الفهرس 
AcknowledgementOnly 14 pages are availabe for public view
 |  | from | 132 |  |  |
| | | from | 132 | | |
Abstract
The adsorption behavior of Hematoporphyrin IX and Hematoporphyrin Di-hydrochloride on Kaolinite and Montmorillonite clay minerals were studied. The experiments were carried out by using three different solvents having different dielectric constants (water, Methanol and Ethanol). The effect of temperature (5 and 25’c) on porphyrin adsorption was also examined. Three stages of adsorption were specified for the adsorption of these two porphyrins on both of the studied clays. The difference between these two porphyrins adsorbed in stage II where the isotherm of HP-IX become convex to the X-axis while for HP.2HCI, it was convex to y- axis .The adsorption of HP-IX or HP.2HCI on the two clays differed noticeably from the reaction that occurred in most of the inorganic cations and anions on such clays. An increase in temperature cause an increase rather than a decrease in porphyrin adsorption, which means the adsorption was endothermic reaction. Also the adsorption of porphyrins increased with increasing the dielectric constant of the solvent.It was observed that the adsorbed amount in the case of HP.2HCI was higher than that of HP-IX, this due to the nature of the functional groups on these two different porphyrins. Also the increase in the molecular weight of HP.2HCI may increase the adsorbed amount of that porphyrin .Langmuir and Freundlich’s equations were used to analyze the adsorption behavior of these two porphyrins to quantify the adsorption isotherms .The adsorption of HP.2HCI on Kaolinite and Montmorillonite confirmed to the linear form of Langmuir equation. The maximum adsorption derived from the equation showed higher values for Montmorillonite than Kaolinite in presence of water and methanol. This was attributed to the higher adsorption capacity Montmorillonite. Contrary to that, for HP.2HCI in ethanol; this maximum adsorption was higher for Kaolinite than Montmorillonite due to porphyrin agglomeration .The maximum adsorption under all conditions increased by increasing the temperature. Diffusion and reconfirmation of the porphyrin molecules assumed to be the major consumer steps throughout the adsorption course. The bonding term; related to Langmuir equation gave higher values for HP.2HCI on both of the clays in presence of water and methanol than ethanol .The adsorption of HP-IX and HP.2HCI on these two clays obey freundlich equation, suggesting that the porphyrin might be adsorbed onto the clay surfaces mostly through physical adsorption.The adsorption of HP-IX on Kaolinite indicated that two adsorption mechanisms were involved throughout its adsorption isotherms. The adsorption affinity for the final parts were higher than the initial parts .