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Tamilselvi S.,Erode Arts and Science College Atonomous | Asaithambi M.,Erode Arts and Science College Atonomous
Rasayan Journal of Chemistry | Year: 2015

An activated carbon with good surface characteristics was prepared from eco-friendly and renewable source (silk cotton fibers) using microwave hydrothermal heating process. The column mode adsorption studies of an anionic dye Acid blue 113 with a molecular formula (C32H21N5Na2O6S2) were demonstrated. The Bohart-Adams, Thomas and Yoon-Nelson kinetic models were used in this study. The YN model provides excellent fit with very high r2 (0.9611 to 0.9873) for all the range of concentration, flow rate and bed height under investigation. ©2015 RASĀYAN. All rights reserved. Source


Gopal N.,Erode Arts and Science College Atonomous | Asaithambi M.,Erode Arts and Science College Atonomous
Rasayan Journal of Chemistry | Year: 2015

An activated carbon was prepared by ZnCl2 activation method using Prosopis juliflora seeds. The prepared AC was embedded in polyaniline inert matrix (PPAC). It was used for the adsorptive removal of Acid Blue 40 (AB 40) dye. The PPAC has exceptionally well developed porosity with a surface area of 1028 m2/g. The maximum percentage (92.7%) of adsorption observed at a pH of 3 and the percentage of adsorption decreased on increasing the pH. The kinetics of AB40 adsorption analyzed using pseudo-first order and pseudo-second order kinetic equations. The study revealed that the adsorption initially follows second order and in the later stages it follows pseudo-first order kinetics. The activation energy obtained for the adsorption of AB40 by PPAC is 77.30 kJ/mol, indicating the weak forces of attraction between solute and sorbent. Standard enthalpy change ΔH° is 61.214 kJ/mol (less than 80 kJ/mol) substantiate the physisorption and the positive sign indicate the endothermic nature of AB40 adsorption by PPAC. © 2015 RASAYAN. All rights reserved. Source

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