Document Type : Research Paper
Authors
1 Department of Environmental Engineering, College of Engineering, Mustansiriyah University, Baghdad, Iraq
2 Department of Petroleum Engineering, Faculty of Chemical Engineering, Tarbiat Modares University, Tehran, Iran
3 Department of Material Engineering, College of Engineering, University of Mustansiriyah, Baghdad, Iraq
Abstract
Adsorption behavior can be determined using different essential studies which are adsorption isotherm, kinetics, and thermodynamics. In this study, adsorption isotherm models in addition to a kinetic and thermodynamics studies are used to describe the using of alumina, as an effectiveness adsorbent, for removing vanadium (V+5) ions from aqueous solutions contaminated by this metal. The aqueous solutions used were simulate the wastewater of most traditional oil refineries. This efficiency can be determined by comparing the correlation coefficients of the linear relationships used with each model. Using alumina, perfect removal of vanadium ions was achieved. Vanadium removal increases with increasing the operating conditions which are time, temperature, agitation speed, pH, and adsorbent’s media dose; however, it is increase with eliminating the initial concentration. The study shows that the vanadium’s adsorption based on Langmuir isotherm model gives correlation coefficient of 0.9999, while when it follows Temkin and Freundlich isotherms gives less correlation coefficient; hence adsorption on the surface of alumina takes place in monolayer surface with a regular distribution of particle’s binding energy and narrow quantity of identical sites on the adsorbent surface. On the other hand, kinetic study shows that the process of adsorption matches pseudo-second order kinetic model with R2=0.9999. Also, using the thermodynamics study approves that the adsorption is spontaneous endothermic process of enthalpy change.
Keywords
)