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首页> 外文期刊>Environmental Science & Technology >Triplet-State Photochemistry of Dissolved Organic Matter: Triplet-State Energy Distribution and Surface Electric Charge Conditions
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Triplet-State Photochemistry of Dissolved Organic Matter: Triplet-State Energy Distribution and Surface Electric Charge Conditions

机译：溶解有机物的三重态光化学：三重态能量分布和表面电荷条件

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Excited triplet states of chromophoric dissolved organic matter ((CDOM)-C-3*) are highly reactive species in sunlit surface waters and play a critical role in reactive oxygen species (ROS) formation and pollutant attenuation. In the present study, a series of chemical probes, including sorbic acid, sorbic alcohol, sorbic amine, trimethylphenol, and furfuryl alcohol, were employed to quantitatively determine (CDOM)-C-3* and O-1(2) in various organic matters. Using a high concentration of sorbic alcohol as high-energy triplet states quencher, (CDOM)-C-3* can be first distinguished as high-energy triplet states (250 kJ mol(-1)) and low energy triplet states (250 kJ mol(-1)). The terrestrial-origin natural organic matter (NOM) was found to mainly consist of low-energy triplet states, while high-energy triplet states were predominant in autochthonous-origin NOM and effluent/wastewater organic matter (EfOM/WWOM). The O-1(2) quantum yields and electron transfer quantum yield coefficients (f(Tmp)) generated from low-energy triplet states remained constant in all tested organic matters. External phenolic compound showed quenching effects on triplet-state formation and tended to have a higher quenching efficiency for aromatic ketone triplet states, which are the main high-energy triplet states. In comparison with terrestrial-origin NOM, autochthonous-origin NOM and EfOM/WWOM presented lower reaction rate constants for sorbic amines and higher reaction rate constants for sorbic acid, and these differences are likely due to dissimilar surface electric charge conditions. Understanding the triplet-state photochemistry of CDOM is essential for providing useful insights into their photochemical effects in aquatic systems.
机译：发色溶解有机物（（CDOM）-C-3 *）的激发三重态在阳光照射的地表水中是高反应性物种，在反应性氧物种（ROS）形成和污染物衰减中起关键作用。在本研究中，采用了一系列化学探针，包括山梨酸，山梨醇，山梨胺，三甲基苯酚和糠醇，来定量测定各种有机物中的（CDOM）-C-3 *和O-1（2）很重要。使用高浓度的山梨醇作为高能三重态猝灭剂（CDOM）-C-3 *首先可以区分为高能三重态（> 250 kJ mol（-1））和低能三重态（< 250 kJ mol（-1））。陆源天然有机物（NOM）主要由低能三重态构成，而高能三重态在原生土NOM和废水/废水有机物（EfOM / WWOM）中占主导地位。由低能三重态产生的O-1（2）量子产率和电子转移量子产率系数（f（Tmp））在所有测试的有机物中均保持恒定。外部酚类化合物对三重态的形成表现出猝灭作用，并且对芳族酮三重态（这是主要的高能三重态）倾向于具有更高的猝灭效率。与陆地来源的NOM相比，本地来源的NOM和EfOM / WWOM对山梨胺的反应速率常数较低，而对山梨酸的反应速率常数较高，这些差异可能是由于表面电荷条件不同所致。了解CDOM的三重态光化学对于提供有用的见解对其在水生系统中的光化学作用至关重要。

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  • 来源
    《Environmental Science & Technology》 |2019年第5期|2482-2490|共9页
  • 作者

    Zhou Huaxi; Yan Shuwen; Lian Lushi; Song Weihua;

  • 作者单位

    Fudan Univ, Dept Environm Sci & Engn, Shanghai 200433, Peoples R China;

    Fudan Univ, Dept Environm Sci & Engn, Shanghai 200433, Peoples R China|Shanghai Inst Pollut Control & Ecol Secur, Shanghai 200092, Peoples R China;

    Fudan Univ, Dept Environm Sci & Engn, Shanghai 200433, Peoples R China;

    Fudan Univ, Dept Environm Sci & Engn, Shanghai 200433, Peoples R China|Shanghai Inst Pollut Control & Ecol Secur, Shanghai 200092, Peoples 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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