Swiss blue dye sequestration by adsorption using Acacia nilotica sawdust. (30th March 2011)

• Record Type: Journal Article
• Authors: Jain, Monika; Mudhoo, Ackmez; Garg, Vinod Kumar
• Is Part Of: International journal of environmental technology and management. Volume 14:Number 1/4(2011)
• Page Start: 220
• Page End: 237
• Publication Date: 2011-03-30
• Subjects: wastewater treatment -- Acacia nilotica sawdust -- batch adsorption -- FTIR -- SEM -- Swiss blue dyes -- dye sequestration -- biosorbents -- dye removal -- kinetics; Environmental management -- Periodicals; Green technology -- Periodicals; 333.705
• Languages: English
• ISSNs: 1466-2132

Abstract

Batch adsorption studies were conducted to investigate the potential of Acacia nilotica sawdust as biosorbent for removal of basic Swiss blue dye from wastewater. Sawdust was subjected to formaldehyde pretreatment (FSD) and boiling (BSD). Maximum dye removal was observed after 120 min for all conditions – FSD: 97.5% and BSD: 95.9% at pH 6, 50 mgL−1 dye concentration and 0.2 g/50 mL adsorbent dosage. Adsorption was endothermic and was accompanied by an increase in entropy and a decrease in Gibbs free energy for 288?333 K. Equilibrium data fitted excellently with the Langmuir isotherm (FSD: R² &#61 0.9955, BSD: R² &#61 0.9914). Adsorption kinetics was found to follow pseudo-second-order model (R² > 0.99, FSD and BSD). It can be concluded that formaldehyde-treated sawdust (FSD) can be used as a more efficient and low-cost alternative to the chemically untreated sawdust in aqueous solution for Swiss blue dye removal.