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; Guangdong Provincial Key Laboratory of Environmental Protection and Resources Utilization, Guangzhou, 510640, China.
State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou, 510640, China.
Environ Pollut. 2020 May;260:114034. doi: 10.1016/j.envpol.2020.114034. Epub 2020 Jan 24.
The demineralized fraction (DM), lipid-free fraction (LF), nonhydrolyzable organic carbon fraction (NHC), and black carbon (BC) were isolated from five marine surface sediments, and they were characterized by elemental analysis as well as CO and N adsorption techniques, respectively. The NHC fractions were characterized using advanced solid-state C nuclear magnetic resonance (NMR) and x-ray photoelectron spectroscopy (XPS). Then, the sorption isotherms of phenanthrene (Phen) and nonylphenol (NP) on all of the samples were investigated by a batch technique. The CO micropore volumes were corrected for the outer specific surface areas (SSAs) by using the N-SSA. Significant correlations between the micropore-filling volumes of Phen and NP and the micropore volumes suggested that the micropore-filling mechanism dominated the Phen and NP sorption. Meanwhile, the (O + N)/C atomic ratios were negatively and significantly correlated with the sorption capacities of Phen and NP, indicating that the sedimentary organic matter (SOM) polarity also played a significant role in the sorption process. In addition, a strong linear correlation was demonstrated between the aromatic C and the sorption capacity of Phen for the NHC fractions. This study demonstrates the importance of the micropores, polarity, and aromaticity on the sorption processes of Phen and NP in the sediments.
从五个海洋表层沉积物中分离出脱矿质部分（DM）、无脂质部分（LF）、不可水解有机碳部分（NHC）和黑碳（BC），并分别通过元素分析以及 CO 和 N 吸附技术对它们进行了表征。使用高级固态 C 核磁共振（NMR）和 X 射线光电子能谱（XPS）对 NHC 部分进行了表征。然后，通过分批技术研究了所有样品对菲（Phen）和壬基酚（NP）的吸附等温线。通过 N-SSA 对 CO 微孔体积进行了对外比表面积（SSAs）的修正。Phen 和 NP 的微孔填充体积与微孔体积之间存在显著相关性，表明微孔填充机制主导了 Phen 和 NP 的吸附。同时，（O+N）/C 原子比与 Phen 和 NP 的吸附容量呈显著负相关，表明沉积物有机质（SOM）的极性在吸附过程中也起着重要作用。此外，NHC 部分的芳香族 C 与 Phen 的吸附容量之间表现出很强的线性相关性。本研究表明，在沉积物中 Phen 和 NP 的吸附过程中，微孔、极性和芳香性非常重要。
