Adsorption of Zinc(II) on diatomite and manganese-oxide-modified diatomite: A kinetic and equilibrium study

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Caliskan N., Kul A. R., Alkan S., Sogut E. G., Alacabey I.

JOURNAL OF HAZARDOUS MATERIALS, cilt.193, ss.27-36, 2011 (SCI-Expanded) identifier identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 193
  • Basım Tarihi: 2011
  • Doi Numarası: 10.1016/j.jhazmat.2011.06.058
  • Dergi Adı: JOURNAL OF HAZARDOUS MATERIALS
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.27-36
  • Anahtar Kelimeler: Diatomite, Adsorption, Zinc, Manganese oxides, Kinetic, AQUEOUS-SOLUTION, NATURAL DIATOMITE, SURFACE-CHEMISTRY, METHYLENE-BLUE, HEAVY-METALS, REMOVAL, SORPTION, IONS, KAOLINITE, ZN(II)
  • Van Yüzüncü Yıl Üniversitesi Adresli: Evet

Özet

The removal of Zn(II) ions from aqueous solution was studied using natural and MnO2 modified diatomite samples at different temperatures. The linear Langmuir, Freundlich and Dubinin-Radushkevich (D-R) adsorption equations were applied to describe the equilibrium isotherms. From the D-R model, the mean adsorption energy was calculated as >8 kJ mol(-1), indicating that the adsorption of Zn(II) onto diatomite and Mn-diatomite was physically carried out. In addition, the pseudo-first-order, pseudo-second-order and intraparticle diffusion models were used to determine the kinetic data. The experimental data were well fitted by the pseudo-second-order kinetic model. Thermodynamic parameters such as the enthalpy (Delta H-0), Gibbs' free energy (Delta G(0)) and entropy (Delta S-0) were calculated for natural and MnO2 modified diatomite. These values showed that the adsorption of Zn(II) ions onto diatomite samples was controlled by a physical mechanism and occurred spontaneously. (C) 2011 Elsevier B.V. All rights reserved.