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Polish Journal of Chemical Technology

The Journal of West Pomeranian University of Technology, Szczecin

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Kinetic, Equilibrium and Thermodynamic studies on the removal of Cr(VI) by activated carbon prepared from Cajanus Cajan(L) Milsp seed shell

P. Thamilarasu1 / G. Kumar1 / R. Tamilarasan1 / V. Sivakumar1 / K. Karunakaran1

Department of Chemistry, AMS Engineering College, Namakkal, 637 013, India1

Department of Chemistry, Anna university of Technology, Tiruchirappalli (Pattukottai Campus) -614 701, India2

Department of Physics, Anna university of Technology, Tiruchirappalli- 620 024, India3

Department of Chemistry, Sona College of Technology, Salem, 636 005, India4

This content is open access.
(CC BY-NC-ND 4.0)

Citation Information: Polish Journal of Chemical Technology. Volume 13, Issue 4, Pages 1–7, ISSN (Online) 1899-4741, ISSN (Print) 1509-8117, DOI: 10.2478/v10026-011-0041-6, January 2012

Publication History:
Published Online:
2012-01-02

Kinetic, Equilibrium and Thermodynamic studies on the removal of Cr(VI) by activated carbon prepared from Cajanus Cajan(L) Milsp seed shell

This paper presents the feasibility of the removal of hexavalent chromium ions from aqueous solutions by using activated carbon prepared from Cajanus Cajan(L) Milsp. It was carbonized and activated by treating it with concentrated sulfuric acid followed by heating for 5 h at 500°C. Batch adsorption experiments were carried out as a function of pH, contact time, initial concentration of the adsorbate, adsorbent dosage and temperature. The experimental data fitted well to the Freundlich isotherm. The thermodynamic parameters such as ΔH°, ΔS°, and ΔG° were calculated, which indicated that the adsorption was spontaneous and endothermic in nature. The adsorbent used in this study was characterized by FT-IR and SEM before and after the adsorption of metal ions. The results indicate that Cajanus Cajan(L) Milsp can be employed as a low cost alternative and commercial adsorbents in the removal of chromium (VI) from water and waste water.

Keywords: Adsorption; isotherm; activated carbon; chromium and seed shell

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