Performance, Kinetics, and Equlibrium in Textile Dye  Remediation by Agricultural Waste Biomass as A Low  Cost Adsorbent

V.Sivakumar; M. Asaithambi; P.Sivakumar

Volume : III, Issue : X, October - 2013

Performance, Kinetics, and Equlibrium in Textile Dye Remediation by Agricultural Waste Biomass as A Low Cost Adsorbent

V. Sivakumar, M. Asaithambi, P. Sivakumar

Abstract :

Highly active carbons X1 and X2 were prepared from the seeds of Xanthium strumarium L using Phosphoric acid and KOH as chemical activating agents respectively. The adsorption ability of the prepared adsorbents was analysed using Congo Red (CR) dye. The SEM images show that the adsorbent has well developed porosity with more adsorption functionalities. Both the adsorbents show a decreasing trend of adsorption on increasing the pH due to repulsion of similar charges at higher pH. Increase in sorptive removal of CR with increase in temperature may partly attribute to chemisorptions as well as endothermic nature of adsorption. Out of six isotherm models tested the Langmuir, Freundlich and Harkins–Jura isotherms are more appropriate to demonstrate the adsorption with a high correlation coefficients. Pseudo second–order model better represents the adsorption kinetics between the carbon and CR. The adsorption rate is film diffusion controlled during the initial stages of the adsorption of CR and in the later stages the rate is controlled by intra particle diffusion.