Enhanced adsorption of congo red from aqueous solutions by chitosan hydrogel beads impregnated with cetyl trimethyl ammonium bromide
- Title
- Enhanced adsorption of congo red from aqueous solutions by chitosan hydrogel beads impregnated with cetyl trimethyl ammonium bromide
- Date Issued
- 2009-06
- Publisher
- ELSEVIER SCI LTD
- Abstract
- The adsorption of congo red (CR) onto chitosan (CS) beads impregnated by a cationic surfactant (CTAB, cetyl trimethyl ammonium bromide) was investigated. Chitosan beads impregnated at a ratio of 1/20 of CTAB to CS (0.05% of CTAB and 1% of CS) increased the CR adsorption capacity by 2.2 times from 162.3 mg/g (0% CTAB) to 352.5 mg/g (0.05% CTAB). The CR adsorption decreased with an increase in pH of the CR solution from 4.0 to 9.0. The Sips isotherm model showed a good fit with the equilibrium experimental data and the values of the heterogeneity factor (n) indicated heterogeneous adsorption of CR onto CS/CTAB beads, as well as CS beads. The kinetic data showed better fit to the pseudo second-order rate model than to the pseudo first-order rate model. The impregnation of CS beads by cationic surfactants showed the highest adsorption capacities of CR compared to any other adsorbents and would be a good method to increase adsorption efficiency for the removal of anionic dyes in a wastewater treatment process. (c) 2008 Elsevier Ltd. All rights reserved
- Keywords
- Adsorption; Chitosan bead; Congo red; CTAB; Surfactant; SURFACTANT-MODIFIED MONTMORILLONITE; ACTIVATED CARBON; COIR PITH; REMOVAL; DYES; IONS; EQUILIBRIUM; ADSORBENTS; EFFLUENT; BEHAVIOR
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/29026
- DOI
- 10.1016/J.BIORTECH.2
- ISSN
- 0960-8524
- Article Type
- Article
- Files in This Item:
- There are no files associated with this item.
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.