Removal of basic dye using raw and acid activated bentonite samples

Eren E., Afsin B.

JOURNAL OF HAZARDOUS MATERIALS, vol.166, no.2-3, pp.830-835, 2009 (SCI-Expanded, Scopus) identifier identifier identifier

  • Publication Type: Article / Article
  • Volume: 166 Issue: 2-3
  • Publication Date: 2009
  • Doi Number: 10.1016/j.jhazmat.2008.11.132
  • Journal Name: JOURNAL OF HAZARDOUS MATERIALS
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.830-835
  • Keywords: Dye adsorption, Activation thermodynamic, Kinetic, Acid activation, X-ray diffraction, AQUEOUS-SOLUTION, ADSORPTION, MODEL, THERMODYNAMICS, KINETICS, SORPTION, CATIONS, CLAYS, WATER
  • Ondokuz Mayıs University Affiliated: Yes

Abstract

The adsorption behavior of crystal violet (CV+) from aqueous solution onto raw (RB) and acid activated (AAB) bentonite samples was investigated as a function of parameters such as initial CV+ concentration, contact time and temperature. The Langmuir and Freundlich adsorption models were applied to describe the equilibrium isotherms. The adsorption rate was fast and more than half of the adsorbed-CV+ was removed in the first 55 min for RB and 25 min for 0.2-AAB at the room temperature (C-0 = 1.2 mmol/g). The pseudo-first order, and pseudo-second order kinetic models were used to describe the kinetic data and rate constants were evaluated. The results best fit the pseudo-second order kinetic model with the rate constant, k(2), in the range of 13.52 x 10(-2) to 5.53 x 10(-2) g/mmol and 52.70 x 10(-2) to 6.69 x 10(-2) mmol/g min for RB and 0.2-AAB sample, respectively (C-0 = 0.1-1.2 mmol/g). (C) 2008 Elsevier B.V. All rights reserved.