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首页> 外文期刊>Environmental Science & Technology >Photochemical Effect of Humic Acid Components Separated Using Molecular Imprinting Method Applying Porphyrin-like Substances as Templates in Aqueous Solution
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Photochemical Effect of Humic Acid Components Separated Using Molecular Imprinting Method Applying Porphyrin-like Substances as Templates in Aqueous Solution

机译：以卟啉类物质为模板的分子印迹法分离腐殖酸成分的光化学效应

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摘要

To elucidate the relationship between photochemical functions with the structure of humic acids (HA), we developed a molecular imprinting method to separate the substances with given structure and investigated their photochemical behavior in aqueous solution. The substances with porphyrin-like core structure, such as chlorophyll or heme.were employed as template substances for preparing molecular imprinting polymers (MIP). The polymers were used to separate the substances with porphyrin-like structure from HA. Photochemical experiments were conducted to evaluate effects of the separated HA fractions on the photodegradation of coexisting organic pollutant The results showed that all fractions bound by MIP accelerated photochemical degradation of coexisting 2,4-dichlorophe-noxyacetic acid (2,4-D) under simulated sunlight (λ > 290 nm) irradiation, indicating that HA with porphyrin-like structure possesses better photoactivity than ones without the structure. The photochemical degradation of 2,4-D was enhanced when Fe(III), the ubiquitous element in natural aquatic systems, was added owing to the formation of Fe(III) complex with the HA. Electron paramagnetic resonance (EPR) spectra indicated that OH' and ~1O_2 radicals were generated in the solutions of HA fractions bound by MIP under simulated sunlight irradiation, implying that 2,4-D degradation could be related to oxidation reactions caused by reactive oxygen species (ROS).
机译：为了阐明光化学功能与腐殖酸（HA）结构之间的关系，我们开发了一种分子印迹方法来分离具有给定结构的物质，并研究了它们在水溶液中的光化学行为。将具有卟啉样核心结构的物质（例如叶绿素或血红素）用作模板物质，以制备分子印迹聚合物（MIP）。所述聚合物用于从HA分离具有卟啉样结构的物质。进行光化学实验以评估分离的HA馏分对共存有机污染物光降解的影响。结果表明，在模拟条件下，所有MIP结合的馏分均加速了共存的2,4-二氯苯氧乙酸（2,4-D）的光化学降解。日光（λ> 290 nm）照射，表明具有卟啉样结构的HA比没有结构的HA具有更好的光活性。当添加Fe（III）（天然水生系统中普遍存在的元素）时，由于与HA形成Fe（III）络合物，从而增强了2,4-D的光化学降解。电子顺磁共振（EPR）光谱表明，在模拟阳光照射下，MIP结合的HA组分溶液中生成了OH'和〜1O_2自由基，这表明2,4-D降解可能与活性氧引起的氧化反应有关（ROS）。

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  • 来源
    《Environmental Science & Technology》 |2010年第15期|p.5812-5817|共6页
  • 作者

    CHUNYAN YU; rnYAOBIN ZHANG; rnXIE QUAN; rnSHUO CHEN; rnHANBO HAN; rnXIAOXIA OU; rnJINCAI ZHAO;

  • 作者单位

    Key Laboratory of Industrial Ecology and Environmental Engineering (Ministry of Education), School of Environmental Science and Technology, Dalian University of Technology, Linggong Road 2, Dalian 116024, P. R. China National Marine Environmental Monitoring Center, Dalian 116023, P. R. China;

    rnKey Laboratory of Industrial Ecology and Environmental Engineering (Ministry of Education), School of Environmental Science and Technology, Dalian University of Technology, Linggong Road 2, Dalian 116024, P. R. China;

    rnKey Laboratory of Industrial Ecology and Environmental Engineering (Ministry of Education), School of Environmental Science and Technology, Dalian University of Technology, Linggong Road 2, Dalian 116024, P. R. China;

    rnKey Laboratory of Industrial Ecology and Environmental Engineering (Ministry of Education), School of Environmental Science and Technology, Dalian University of Technology, Linggong Road 2, Dalian 116024, P. R. China;

    rnNational Marine Environmental Monitoring Center, Dalian 116023, P. R. China;

    rnCollege of Life Science, Dalian Nationalities University, Dalian 116605, P. R. China;

    rnInstitute of Chemistry, Chinese Academy of Sciences,Beijing 100190, P. R. China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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