Nanowires and Nanoporous Cu Photocatalysts

“…Many noble nanoporous Au [11], Pd [12], and Pt [13] with high catalytic activities have been reported. Many researchers have contributed to functionalizing low-cost nanoporous metals and their composites, such as NP Cu [14] and Fe [15]. Nanoporous structures with smaller pore sizes have been reported to exhibit a superior catalytic performance [16].…”