Production of Hydroxyl Radical via the Activation of Hydrogen Peroxide by Hydroxylamine

详细信息    查看全文

• 作者：Liwei Chen ; Xuchun Li ; Jing Zhang ; Jingyun Fang ; Yanmin Huang ; Ping Wang ; Jun Ma
• 刊名：Environmental Science & Technology
• 出版年：2015
• 出版时间：September 1, 2015
• 年：2015
• 卷：49
• 期：17
• 页码：10373-10379
• 全文大小：408K
• ISSN：1520-5851

文摘

The production of the hydroxyl radical (HO路) is important in environmental chemistry. This study reports a new source of HO路 generated solely from hydrogen peroxide (H₂O₂) activated by hydroxylamine (HA). Electron paramagnetic resonance analysis and the oxidation of a HO路 probe, benzoic acid, were used to confirm the production of HO路. The production of HO路 increased with increasing concentrations of either HA or H₂O₂ as well as decreasing pH. The second-order rate constant for the reaction was (2.2 卤 0.2) 脳 10^鈥? M^鈥? s^鈥?. HO路 was probably produced in two steps: the activation of H₂O₂ by protonated HA and then reaction between the H₂O₂ and the intermediate protonated aminoxyl radical generated in the first step. Such a two-step oxidation can possibly be ascribed to the ionizable hydroxyl moiety in the molecular structure of HA, as is suggested by comparing the reactivity of a series of HA derivatives in HO路 production. The results shed light on a previously unknown source of HO路 formation, which broadens the understanding of its role in environmental processes.