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首页> 外文期刊>Environmental Science & Technology >Importance of Sporopollenin Structure and Accessibility in the Sorption of Phenanthrene by Biota Spores and Pollens
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Importance of Sporopollenin Structure and Accessibility in the Sorption of Phenanthrene by Biota Spores and Pollens

机译：菌粉孢子和花粉吸附菲中孢粉的结构和可及性的重要性

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摘要

Although spores/pollens are so abundant and ubiquitous in the environment, the role of these natural organic matter concerning fate and transport of organic pollutants in the environment is neglected. Lipid-free fractions and sporopollenins were isolated from seven spores/pollens collected from lower and higher biota species and were characterized by elemental analysis, CO2 adsorption techniques, and advanced solid-state C-13 nuclear magnetic resonance spectroscopy. Then, the sorption isotherms of phenanthrene (Phen) on all the samples were investigated by a batch technique. The sporopollenins were a highly cross-linked polymer including alkyl carbon, poly(methylene) carbon, and aromatic carbon as well as oxygen functionalities; additionally, their sorption capacities (K-oc) for Phen reached up to 1 170 000 mL/g, suggesting that some of the sporopollenins were good biopolymeric sorbents for the removal of hydrophobic organic contaminants in aquatic media. A highly significant and positive correlation between the sorption capacity of Phen and the aliphaticity of the sporopollenins suggested that their structure was critical to Phen sorption. Meanwhile, the (O + N)/C atomic ratios and polar groups were significantly and negatively correlated with the sorption capacity of Phen, indicating that accessibility also played a significant role in the sorption process. Moreover, variable correlations between the sorption capacities (K-oc) and the micropore volumes of the spore/pollen fractions were observed. This study sheds light on the importance of the polarity, microporosity, and structure of sporopollenins in the sorption process of Phen.
机译：尽管孢子/花粉在环境中是如此丰富和无处不在，但这些天然有机物在环境中与命运和有机污染物的运输有关的作用却被忽略了。从低和高生物区系收集的七个孢子/花粉中分离出无脂质级分和孢粉，并通过元素分析，CO2吸附技术和先进的固态C-13核磁共振波谱进行表征。然后，采用分批技术研究了菲在所有样品上的吸附等温线。孢粉是一种高度交联的聚合物，包括烷基碳，聚（亚甲基）碳和芳族碳以及氧官能团。此外，它们对Phen的吸附能力（K-oc）高达1170 000 mL / g，这表明某些孢粉是良好的生物聚合物吸附剂，可去除水介质中的疏水性有机污染物。 Phen的吸附能力与孢粉的脂族性之间存在高度显着的正相关关系，表明其结构对Phen的吸附至关重要。同时，（O + N）/ C原子比和极性基团与Phen的吸附能力呈显着负相关，表明可及性在吸附过程中也起着重要作用。而且，观察到了吸附能力（K-oc）和孢子/花粉级分的微孔体积之间的可变相关性。这项研究揭示了孢粉的极性，微孔结构和结构在Phen吸附过程中的重要性。

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  • 来源
    《Environmental Science & Technology》 |2019年第24期|14285-14295|共11页
  • 作者

    Xu Decheng; Hu Shujie; Zhang Dainan; Xiong Yongqiang; Yang Yu; Ran Yong;

  • 作者单位

    Chinese Acad Sci Guangzhou Inst Geochem State Key Lab Organ Geochem Guangzhou 510640 Guangdong Peoples R China|Univ Chinese Acad Sci Beijing 100049 Peoples R China;

    Chinese Acad Sci Guangzhou Inst Geochem State Key Lab Organ Geochem Guangzhou 510640 Guangdong 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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