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ABSTRACT
Clay is a type of small particle existing naturally on the earth’s surface. It mainly consists of water, alumina, silica and weathered rocks. Although edible clay has its medicinal properties when consumed, However, when taken by mouth for very long time it may lead to low levels of potassium, iron, and other metal ions. Therefore, this study was designed to investigate the use of edible clay in the adsorption of calcium ions in its aqueous solutions and how much of these ions can be adsorbed by the clay in its raw state and when modified using disodium EDTA. , adsorbent characterization and the effect of parameters such as time, initial pH, initial concentration and Dosage of adsorbents, were the methods employed in the analysis of the adsorption study of edible clay. The result of this study suggests that calcium ions can be adsorbed in significant amounts using edible clay with a value of 12mg/g for the Modified clay and 11.75mg/g for the unmodified clay ,for the effect of adsorbent dosage against time ,the equilibrium contact time needed was 30mins(unmodified) and 60mins(modified).Optimum pH and Concentration for maximum adsorption was 12(Unmodified (91.6mg/g) and modified (97.6mg/g)) and 50mg/L(modified (21.80mg/g) and unmodified(21.70mg/g) . It also suggests that at a pH of high basicity, maximum adsorption may occur. The digestion of the clay revealed that the clay samples contain 0.3mg/L of calcium and magnesium ions, Manganese and Nickel ions (0.15 mg/L). In the batch mode adsorption study, percentage removal of metal ion increased with increase of the amount of adsorbent and the amount of metal ion adsorbed increases with a decrease in the amount of adsorbent. The increase in initial ion concentration increases the amount of metal adsorbed (mg/g), whereas the extent of adsorption is deceased. The freundlich model better represented the adsorption process than the langmuir model. The pseudo second order model represents the adsorption process better than the pseudo first order which demonstrates the chemisorption process.
