Determination of the equilibrium, kinetic and thermodynamic parameters of adsorption of copper(II) ions onto seeds of Capsicum annuum

Ozcan A., Ozcan A., Tunali S., Akar T., KIRAN İ.

JOURNAL OF HAZARDOUS MATERIALS, cilt.124, sa.1-3, ss.200-208, 2005 (SCI-Expanded) identifier identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 124 Sayı: 1-3
  • Basım Tarihi: 2005
  • Doi Numarası: 10.1016/j.jhazmat.2005.05.007
  • Dergi Adı: JOURNAL OF HAZARDOUS MATERIALS
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.200-208
  • Anahtar Kelimeler: adsorption, copper, isotherm, kinetics, thermodynamics, AQUEOUS-SOLUTIONS, HEAVY-METALS, BY-PRODUCTS, REMOVAL, BIOSORPTION, SORPTION, WATER, LEAD, DYE, ADSORBENTS
  • Anadolu Üniversitesi Adresli: Hayır

Özet

Adsorption of copper ions onto Capsicum annuum (red pepper) seeds was investigated with the variation in the parameters of pH, contact time, adsorbent and copper(II) concentrations and temperature. The nature of the possible adsorbent and metal ion interactions was examined by the FTIR technique. The copper(II) adsorption equilibrium was attained within 60 min. Adsorption of copper(II) ions onto C annuum seeds followed by the Langmuir, Freundlich and Dubinin-Radushkevich (D-R) isotherm models. Maximum adsorption capacity (q(max)) of copper(II) ions onto red pepper seeds was 4.47 x 10(-4) Mol g(-1) at 50 degrees C. Three kinetic models including the pseudo-first-order, pseudo-second-order and intraparticle diffusion equations were selected to follow the adsorption process. Kinetic parameters such as rate constants, equilibrium adsorption capacities and related correlation coefficients, for each kinetic model were calculated and discussed. It was indicated that the adsorption of copper(II) ions onto C annuum seeds could be described by the pseudo-second-order kinetic model and also followed the intraparticle diffusion model up to 60 min, but diffusion is not only the rate controlling step. Thermodynamics parameters such as the change of free energy, enthalpy and entropy were also evaluated for the adsorption of copper(H) ions onto C. annuum seeds. (c) 2005 Elsevier B.V. All rights reserved.