In this study, activated carbon was prepared from the commercial ideal charcoal found in the Libyan local market. By heating it at a temperature of 650 ℃ for two hours after grinding, and wash it with filtered water several times to get rid of impurities and dry it. This work was divided into three parts: the first part did not afford any treatment process and the second part was chemically treated with orthophosphoric acid in different concentrations (30%, 40%, 60%, 80%) by volume and the third part was treated with potassium hydroxide in different concentrations (1M ,M2, M3, M4) used to remove theoria from its aqueous solutions at room temperature. The obtained results showed that the process of removing theoria from the aqueous solution is the adsorption process and follows the friendliest equation where the correlation coefficient value reached (R2= 0.9674) .The results also showed that the highest adsorption amount of theoria when using activated charcoal with a concentration (40%) of Phosphoric acid The obtained results indicated that the best adsorption of theoria over activated charcoal treated with potassium hydroxide was at 3M concentration, which is the best result obtained from the study.