A new statistical physics model to interpret the binary adsorption isotherms of lead and zinc on activated carbon
Küçük Resim Yok
Tarih
2016
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Elsevier Science Bv
Erişim Hakkı
info:eu-repo/semantics/closedAccess
Özet
New statistical physicochemical interpretations of an adsorption process at molecular level were developed to explain the binary adsorption isotherms of lead and zinc ions on activated carbon derived from Styrax officinalis seeds (Balikesir, Turkey) and a commercial activated carbon at different temperatures, 298, 308 and 318 K. The extended Hill model was developed to explain heterogeneous model in terms of the grand canonical ensemble in statistical physics. Steric and energetic parameters, like the numbers of ions per site n(1) and n(2), the densities of receptor sites N-M1 and N-M2 and the adsorption energies (-epsilon(1)) and (-epsilon(2)) were directly obtained from the fitting of the experimental adsorption isotherms by numerical simulation to describe the process. The simulation results suggested that two adsorbates per site were anchored on activated carbon surface. The magnitudes of the calculated adsorption energies indicated that Zn2+ and Pb2+ were physically adsorbed by the activated carbon. Thermodynamic potential functions, namely entropy, enthalpy and internal energy were calculated to explain the order and disorder of the adsorbate at the adsorbent surface during the binary adsorption process. The values of the free enthalpy and the internal energy indicated spontaneous adsorption process. (C) 2015 Elsevier B.V. All rights reserved.
Açıklama
Anahtar Kelimeler
Binary adsorption, New statistical physics model, Activated carbon, Lead and zinc, Thermodynamic potential functions
Kaynak
Journal of Molecular Liquids
WoS Q Değeri
Q1
Scopus Q Değeri
Q1
Cilt
214
