Removal of phenol from aqueous solutions by adsorption onto organomodified Tirebolu bentonite: Equilibrium, kinetic and thermodynamic study

ŞENTÜRK H. B., ÖZDEŞ D., gündoğdu a., DURAN C., SOYLAK M.

JOURNAL OF HAZARDOUS MATERIALS, cilt.172, sa.1, ss.353-362, 2009 (SCI-Expanded) identifier identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 172 Sayı: 1
  • Basım Tarihi: 2009
  • Doi Numarası: 10.1016/j.jhazmat.2009.07.019
  • Dergi Adı: JOURNAL OF HAZARDOUS MATERIALS
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.353-362
  • Anahtar Kelimeler: Removal, Phenol, Adsorption, Organobentonite, Cetyl trimethylammonium bromide, Spectrophotometric determination, ACTIVATED CARBON, WASTE-WATER, PB(II), MONTMORILLONITE, SORPTION, IONS, KAOLINITE, RECOVERY, NI(II), CU(II)
  • Erciyes Üniversitesi Adresli: Evet

Özet

A natural bentonite modified with a cationic surfactant, cetyl trimethylammonium bromide (CTAB), was used as an adsorbent for removal of phenol from aqueous solutions. The natural and modified bentonites (organobentonite) were characterized with some instrumental techniques (FTIR, XRD and SEM). Adsorption studies were performed in a batch system, and the effects of various experimental parameters such as solution pH, contact time, initial phenol concentration, organobentonite concentration, and temperature, etc. were evaluated upon the phenol adsorption onto organobentonite. Maximum phenol removal was observed at pH 9.0. Equilibrium was attained after contact of 1 h only. The adsorption isotherms were described by Langmuir and Freundlich isotherm models, and both model fitted well. The monolayer adsorption capacity of organobentonite was found to be 333 mg g(-1). Desorption of phenol from the loaded adsorbent was achieved by using 20% acetone solution. The kinetic studies indicated that the adsorption process was best described by the pseudosecond-order kinetics (R-2 > 0.99). Thermodynamic parameters including the Gibbs free energy (Delta G degrees), enthalpy (Delta H degrees), and entropy (Delta S degrees) were also calculated. These parameters indicated that adsorption of phenol onto organobentonite was feasible, spontaneous and exothermic in the temperature range of 0-40 degrees C. (C) 2009 Elsevier B.V. All rights reserved.