Strong Enhancement on Fenton Oxidation by Addition of Hydroxylamine to Accelerate the Ferric and Ferrous Iron Cycles
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- 作者：Liwei. Chen ; Jun. Ma ; Xuchun. Li ; Jing. Zhang ; Jingyun. Fang ; Yinghong. Guan ; Pengchao. Xie
- 刊名：Environmental Science & Technology
- 出版年：2011
- 出版时间：May 1, 2011
- 年：2011
- 卷：45
- 期：9
- 页码：3925-3930
- 全文大小：760K
- 年卷期：v.45,no.9(May 1, 2011)
- ISSN：1520-5851
文摘
The Fenton system generates reactive species with high oxidation potential such as hydroxyl radicals (HO鈥?/sup>) or ferryl via the reaction between Fe (II) and H2O2. However, a number of drawbacks limit its widespread application including the accumulation of Fe (III) and the narrow pH range limits, etc. The aim of this study is to propose a much more efficient Fenton-HA system which is characterized by combining Fenton system with hydroxylamine (NH2OH), a common reducing agent, to relieve the aforementioned drawbacks, with benzoic acid (BA) as the probe reagent. The presence of NH2OH in Fenton鈥檚 reagent accelerated the Fe (III)/Fe (II) redox cycles, leading to relatively steady Fe (II) recovery, thus, increased the pseudo first-order reaction rates and expanded the effective pH range up to 5.7. The HO鈥?/sup> mechanism was confirmed to be dominating in the Fenton-HA system, and the generation of HO鈥?/sup> was much faster and the amount of HO鈥?/sup> formed was higher than that in the classical Fenton system. Furthermore, the major end products of NH2OH in Fenton-HA system were supposed to be NO3鈭?/sup> and N2O.