Adsorption Of Phenol And P-Nitro Phenol Onto Date Stones: Equilibrium Isotherms, Kineticsand Thermodynamics Studies

A.K. Mohammed, Abdul-Halim; K. Theydan, Samar; J. Ahmed, Muthanna

	Adsorption Of Phenol And P-Nitro Phenol Onto Date Stones: Equilibrium Isotherms, Kineticsand Thermodynamics Studies
Journal of Engineering
Article 1, Volume 18, Issue 6, 2012, Pages 743-761
Authors
Abdul-Halim A.K. Mohammed; Samar K. Theydan; Muthanna J. Ahmed
Abstract
Adsorption capacity of a waste biomass, date stones, for phenolic compounds such as phenol (Ph) and p-nitro phenol (PNPh) was investigated. The characteristics of such waste biomass were determined and found to have a surface area and iodine number of 495.71 m2/g and 475.88 mg/g, respectively. The effects of temperature, initial sorbate concentration, and contact time on the adsorption process were studied. Experimental equilibrium data for adsorption of Ph and PNPh on date stones were analyzed by the Langmuir, Freundlich and Sips isotherm models. The results show that the best fit was achieved with the Sips isotherm equation with maximum adsorption capacities of 147.09 and 179.62 mg/g for Ph and PNPh, respectively. The kinetic data were fitted to pseudo-first order, pseudo-second order and intraparticle diffusion models, and was found to follow closely the pseudo-second order model for both Ph and PNPh. The calculated thermodynamic parameters, namely ∆G, ∆H, and ∆S showed that adsorption of Ph and PNPh onto date stones was spontaneous and endothermic under examined conditions.
Keywords
Date stones; phenol; nitro phenol; adsorption isotherms; Kinetics

Statistics Article View: 49 PDF Download: 4