| 摘要: |
| 【目的】针对1,2-二氟-1,1,2,2-四氯乙烷（F112）具有高能量碳氟键，很难被光解、水解及微生物降解的特点，研究紫外光条件下类Fenton氧化法催化F112脱氟的最佳条件，旨在为含氟有机物的降解提供参考。【方法】在紫外线高压汞灯的作用下，以类Fenton氧化法中的Fe3+/H2O2为催化剂，研究溶液初始pH、Fe3+投加量、H2O2投加量、反应温度、紫外光源与溶液距离对F112脱氟率的影响。【结果】在溶液初始pH=1、Fe3+投加量为7.5 mmol/L、H2O2投加量为500 mmol/L、反应温度40 ℃、紫外光源与液面距离为12 cm的条件下，F112脱氟率均最大，脱氟效果均最佳。【结论】得到了紫外光条件下类Fenton氧化法催化F112脱氟的最佳条件，为含氟有机物的降低提供了参考。 |
| 关键词: 紫外光 类Fenton氧化法 Fe3+/H2O2 脱氟率 1,2-二氟-1,1,2,2-四氯乙烷 |
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| 基金项目:陕西杨凌现代农业研究项目；陕西延长石油（集团）有限责任公司科研攻关项目（ycsy2011ky-B-52） |
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| Defluorination reaction of 1,2-difluoro-1,1,2,2-tetrachloroethane catalyzed by UV light-assisted Fenton method |
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| Abstract: |
| 【Objective】As the high-energy carbon-fluorine bond in 1,2-difluoro-1,1,2,2-tetrachloroethane (F112) is extremely difficult be degraded by photolysis,hydrolysis,or biodegradation,this study under UV light Fenton oxidation catalysis aimed to attain the best F112 defluorination conditions.【Method】In this paper,defluorination of F112 was conducted using Fe3+/H2O2 of Fenton oxidation as catalyst with the presence of ultraviolet high-pressure mercury lamp.The effects of initial pH,amount of Fe3+,H2O2 added,reaction temperature,distance from the UV light sources to F112 defluorination rates were studied.【Result】Results shows that best F112 defluorination rate was obtained with initial pH=1,Fe3+ added 7.5 mmol/L,H2O2 added 500 mmol/L,temperature=40 ℃,and the distance of reaction surface to light source=12 cm.【Conclusion】The experiment obtained the best conditions under UV light Fenton oxidation catalysis for F112 photocatalytic defluorination. |
| Key words: UV light Fenton method Fe3+/H2O2 defluorination rate 1,2-difluoro-1,1,2,2-tetrachloroethane |
