State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry , Chinese Academy of Sciences , Guangzhou 510640 , China.
University of Chinese Academy of Sciences , Beijing 100049 , China.
Environ Sci Technol. 2019 Dec 17;53(24):14285-14295. doi: 10.1021/acs.est.9b03911. Epub 2019 Oct 16.
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, CO adsorption techniques, and advanced solid-state C 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 () 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 () 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.
尽管孢子/花粉在环境中如此丰富和普遍，但这些天然有机物在环境中有机污染物的归宿和迁移中的作用却被忽视了。从采集自低等生物和高等生物的七种孢子/花粉中分离出无脂部分和孢粉素，并通过元素分析、CO 吸附技术和先进的固态 C 核磁共振波谱进行了表征。然后，通过批量技术研究了所有样品对菲（Phen）的吸附等温线。孢粉素是一种高度交联的聚合物，包含烷基碳、聚亚甲基碳和芳基碳以及含氧官能团；此外，它们对 Phen 的吸附容量（）高达 1170000mL/g，这表明一些孢粉素是去除水介质中疏水性有机污染物的良好生物高分子吸附剂。Phen 的吸附容量与孢粉素的脂肪族性之间存在高度显著的正相关关系，这表明其结构对 Phen 的吸附至关重要。同时，（O + N）/C 原子比和极性基团与 Phen 的吸附容量呈显著负相关，表明可及性在吸附过程中也起着重要作用。此外，还观察到 Phen 的吸附容量与孢子/花粉部分的微孔体积之间存在可变的相关性。本研究阐明了孢粉素的极性、微孔性和结构在 Phen 吸附过程中的重要性。
