Removal of Acetylsalicylic Acid from Water Using N-Pyrazole Modified Silica Gel

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Akkad, Haya Basem
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جامعة النجاح الوطنية
Water pollution is one of the most serious ecological threats we face today. The pharmaceutical drugs are emerging pollutants, which may cause serious hazards on human beings and on the environment. Therefore, from last two decades, plenty of studies were conducted on the occurrence, impact, and removal of pharmaceutical residues from the environment. Many technologies including physical, biological and chemical processes have been extensively investigated for the removal of pharmaceutical compounds from water. This work is focused on the applications of new N-pyrazole-functionalized silica for selective extraction and elimination of ASA from water. The adsorption potential of Silica gel supported N-pyrazole ligand (SiPz) to remove Acetylsalicylic Acid from water was studied. The effect of various parameters on the removal process was investigated. Such parameters included; pH, initial concentration of Acetylsalicylic Acid, Temperature, adsorbent dosage and contact time. Moreover, the adsorption isotherms were investigated and the reaction order was determined. Results revealed that the maximum percent removal of Acetylsalicylic Acid by SiPz was 65% after 20 min of shacking at solution conditions of 20oC, 10 mg of adsorbent dose at pH 7.0 and 50 mg/L of Acetylsalicylic Acid solution. The equilibrium concentration of Acetylsalicylic Acid in the supernatant was measured by UV-vis spectrophotometer. The results showed that the adsorption followed Freundlich isotherm and the adsorption kinetics followed pseudo-second order kinetic adsorption model.