Author/Authors :
Yazida, H Laboratoire de Chimie Analytique et Moléculaire - Faculté Poly-disciplinaire - Université Cadi Ayyad - Safi, Maroc , Achour, Y Laboratoire de Chimie Analytique et Moléculaire - Faculté Poly-disciplinaire - Université Cadi Ayyad - Safi, Maroc , El Kassimi, A Laboratoire de Chimie Analytique et Moléculaire - Faculté Poly-disciplinaire - Université Cadi Ayyad - Safi, Maroc , Nadir, I Laboratoire de Chimie Analytique et Moléculaire - Faculté Poly-disciplinaire - Université Cadi Ayyad - Safi, Maroc , El Himri, M Laboratoire de Chimie Analytique et Moléculaire - Faculté Poly-disciplinaire - Université Cadi Ayyad - Safi, Maroc , Laamari, M.R Laboratoire de Chimie Analytique et Moléculaire - Faculté Poly-disciplinaire - Université Cadi Ayyad - Safi, Maroc , El Haddad, M Laboratoire de Chimie Analytique et Moléculaire - Faculté Poly-disciplinaire - Université Cadi Ayyad - Safi, Maroc
Abstract :
Adsorption experiments were carried out as a part of the removal of Congo red (CR), a textile dye, from aqueous solutions using the
powder of cuttlefish bone (Sepia) as a new potential adsorbent. The prepared powder was characterized by FTIR, XRD, SEM and
elemental analysis. The effects of solution pH, adsorbent amount, CR concentration, temperature and contact time on the CR adsorption
were investigated. The experimental results showed that maximum pH was about 2 for efficient uptake of CR. The equilibrium was
attained in 60 min. The adsorption of Congo red was found to be exothermic in nature (ΔH° = 8.41 kJ mol-1), while the positive value of
entropy 20.85 J mol-1 K-1 indicated an increased randomness at the solid/liquid interface. The experimental data were analyzed using
Langmuir and Freundlich isothermal models. The best fit was obtained by Langmuir model with a maximum monolayer adsorption
capacity of 69.9 mg g-1. Adsorption kinetics data were properly fitted with the pseudo second-order kinetic model.
Keywords :
Isotherms , Kinetic , Removal dye , Congo red , Cuttlefish bone
