Abstract
The adsorption behavior of atenolol molecule over the pristine carbon nanotube and boron nitride nanotube as well as functionalized carbon nanotube was performed employing the B3LYP and CAM-B3LYP methods with 6-311G(d, p) basis set in two phases (gas and water solution). We used natural bond orbital, non-covalent interactions and the quantum theory of atoms in molecules to investigate the hydrogen bonds, interaction energies and charge transfers between the atenolol drug and nanosystems. In all cases, the process of intermolecular interaction between atenolol and nanosystems is exothermic showing that the optimized complexes are stable. The hydrogen-bonding interactions between drug and CNT–(COOH)3 play an important role for the different kinds of adsorption. In addition, data showed that there is a large charge donation and back-donation for atenolol adsorption on the surface of CNT–(COOH)3. Results indicated that although in the case of pristine carbon nanotube, the adsorption is weak, functionalization of carbon nanotube with –COOH groups can effectively modify the surface of nanotubes towards atenolol molecules adsorption and improve their solubility in water solution.
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