title: Role of structure, accessibility and microporosity on sorption of phenanthrene and nonylphenol by sediments and their fractions.
abstract: To better understand interaction mechanism of sediment organic matter with hydrophobic organic compounds, sorption of phenanthrene (Phen) and nonylphenol (NP) by bulk sediments and their fractions was investigated. Three surface sediments were selectively fractionated into different organic fractions, including the demineralized carbon (DM), lipid free carbon (LF), lipid (LP), and nonhydrolyzable carbon (NHC) fractions. The structure and microporosity of the isolated fractions were characterized by NMR and CO2adsorption techniques, and used as sorbents for Phen and NP. The calculated micropore volumes (Vo) and specific surface area (SSA) values are positively related to the concentrations of aromatic C and char for the DM, LF and NHC fractions, suggesting that aromatic moieties and char component significantly contribute to the microporosity. The LF fractions exhibit greater sorption affinity than the DM fractions do, indicating that the presence of LP could block the accessibility of sorption sites for Phen and NP. Significant and positive correlations among log K'FOCvalues for Phen and NP and aromatic carbon and char contents, and Voand SSA values suggest the aromatic moieties and microporosity dominate their sorption of HOCs by sediment organic matter (SOM). As the NHC fractions have much stronger sorption than other fractions do, they dominate the overall sorption by the bulk samples. This study indicated that the important roles of aromatic moieties, accessibility, and microporosity in the sorption of HOCs by SOM.
authors.affiliation: State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou, 510640, China.
authors.forename: Dainan
authors.initials: D
authors.lastname: Zhang
authors.affiliation: State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou, 510640, China.
authors.forename: Dandan
authors.initials: D
authors.lastname: Duan
authors.affiliation: 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.
authors.forename: Youda
authors.initials: Y
authors.lastname: Huang
authors.affiliation: State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou, 510640, China.
authors.forename: Yongqiang
authors.initials: Y
authors.lastname: Xiong
authors.affiliation: State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou, 510640, China.
authors.forename: Yu
authors.initials: Y
authors.lastname: Yang
authors.affiliation: State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou, 510640, China. Electronic address: yran@gig.ac.cn.
authors.forename: Yong
authors.initials: Y
authors.lastname: Ran
mesh_terms: D000327:Adsorption; D002244:Carbon / Q000737:chemistry*; D002681:China; D052918:Environmental Restoration and Remediation; D019015:Geologic Sediments / Q000737:chemistry*; D057927:Hydrophobic and Hydrophilic Interactions; D009682:Magnetic Resonance Spectroscopy; D008962:Models, Theoretical; D010616:Phenanthrenes / Q000032:analysis* / Q000737:chemistry; D010636:Phenols / Q000032:analysis* / Q000737:chemistry; D016062:Porosity; D045483:Rivers / Q000737:chemistry*; D013499:Surface Properties; D014874:Water Pollutants, Chemical / Q000032:analysis* / Q000737:chemistry
chemical_list: D010616:Phenanthrenes; D010636:Phenols; D014874:Water Pollutants, Chemical; C031181:phenanthrene; D002244:Carbon; C025256:nonylphenol
keywords: Aromatic carbon; Microporosity; Nonylphenol (NP); Phenanthrene (Phen); Sorption