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    Kinetic and equilibrium studies on the biosorption of Cl reactive orange 16 dye by immobilized Scenedesmus quadricauda
    (Asian Journal Of Chemistry, 2008) Tan, Sema; Ergene, Aysun; Ada, Kezban; Katircioglu, Hikmet
    The biosorption of commonly used reactive dye, reactive orange 16 (RO 16). from aqueous solutions by live (ILSq) and heat inactivated Scenedesmus quadricauda (IHISq) immobilized Scenedesmus quadricauda was studied in a batch system with respect to pH, temperature and biosorption time. The ILSq and IHISq exhibited the highest dye uptake capacity at 30 degrees C, the initial pH value of 2.0 and the initial dye concentration of 300 mg L(-1). At 300 mg L(-1) initial dye concentration in the batch system the adsorption capacity was determined as 88.4 mg g(-1) of dye biosorption for IHISq in 0.5 h. The adsorption capacity of ILSq was observed as 71.2 mg g(-1) in 0.5 h and 76.4 mg g(-1) and 82.8 mg g(-1) of dye biosorption within I and 3 h, respectively. The equilibrium concentration and the adsorption capacity at equilibrium were determined using four different sorption models i.e., Langmuir, Temkin, Flory-Huggins and Freundlich isotherm.
  • Küçük Resim
    Öğe
    Removal of Remazol Brilliant Blue R dye from aqueous solutions by adsorption onto immobilized Scenedesmus quadricauda: Equilibrium and kinetic modeling studies
    (Elsevier Science Bv, 2009) Ergene, Aysun; Ada, Kezban; Tan, Sema; Katircioglu, Hikmet
    The green algae Scenedesnnus quadricauda was immobilized in alginate gel beads. The immobilized active (IASq) and heat inactivated S. quadricauda (IHISq) were used for the removal of Remazol Brilliant Blue R (Cl 61200, Reactive Blue 19, RBBR) from aqueous solutions in the concentration range 25-200 mg L(-1). At 150 mg L(-1) initial dye concentration the IASq and IHISq exhibited the highest dye uptake capacity at 30 degrees C, at the initial pH value of 2.0. At the same initial dye concentration in the batch system the adsorption capacity was determined for IASq as 44.2: 44.9 and 45.7 mg g(-1) in 30. 60 and 300 min, respectively. After 300 min the adsorption capacity hardly changed during the adsorption time. The IHISq of adsorption capacity was observed as 47.6; 47.8 and 48.3 mg g(-1) in 30, 60 and 300 min. respectively. After 300 min the adsorption capacity was not changed for 24 h. The Langmuir, Freundlich, Temkin, Dubinin-Radushkevich and Flory-Huggins isotherm models were used to fit the equilibrium biosorption data. The Langmuir, Freundlich and Dubinin-Radushkevich equations have better coefficients than Temkin and Flory-Huggins equation describing the RBBR dye adsorption onto IASq and IHISq. The monomolecular biosorption capacity of the biomass was found to be 68 and 95.2 mg g(-1) for IASq and IHISq, respectively. From the Dubinin-Radushkevich model. the mean free energy was calculated as 6.42-7.15 kJ mol(-1) for IASq and IHISq, indicating that the biosorption of dye was taken place in physical adsorption reactions. The experimental data were also tested in terms of kinetic characteristics and it was determined that the biosorption process of dye was well explained with pseudo-second-order kinetics. (C) 2009 Elsevier B.V. All rights reserved.