title: Characterization of nitrogen-rich biomaterial-derived biochars and their sorption for aromatic compounds.
abstract: Biochars from nitrogen-rich biomaterials (i.e., α-amylase, chitin and zein) were produced at different temperatures (i.e. 170, 250, 350 and 450 °C) and characterized, and their sorption for phenanthrene, naphthalene and 1-naphthol was investigated. The organic carbon content normalized-sorption coefficient (Koc) of the tested compounds by biochars increased with increasing charring temperature, attributed to the reduction of O-containing polar moieties especially the O-alkyl components, and the newly created aromatic carbon domains. The N-heterocyclic ring structure formed during charring process may enhance π-π interactions between aromatics and the aromatic components in the resulting biochars. However, π-π interactions did not dominate sorption of aromatics by N-rich biochars. Sorption of the tested compounds by N-rich biochars was predominantly controlled by the hydrophobic interactions between these chemicals and the aromatic components in biochars. Both N- and O-containing polar moieties at the biochar surfaces negatively affected their sorption for aromatics.
authors.affiliation: Laboratory for Earth Surface Processes, College of Urban and Environmental Sciences, Peking University, Beijing 100871, China.
authors.forename: Meng
authors.initials: M
authors.lastname: Zhang
authors.affiliation: Laboratory for Earth Surface Processes, College of Urban and Environmental Sciences, Peking University, Beijing 100871, China.
authors.forename: Liang
authors.initials: L
authors.lastname: Shu
authors.affiliation: Laboratory for Earth Surface Processes, College of Urban and Environmental Sciences, Peking University, Beijing 100871, China.
authors.forename: Xiaofang
authors.initials: X
authors.lastname: Shen
authors.affiliation: Laboratory for Earth Surface Processes, College of Urban and Environmental Sciences, Peking University, Beijing 100871, China.
authors.forename: Xiaoying
authors.initials: X
authors.lastname: Guo
authors.affiliation: Laboratory for Earth Surface Processes, College of Urban and Environmental Sciences, Peking University, Beijing 100871, China.
authors.forename: Shu
authors.initials: S
authors.lastname: Tao
authors.affiliation: Stockbridge School of Agriculture, University of Massachusetts, Amherst, MA 01003, USA.
authors.forename: Baoshan
authors.initials: B
authors.lastname: Xing
authors.affiliation: Laboratory for Earth Surface Processes, College of Urban and Environmental Sciences, Peking University, Beijing 100871, China. Electronic address: xilong@pku.edu.cn.
authors.forename: Xilong
authors.initials: X
authors.lastname: Wang
mesh_terms: D000327:Adsorption; D002244:Carbon / Q000737:chemistry; D002606:Charcoal / Q000737:chemistry*; D008956:Models, Chemical; D009281:Naphthalenes / Q000737:chemistry; D009284:Naphthols / Q000737:chemistry; D009584:Nitrogen / Q000737:chemistry*; D009930:Organic Chemicals / Q000737:chemistry*; D010616:Phenanthrenes / Q000737:chemistry; D011084:Polycyclic Aromatic Hydrocarbons / Q000737:chemistry
chemical_list: D009281:Naphthalenes; D009284:Naphthols; D009930:Organic Chemicals; D010616:Phenanthrenes; D011084:Polycyclic Aromatic Hydrocarbons; C540010:biochar; D002606:Charcoal; C031721:naphthalene; C029350:1-naphthol; C031181:phenanthrene; D002244:Carbon; D009584:Nitrogen
keywords: Aromatic compound; Interaction mechanism; N-rich biochar; Sorption