title: Sorption of phenanthrene and benzene on differently structural kerogen: important role of micropore-filling.
abstract: Shale was thermally treated to obtain a series of kerogen with varied maturation. Their chemical, structural and porous properties were related to the sorption and/or desorption behaviors of phenanthrene and benzene. As the treatment temperature increases, aliphatic and carbonyl carbon of the kerogen samples decrease, while their aromaticity and maturation increase. Meanwhile, the isothermal nonlinearity of phenanthrene and benzene increases whereas the sorption capacity and micropore adsorption volumes (Vo,d) initially increase and then decrease. The Vo,d of benzene is significantly correlated with, but higher than that of phenanthrene, suggesting similar micropore filling mechanism and molecular sieve effect. The benzene desorption exhibits hysteresis, which is related to the pore deformation of the kerogen and the entrapment of solute in the kerogen matrix. The Vo,d of phenanthrene and benzene on the kerogen samples accounts for 23-46% and 36-65% of the maximum sorption volumes, respectively, displaying the importance of the micropore filling.
authors.affiliation: State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, 511 Kehuajie, Tianhe District, Guangzhou 510640, China.
authors.forename: Yulong
authors.initials: Y
authors.lastname: Zhang
authors.affiliation: State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, 511 Kehuajie, Tianhe District, Guangzhou 510640, China; School of Resources and Environment Engineering, Shandong University of Technology, Zibo 255049, China.
authors.forename: Xiaoxuan
authors.initials: X
authors.lastname: Ma
authors.affiliation: State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, 511 Kehuajie, Tianhe District, Guangzhou 510640, China. Electronic address: yran@gig.ac.cn.
authors.forename: Yong
authors.initials: Y
authors.lastname: Ran
mesh_terms: D000327:Adsorption; D001554:Benzene / Q000737:chemistry*; D002244:Carbon / Q000737:chemistry*; D004785:Environmental Pollutants / Q000737:chemistry; D019015:Geologic Sediments / Q000737:chemistry; D008956:Models, Chemical; D010616:Phenanthrenes / Q000737:chemistry*; D016062:Porosity
chemical_list: D004785:Environmental Pollutants; D010616:Phenanthrenes; C031181:phenanthrene; D002244:Carbon; D001554:Benzene
keywords: Benzene; Hole-filling; Kerogen; Phenanthrene; Sorption