skip to main content
Idioma:

Silica gel modified with ethylenediamine and succinic acid-adsorption and calorimetry of cations in aqueous solution

Arakaki, L.N.H. ; Filha, V.L.S. Augusto ; Germano, A.F.S. ; Santos, S.S.G. ; Fonseca, M.G. ; Sousa, K.S. ; Espínola, J.G.P. ; Arakaki, T.

Thermochimica acta, 2013-03, Vol.556, p.34-40 [Periódico revisado por pares]

Elsevier B.V

Texto completo disponível

Citações Citado por
  • Título:
    Silica gel modified with ethylenediamine and succinic acid-adsorption and calorimetry of cations in aqueous solution
  • Autor: Arakaki, L.N.H. ; Filha, V.L.S. Augusto ; Germano, A.F.S. ; Santos, S.S.G. ; Fonseca, M.G. ; Sousa, K.S. ; Espínola, J.G.P. ; Arakaki, T.
  • Assuntos: Adsorption ; ambient temperature ; Aqueous solutions ; Calorimetry ; Cations ; cobalt ; Copper ; enthalpy ; Gibbs free energy ; heat production ; Immobilization ; Mathematical analysis ; Nickel ; Silica gel ; sorption isotherms ; Succinic acid ; Surface chemistry ; titration
  • É parte de: Thermochimica acta, 2013-03, Vol.556, p.34-40
  • Notas: http://dx.doi.org/10.1016/j.tca.2013.01.024
    ObjectType-Article-2
    SourceType-Scholarly Journals-1
    ObjectType-Feature-1
    content type line 23
    ObjectType-Article-1
    ObjectType-Feature-2
  • Descrição: ► Succinic acid-modified silica acted as an adsorbent for Cu (II), Ni (II), and Co (II) from aqueous solutions. ► Modified silica adsorbed metallic cations in the order Cu2+>Co2+>Ni2+. ► Succinic acid-modified silica could be employed as low-cost material for the removal of cations from aqueous solution. ► Thermodynamic data for these systems are favorable at the solid/liquid interface. Ethylenediamine molecules were covalently immobilized onto silica gel previously functionalized with 3-chlorosilylpropyltrimethoxysilane (Sil–Cl), producing a Sil–N surface. The Sil–N surface reacted with succinic acid, yielding a Sil–NSuc surface. This new synthesized silica gel surface was used to adsorb divalent cations from aqueous solutions at room temperature. The adsorption isotherms were fit to a modified Langmuir equation using the data obtained by suspending the solid in MCl2 (M=Cu, Ni, and Co) aqueous solutions, yielding the maximum number of moles adsorbed as 1.04±0.01, 1.89±0.02 and 1.85±0.02mmolg−1 for divalent copper, nickel and cobalt, respectively. The metal-basic center ratio for complexes on the surfaces varied with the nature of the metal. The spontaneity of these systems was reflected in the negative values of the Gibbs free energy calculated using calorimetric data. The net thermal effects obtained from the calorimetric titration measurements were adjusted to a modified Langmuir equation, and the calculation of the enthalpies of the interaction for the complexation with Sil–NSuc yielded the following exothermic values: 2.81±0.08, 0.35±0.04±and 0.69±0.05kJmol−1 for Cu2+, Co2+ and Ni2+, respectively. Based on these values, the metals are preferentially adsorbed in the order Cu2+>Co2+>Ni2+. The other thermodynamic data for these systems are favorable at the solid/liquid interface, suggesting the efficacy of this modified silica for cation removal from solution.
  • Editor: Elsevier B.V
  • Idioma: Inglês;Holandês
Voltar para lista de resultados
Resultado  1 AvançarIr para próxima página

  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

Buscando em bases de dados remotas. Favor aguardar.