title: Mechanistic understanding of tetracycline sorption on waste tire powder and its chars as affected by Cu(2+) and pH.
abstract: The sorption characteristics of tetracycline (TC) by waste tire powder and its chars were investigated to explore the potential of using waste tires as effective sorbents for removal of TC from aqueous solution. Naphthalene (NAPH), a typical hydrophobic organic compound, was selected as asorbate for comparison. TC displayed much lower sorption affinity to tire powder than NAPH. However, it exhibited similar adsorption affinity as NAPH on the pyrolyzed tire chars, which was mainly attributed to π-π electron-donor-acceptor interactions of TC with the graphite surface of chars. TC and Cu(2+) could mutually facilitate the sorption of each other on both tire powder and pyrolyzed chars in a wide pH range. This could be explained by the metallic complexation and/or surface-bridging mechanisms (i.e., Cu- or TC-bridging). However, Cu(2+) and NAPH depressed the sorption of each other on tire powder and displayed negligible impact to each other on the highly pyrolyzed chars.
authors.affiliation: Centre for Research in Ecotoxicology and Environmental Remediation, Institute of Agro-Environmental Protection, Ministry of Agriculture, Fukang Road 31, Nankai District, Tianjin 300191, China. lianfei2000@gmail.com
authors.forename: Fei
authors.initials: F
authors.lastname: Lian
authors.forename: Zhengguo
authors.initials: Z
authors.lastname: Song
authors.forename: Zhongqi
authors.initials: Z
authors.lastname: Liu
authors.forename: Lingyan
authors.initials: L
authors.lastname: Zhu
authors.forename: Baoshan
authors.initials: B
authors.lastname: Xing
mesh_terms: D000327:Adsorption; D001336:Automobiles; D002413:Cations, Divalent / Q000737:chemistry; D003300:Copper / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D008956:Models, Chemical; D009281:Naphthalenes / Q000737:chemistry; D013752:Tetracycline / Q000032:analysis / Q000737:chemistry*; D014865:Waste Disposal, Fluid / Q000379:methods*; D014866:Waste Products / Q000032:analysis
chemical_list: D002413:Cations, Divalent; D009281:Naphthalenes; D014866:Waste Products; C031721:naphthalene; D003300:Copper; D013752:Tetracycline