title: Biosorption removal of benzene and toluene by three dried macroalgae at different ionic strength and temperatures: Algae biochemical composition and kinetics.
abstract: Release of low-molecular aromatic hydrocarbons (HC) into natural waters brings severe consequences to our environment. Unfortunately very limited information is available regarding the treatment of these pollutants. This work evaluated the use of brown, green and red macroalgae biomass as biosorbents of benzene and toluene, two of the most soluble HC. Raw seaweed biomasses were completely characterized, then evaluated under different temperatures and ionic strengths to assess their potential as biosorbents and to elucidate the biosorption mechanisms involved. Brown macroalgae registered the highest removal capacities for benzene and toluene (112 and 28 mg·g-1, respectively), and these were not affected at ionic strength < 0.6 M. Langmuir and Sips isotherm equations well described biosorption data, and the pseudo-second order model provided the best fit to the kinetics rate. Hydrocarbons are adsorbed onto the diverse chemical components of the cell wall by London forces and hydrophobic interactions.
authors.affiliation: División de Ciencias Ambientales, Instituto Potosino de Investigación Científica y Tecnológica A.C., Camino a la Presa San José 2055, Col. Lomas 4a sección, C.P. 78216, San Luis Potosí, SLP, Mexico.
authors.forename: Carlos E
authors.initials: CE
authors.lastname: Flores-Chaparro
authors.affiliation: División de Ciencias Ambientales, Instituto Potosino de Investigación Científica y Tecnológica A.C., Camino a la Presa San José 2055, Col. Lomas 4a sección, C.P. 78216, San Luis Potosí, SLP, Mexico.
authors.forename: Luis Felipe
authors.initials: LF
authors.lastname: Chazaro Ruiz
authors.affiliation: Universidad Autónoma de San Luis Potosí, Álvaro Obregón 64, Centro Histórico, C.P. 78000, San Luis Potosí, SLP, Mexico.
authors.forename: Ma Catalina
authors.initials: MC
authors.lastname: Alfaro de la Torre
authors.affiliation: Universidad Autónoma de Baja California, Campus Ensenada, Km. 103, Carretera Tijuana-Ensenada, Ensenada, Baja California, Mexico.
authors.forename: Miguel Angel
authors.initials: MA
authors.lastname: Huerta-Diaz
authors.affiliation: División de Ciencias Ambientales, Instituto Potosino de Investigación Científica y Tecnológica A.C., Camino a la Presa San José 2055, Col. Lomas 4a sección, C.P. 78216, San Luis Potosí, SLP, Mexico. Electronic address: rene@ipicyt.edu.mx.
authors.forename: Jose Rene
authors.initials: JR
authors.lastname: Rangel-Mendez
mesh_terms: D000327:Adsorption; D001554:Benzene; D018533:Biomass; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D009994:Osmolar Concentration; D012624:Seaweed / Q000737:chemistry*; D013696:Temperature; D014050:Toluene; D014874:Water Pollutants, Chemical / Q000737:chemistry
chemical_list: D014874:Water Pollutants, Chemical; D014050:Toluene; D001554:Benzene
keywords: Biosorption; Ionic strength; Macroalgae; Soluble-hydrocarbons