O2 generation path in Fe2+/H2O2 system

doi:10.11949/j.issn.0438-1157.20151820

Abstract

Abstract:

It is important to understand the O₂ generation path in Fe²⁺/H₂O₂ system to avoid invalid decomposition of H₂O₂ and to reduce the cost of pollutants degradation technology using Fe²⁺/H₂O₂ system. In this paper, radical scavengers were adopted to investigate the roles of different radicals on the generation of O₂ in Fe²⁺/H₂O₂ system. The results showed that there were few O₂^-· in Fe²⁺/H₂O₂ system, and O₂^-· was not the main reagent to generate O₂. After ·OH was captured, the generation rate of HO₂· was still high, however, there was no O₂ generation. This indicated that ·OH and HO₂· took part in the reaction to generate O₂ directly. ·OH+HO₂·-H₂O O₂ is the main reaction path to generate ;O₂. Controling H₂O₂ decomposition path towards ·OH and restraining the production of HO₂· were the effective ways to increase the utilization rate of H₂O₂.

Key words: Fe(Ⅱ)/H₂O₂ system, invalid decomposition, O₂, radical

摘要：

掌握Fe²⁺/H₂O₂体系O₂的生成路径,可为避免H₂O₂无效分解,开发经济高效的Fe²⁺/H₂O₂体系利用技术指明方向。采用添加自由基捕获剂的方法,探究Fe²⁺/H₂O₂体系内各种自由基对O₂生成速率的影响,进而确定O₂的生成路径。结果表明:Fe²⁺/H₂O₂体系内不会产生大量O₂^-·,O₂^-·不是生成O₂的主要反应物质;O₂^-·被全部捕获后,体系中仍产生大量O₂^-·,但此时无O₂生成,证明生成O₂的反应由·OH和HO₂·两种自由基直接参与。分析认为反应·OH+HO₂·-H₂O+O₂是体系内O₂生成的主要路径。控制Fe²⁺/H₂O₂体系定向生成·OH,抑制HO₂·的产生,是提高Fe²⁺/H₂O₂体系中H₂O₂利用率的有效手段。

关键词: Fe²⁺/H₂O₂体系, 无效分解, O₂, 自由

CLC Number:

O643

ZHAO Haiqian, GAO Xingcun, WANG Zhonghua, GAO Jihui. O₂ generation path in Fe²⁺/H₂O₂ system[J]. CIESC Journal, 2016, 67(6): 2625-2630.

赵海谦, 高杏存, 王忠华, 高继慧. Fe²⁺/H₂O₂体系O₂生成路径[J]. 化工学报, 2016, 67(6): 2625-2630.

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O₂ generation path in Fe²⁺/H₂O₂ system

Fe²⁺/H₂O₂体系O₂生成路径

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