Collect. Czech. Chem. Commun. 1993, 58, 474-482

Thermodynamics of Adsorption of Methyl Formate on Metal Dopant/Active Carbon Systems

Muhammad Afzal and Fazal Mahmood

Department of Chemistry, Quaid-I-Azam University, Islamabad, Pakistan


It has been found that doping of active carbon with metals (Ni, Cu, Zn, Cd) decreases its surface area due to dispersion of metal resides on the surface. A detailed examination of nitrogen adsorption indicates differences in the mode of dispersion of metals on the surface of active carbon. The adsorbing behavior of metal doped carbon for methyl formate was also studied as a function of temperature. From adsorption data, thermodynamic parameters such as free energy, enthalpy and entropy of adsorption were calculated using virial isotherm expression and interpreted. Results show that metal dopant/active carbon systems are synergic, exhibiting greater adsorption affinity for methyl formate than the sum of its constituents.