Efficient Removal of Omeprazole from Water Samples by Utilizing of Carbon Nanotubes as Powerful nanoadsorbent and Comprising with Graphite: Kinetic and Thermodynamic studies

In this study, multi wall carbon nanotubes (MWCNTs) were utilized as powerful nanoadsorbants for efficient removal of Omeprazole (OMP) from water samples and comprised with graphite (GR). Effective parameters on removal efficiency including, pH, contact time and ionic strength were optimized by using one factor at a time optimizing method. Results showed that maximum removal of OMP was occurred at pH=5.0 after 30.0 min for both MWCNTs and GR. Kinetic models were employed to investigate the data corresponding to the adsorption of OMP on the surface of MWCNTs and Gr. Results revealed that the pseudo second-order model for adsorption of OMP on the surface of both MWCNTs and GR indicate the high ability of this model for representation of the data. Adsorption equilibrium studies indicated that the Langmuir isotherm efficiently represented both MWCNTs and GR adsorption data. Maximal adsorption capacity for 25.0 mg L-1 of OMP was calculated about 166.706 mg g-1 and 16.321 mg g-1 for MWCNTs and GR, respectively. The thermodynamic of adsorption process was investigated. Results exhibited that adsorption of OMP on the adsorbents is an exothermic process. As a result, this study can be used to remove ibuprofen from hospital and domestic wastewater.