Hydroxylamine enhanced activation of peroxymonosulfate by Fe(III)/Cu(II) bimetallic for high-efficiency degradation of AO7

In this study, a new type of iron/copper bimetallic combined with hydroxylamine (HA) activated peroxymonosulfate (PMS) was constructed to treat organic pollutants. Selecting the azo dye acid orange 7 (AO7) as the representative of organic pollutants, the new system can achieve nearly 100% degradatio...

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Veröffentlicht in:Water science and technology 2022-04, Vol.85 (7), p.2038-2050
Hauptverfasser: Zhang, Ming, Zhang, Kuo, Zhou, Runjuan, Wang, Jinpeng
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Sprache:eng
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Zusammenfassung:In this study, a new type of iron/copper bimetallic combined with hydroxylamine (HA) activated peroxymonosulfate (PMS) was constructed to treat organic pollutants. Selecting the azo dye acid orange 7 (AO7) as the representative of organic pollutants, the new system can achieve nearly 100% degradation of AO7 within 5 min. The Fe(III)/Cu(II)/HA/PMS system mainly generates SO4·− to achieve the degradation of AO7 in acidic environment, while neutral and alkaline environments rely on ·OH. The presence of hydroxylamine accelerates the cycle of Fe(III)/Fe(II) and Cu(II)/Cu(I) in the system, and enhances the degradation ability of the system for organic pollutants. The addition of trace Cu(II) (1 μM) enhances the ability of a single Fe(III)/HA/PMS system to degrade AO7 in neutral and alkaline environments without causing secondary copper pollution. The common inorganic anions Cl− and NO3− in water have almost no effect on the degradation of AO7 in the system. The constructed Fe(III)/Cu(II)/HA/PMS system is an efficient and clean organic pollutant wastewater treatment process, which has very promising application prospects.
ISSN:0273-1223
1996-9732
DOI:10.2166/wst.2022.109