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

Mohammed, Suhad S.; Aziz, Nazk M.; Abdul Karem, Lekaa K.

doi:10.21608/ejchem.2021.75540.3703

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

Document Type : Original Article

Authors

¹ Department of Chemistry, College of Education for Pure Sciences, Ibn Al-Haitham University of Baghdad, Iraq

² Department of Chemistry, College of Science, University of Sulaimani, Kurdistan- Iraq

³ 1,3Department of Chemistry, College of Education for Pure Sciences, Ibn Al-Haitham University of Baghdad, Iraq

10.21608/ejchem.2021.75540.3703

Abstract

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

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