Preparation and Diagnostics of Schiff Base Complexes and Thermodynamic Study for Adsorption of Cobalt Complex on Iraqi Attapulgite Clay Surface

Three new complexes of Co(II), Ni(II), and Zn(II), containing ligand Schiff base (DHMA) derived from methyldopa (mdop) with 3-hydroxybenzaldehyde have been prepared. The synthesized its were diagnostics by using different physical techniques, results showed that the an octahedral shape. In addition it has studied adsorption behavior, Uv-Vis technique applied to survery isotherm adsorption. possibility applying langmair equation. effect temperature on Co-complex surface Iraqi Attapulgite clay was studied. thermodynamic functions ΔGο, ΔHο ΔSο Co- complex she ΔGο =(-10.7766, -11.5205, -12.3537)KJ/ mol, this is evidence process a spontaneous while ΔSο=( 63.6461)J/ mole.K which means increase in randomness. value (8544.29)J/mole indicate endothermic natural process.