title: Sorption of apolar and polar organic contaminants by waste tire rubber and its chars in single- and bi-solute systems.
abstract: Single- and bi-solute sorption of organic compounds [1,3-dichlorbenzene (DCB), 1,3-dinitrobenzene (DNB) and 2,4-dichlorophenol (DCP)] on ground tire rubber and its chars was studied. The chars were prepared by pyrolyzing tire rubber at different temperatures (200-800 °C). Their surface area, aromaticity and hydrophobicity increase greatly with pyrolytic temperature, and the polymeric phase is partly converted into a condensed phase. The sorption of DNB and DCP increases with pyrolytic temperature and is characterized by a transition from a partition dominant to an adsorption dominant process. However, the sorption of DCB linearly decreases with the pyrolytic temperature. The enhanced adsorption of DNB and DCP on carbonized phase is primarily attributed to nonhydrophobic interactions such as π-π electron-donor-acceptor interactions and/or H bonding. The higher partition of DCB to polymeric phase is attributed to its high hydrophobicity. Competitive sorption between DCB and DCP on the tire chars is highly dependent on dissociation of the latter.
authors.affiliation: College of Environmental Science and Engineering, Tianjin Key Laboratory of Environmental Remediation and Pollution Control, Key Laboratory of Pollution Processes and Environmental Criteria, Ministry of Education, Nankai University, Tianjin 300071, PR China.
authors.forename: Fei
authors.initials: F
authors.lastname: Lian
authors.forename: Fang
authors.initials: F
authors.lastname: Huang
authors.forename: Wei
authors.initials: W
authors.lastname: Chen
authors.forename: Baoshan
authors.initials: B
authors.lastname: Xing
authors.forename: Lingyan
authors.initials: L
authors.lastname: Zhu
mesh_terms: D000327:Adsorption; D002606:Charcoal / Q000737:chemistry; D002722:Chlorobenzenes / Q000737:chemistry; D002733:Chlorophenols / Q000737:chemistry; D004136:Dinitrobenzenes / Q000737:chemistry; D004785:Environmental Pollutants / Q000737:chemistry*; D017745:Incineration; D052638:Particulate Matter / Q000737:chemistry; D012037:Refuse Disposal / Q000379:methods*; D012408:Rubber / Q000737:chemistry*; D013696:Temperature
chemical_list: D002722:Chlorobenzenes; D002733:Chlorophenols; D004136:Dinitrobenzenes; D004785:Environmental Pollutants; D052638:Particulate Matter; D002606:Charcoal; C042146:1,3-dichlorobenzene; D012408:Rubber; C017906:3-dinitrobenzene; C004762:2,4-dichlorophenol