Highly efficient degradation of acid orange Ⅱ on a defect-enriched Fe-based nanoporous electrode by the pulsed square-wave method

• 作者: Yuchen Chi Feng Chen Hangning Wang Fengxiang Qin Haifeng Zhang
• 来源期刊: 材料科学技术（英文版）
• 年，卷（期）: 2021,（33）
• 页码范围: 40-50
• 页数: 11页
• 语种: 英文

摘要

The degradation of acid orange Ⅱ(AO Ⅱ)by a nanoporous Fe-Si-B(NP-FeSiB)electrode under the pulsed square-wave potential has been investigated in this research.Defect-enriched NP-FeSiB electrode was fab-ricated through dealloying of annealed Fe76Si9B15 amorphous ribbons.The results of UV-vis spectra and FTIR indicated that AO Ⅱ solution was degraded efficiently into unharmful molecules H2O and CO2 on NP-FeSiB electrode within 5 mins under the square-wave potential of±1.5 V.The degradation efficiency of the NP-FeSiB electrode remains 98.9％even after 5-time recycling.The large amount of active surface area of the nanoporous FeSiB electrode with lattice disorders and stacking faults,and alternate electrochemical redox reactions were mainly responsible for the excellent degradation performance of the NP-FeSiB elec-trode.The electrochemical pulsed square-wave process accelerated the redox of Fe element in Fe-based nanoporous electrode and promoted the generation of hydroxyl radicals(·OH)with strong oxidizability as predominant oxidants for the degradation of azo dye molecules,which was not only beneficial to improv-ing the catalytic degradation activity,but also beneficial to enhancing the reusability of the nanoporous electrode.This work provides a highly possibility to efficiently degrade azo dyes and broadens the appli-cation fields of nanoporous metals.