Thermodynamics and Instrumental Analysis of Bismarck Brown R Dye onto Activated Carbon Prepared from Delonix Regia Pods (Flame Tree)

A. Rajappa¹, K. Ramesh ², V.Nandhakumar^3*, M. Pugazhenthi⁴ and S.Sivajiganesan^4 
1Department of chemistry, Sri Manakula Vinayagar Engineering College, Madagadipet, Puducherry, India.
²Department of chemistry, Arasu Engineering college, Kumbakonam, Thanjavur, India.
3*&4 Department of chemistry, A.V.V.M Sri Pushpam college, Poondi, Thanjavur, India.

Abstract
This work deals with the study of adsorption Bismarck Brown R dye from aqueous solution onto Carbon prepared from Delonix regia pods activated with Zinc chloride (DRZAC). Batch mode adsorption experiments were conducted. The characteristics of the DRZAC were determined by SEM, XRD, FTIR, BET analysis and pH_ZPC. Thermodynamic parameters for such as ΔH°, ΔS°, and ΔG° were determined using Van’t Hoff plots. Analysis of these values inferred that the adsorption was endothermic and spontaneous with increased randomness. The FTIR and XRD studies confirmed that adsorption was physisorption with partial chemisorption. The results in this study indicated that DRZAC could be employed as an adsorbent for the removal of Bismarck Brown R dye from an aqueous solution.
Keywords: Adsorption, Delonix regia ZnCl₂ activated carbon, Bismarck Brown R dye, Thermodynamic study, Instrumental (FTIR, XRD, SEM,) analysis.