Abstract
In this paper, we present a theoretical evaluation and explanation of the adsorption mechanisms of methylene blue or malachite green dyes on a metalloporphyrin [Co-II(TMPP)]. This theoretical investigation was carried out by a dual-energy monolayer adsorption model that was developed using statistical physics. The modeling findings show that the adsorption of the dyes studied is due to a molecular aggregation process in aqueous solution, which is dependent the temperature of adsorption. These MG or MB molecules were linked or adsorbed onto the [Co-II(TMPP)] surface by a non-flat deposition under the observed the conditions of utilization with thermal stirring and steric hindrance, which may have an important role during adsorption. Similarly, [Co-II(TMPP)] metalloporphyrin exhibited the strongest adsorption for methylene blue dyes, particularly at 318 K. Similarly, the adsorption capacities ranged from 96.12 to 110.53 mg/g for methylene blue and from 91.54 to 101.67 mg/g for malachite green, respectively. The endothermic energies of adsorption were investigated for the studied adsorbate molecules, and ranged from 17.67 to 24.17 kJ/mol, showing that physical forces are used to remove of these two dyes from water pollutants. This study facilitates the understanding of the physico-chemical param6eters which govern organic molecules adsorption on the surface of [Co-II(TMPP)], an alternative method used for water treatment and purity.