Equilibrium, kinetic, and thermodynamic studies of the adsorption of Fe(III) metal ions and 2,4-dichlorophenoxyacetic acid onto biomass-based activated carbon by ZnCl2 activation

KIRBIYIK Ç., PÜTÜN A. E., Putun E.

SURFACES AND INTERFACES, vol.8, pp.182-192, 2017 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 8
  • Publication Date: 2017
  • Doi Number: 10.1016/j.surfin.2017.03.011
  • Journal Name: SURFACES AND INTERFACES
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.182-192
  • Keywords: Waste disposal, Activated carbon, Adsorption equilibrium, AQUEOUS-SOLUTION, METHYLENE-BLUE, DRINKING-WATER, DYE ADSORPTION, BASIC DYE, REMOVAL, ISOTHERM, WASTE, 2,4-D, BIOSORPTION
  • Anadolu University Affiliated: Yes

Abstract

This study investigated the preparation of activated carbon from low-cost biomass as precursor and the using of obtained activated carbon for the removal of Fe(III) and 2,4-D pollutants from model solution. The different parameters affecting the adsorption were examined. Equilibrium data were fitted into Langmuir, Freundlich, D-R and Temkin isotherm models for four different examined temperatures (from 20 to 50 degrees C). Adsorption of 2,4-D was well described by Freundlich isotherm as a physical adsorption, whereas Langmuir model well described the adsorption of Fe(III) at four different temperatures from 20 to 50 degrees C. Pseudo-first-order, pseudo-second-order, intra-particle diffusion and Elovich models were used to analyse kinetic data. The adsorption kinetics for both pollutants were found to match pseudo-second-order kinetic model with high correlation (between 0.975-0.999 for Fe(III), between 0.995-0.999 for 2,4-D) than the other models. In addition, the thermodynamic parameters were evaluated and discussed for the thermodynamically modeling of the adsorption processes.