Investigation of a basic dye adsorption from aqueous solution onto raw and pre-treated bentonite surfaces

Eren E., Afsin B.

DYES AND PIGMENTS, cilt.76, sa.1, ss.220-225, 2008 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 76 Sayı: 1
  • Basım Tarihi: 2008
  • Doi Numarası: 10.1016/j.dyepig.2006.08.019
  • Dergi Adı: DYES AND PIGMENTS
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.220-225
  • Anahtar Kelimeler: metal-saturated bentonite, adsorption thermodynamics, charge reversal, crystal violet, ionic strength, METHYLENE-BLUE, CLAY-MINERALS, CRYSTAL VIOLET, COMPETITIVE ADSORPTION, EXCHANGEABLE CATIONS, ORGANIC CATIONS, PORE STRUCTURE, METAL-IONS, MONTMORILLONITE, SORPTION
  • Ondokuz Mayıs Üniversitesi Adresli: Evet

Özet

The effects of temperature, pH and ionic strength on the adsorption of crystal violet (CV+) by raw, Ni-saturated (Ni-), Co-saturated (Co-) and Zn-saturated (Zn-) bentonite samples were investigated. The amounts of CV+ adsorbed in equilibrium at 298.15 K were 0.27, 0.37, 0.49 and 0.54 mmol g(-1) bentonite, which correspond to 108%, 148%, 196% and 216% of the cation exchange capacity (CEC) of the raw, Ni-, Zn- and Co-saturated bentonite samples, respectively. The adsorption of the dye on these samples is pH-independent within the range (2.5-8.5), and it increases with ionic strength from 0 to 0.6 mol l(-1). Thermodynamic and Langmuir parameters showed that cation -saturated bentonite samples have relatively stronger ability than the raw bentonite towards the crystal violet (CV+) cation. (C) 2006 Elsevier Ltd. All rights reserved.