摘要
掌握Fe^(2+)/H_2O_2体系O_2的生成路径,可为避免H_2O_2无效分解,开发经济高效的Fe^(2+)/H_2O_2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Fe^(2+)/H_2O_2体系内各种自由基对O_2生成速率的影响,进而确定O_2的生成路径。结果表明:Fe^(2+)/H_2O_2体系内不会产生大量O_2^-·,O_2^-·不是生成O_2的主要反应物质;·OH被全部捕获后,体系中仍产生大量HO_2·,但此时无O_2生成,证明生成O_2的反应由·OH和HO_2·两种自由基直接参与。分析认为反应·OH+HO_2=H_2O+O_2是Fe^(2+)/H_2O_2体系内O_2生成的主要路径。控制Fe^(2+)/H_2O_2体系定向生成·OH,抑制HO_2·的产生,是提高Fe^(2+)/H_2O_2体系中H_2O_2利用率的有效手段。
It is important to understand the O_2 generation path in Fe^（2＋）/H_2O_2 system to avoid invalid decomposition of H_2O_2 and to reduce the cost of pollutants degradation technology using Fe^（2＋）/H_2O_2 system. In this paper, radical scavengers were adopted to investigate the roles of different radicals on the generation of O_2 in Fe^（2＋）/H_2O_2 system. The results showed that there were few 2O-i in Fe2＋/H2O2 system, and O_2^-· was not the main reagent to generate O_2. After iOH was captured, the generation rate of H_2O· was still high, however, there was no O_2 generation. This indicated that iOH and H_2O· took part in the reaction to generate O_2 directly. ·OH ＋HO_2·=H_2O＋O_2 is the main reaction path to generate O_2. Controling H_2O_2 decomposition path towards OH· and restraining the production of H_2O· were the effective ways to increase the utilization rate of H_2O_2.
出处
《化工学报》
EI
CAS
CSCD
北大核心
2016年第6期2625-2630,共6页
CIESC Journal
基金
黑龙江省教育厅项目(12541093)~~
