title: Removal of methylene blue by invasive marine seaweed: Caulerpa racemosa var. cylindracea.
abstract: Caulerpa racemosa var. cylindracea is one of the well-known invasive species in the Mediterranean Sea. In the present study, dried biomass of C. racemosa var. cylindracea was shown to have adsorption capacity for methylene blue. The adsorption reached equilibrium at 90 min for all studied concentrations (5-100mg/L). The pseudo-second-order model is well in line with our experimental results. There was a sharp increase in the adsorbed dye amount per adsorbent amount from 3.3 to 16.7 g/L, then a slight increase up to 66.7 g/L was observed. Langmuir and Freundlich's models were applied to the data related to adsorption isotherm. According to Langmuir's model data, the observed maximum adsorption capacity (qm) was 5.23 mg/g at 18 degrees C. The enthalpy of adsorption was found to be 33 kJ/mol, which indicated a chemical adsorption between dye molecules and C. racemosa var. cylindracea functional groups.
authors.affiliation: Dokuz Eylul University, Faculty of Arts and Sciences, Department of Chemistry, Biochemistry Division, Tinaztepe Campus, Izmir, Turkey.
authors.forename: Sevilay
authors.initials: S
authors.lastname: Cengiz
authors.forename: Levent
authors.initials: L
authors.lastname: Cavas
mesh_terms: D000327:Adsorption; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D008386:Marine Biology; D008751:Methylene Blue / Q000302:isolation & purification*; D012624:Seaweed / Q000378:metabolism*; D013816:Thermodynamics
chemical_list: D008751:Methylene Blue