title: Sorption study of toluene and xylene in aqueous solutions by recycled tires crumb rubber.
abstract: Sorption of toluene and xylene by tire crumb rubber (TCR) and its main components: carbon black (CB) and styrene-butadiene polymer (SBP) were evaluated. The 12 starting concentrations of adsorbates in aqueous solutions ranged from 0.05 mg/L to 100.0mg/L. The amounts of CB and SBP used in the sorption tests were determined considering their typical contents in tire crumb rubber (30% and 60% w/w, respectively). Freundlich's isotherms and Scatchard plot parameters suggested a two-step sorption process when TCR was used as the sorbent; whereas a single-step route was apparent when the sorption experiments were carried out with CB or SBP. Freundlich's n parameter was estimated at 0.65 for CB and 1.0 for both TCR and SBP. A removal of 60% of toluene and 81% of xylene from starting 50 ppm solutions was attained in the first 30 minutes of contact using 5 g/L of TCR.
authors.affiliation: Department of Chemistry, University of Puerto Rico, Mayagüez, Puerto Rico.
authors.forename: Luis A
authors.initials: LA
authors.lastname: Alamo-Nole
authors.forename: Oscar
authors.initials: O
authors.lastname: Perales-Perez
authors.forename: Felix R
authors.initials: FR
authors.lastname: Roman-Velazquez
mesh_terms: D000327:Adsorption; D000465:Algorithms; D002070:Butadienes / Q000737:chemistry; D017743:Equipment Reuse; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D008855:Microscopy, Electron, Scanning; D010316:Particle Size; D012408:Rubber / Q000737:chemistry*; D012996:Solutions; D020058:Styrene / Q000737:chemistry; D013816:Thermodynamics; D014050:Toluene / Q000737:chemistry*; D014867:Water; D014992:Xylenes / Q000737:chemistry*
chemical_list: D002070:Butadienes; D012996:Solutions; D014992:Xylenes; D014867:Water; D014050:Toluene; D020058:Styrene; D012408:Rubber