Activation of Oxygen and Hydrogen Peroxide by Copper(II) Coupled with Hydroxylamine for Oxidation of Organic Contaminants

详细信息    查看全文

• 作者：Hongshin Lee ; Hye-Jin Lee ; Jiwon Seo ; Hyung-Eun Kim ; Yun Kyung Shin ; Jae-Hong Kim ; Changha Lee
• 刊名：Environmental Science & Technology
• 出版年：2016
• 出版时间：August 2, 2016
• 年：2016
• 卷：50
• 期：15
• 页码：8231-8238
• 全文大小：426K
• 年卷期：0
• ISSN：1520-5851

文摘

This study reports that the combination of Cu(II) with hydroxylamine (HA) (referred to herein as Cu(II)/HA system) in situ generates H₂O₂ by reducing dissolved oxygen, subsequently producing reactive oxidants through the reaction of Cu(I) with H₂O₂. The external supply of H₂O₂ to the Cu(II)/HA system (i.e., the Cu(II)/H₂O₂/HA system) was found to further enhance the production of reactive oxidants. Both the Cu(II)/HA and Cu(II)/H₂O₂/HA systems effectively oxidized benzoate (BA) at pH between 4 and 8, yielding a hydroxylated product, p-hydroxybenzoate (pHBA). The addition of a radical scavenger, tert-butyl alcohol, inhibited the BA oxidation in both systems. However, electron paramagnetic resonance (EPR) spectroscopy analysis indicated that ^•OH was not produced under either acidic or neutral pH conditions, suggesting that the alternative oxidant, cupryl ion (Cu(III)), is likely a dominant oxidant.