تحضير وتشخيص دقائق اوكسيد القصدير النانوية وتطبيقاته في إزالة حامض المفنياميك من المحاليل المائية

Synthesis, Characterization of SnO2 Nanoparticles and their application in the Removal of Mefenamic Acid from Aqueous Solutions

SnO2 nanoparticles have been prepared using the chemical precipitation method and the green method. Different parameters such as the concentration of the starting materials, reaction time, and pH of the solution were studied to control the growth process of tin oxide nanoparticles. The formation of Tin oxide nanocrystals was confirmed through Field emission Scanning Electron Microscopy (FE-SEM), Energy Dispersive X-ray Spectroscopy (EDX), Fourier transform infrared (FT-IR), X-Ray Diffraction (XRD), and Transmission Electron Microscopy(TEM).The UV-visible curve in the DRS spectrum was used to estimate the band gap energy and it turned out to be 3.7eV and 4.2 eV for both bare SnO2 and SnO2:P.O NPs, respectively. Indicating, the effect of quantum confinement which is believed to appear as the particle’s size gets smaller. The adsorption behavior of SnO2 nanoparticles was demonstrated and it was found that SnO2 particles can adsorb mefenamic acid (MFA) from aqueous solutions. The maximum removal efficiency for the removal of mefenamic acid using SnO2:P.O nanoparticles is 97% after 30 minutes. Whilst, bare SnO2 nanoparticles gave 92 % after 80minutes.

Thermodynamic estimation (Gibbs free energy ∆G, enthalpy ∆H, and entropy ∆S) showed that the adsorption of the MFA on bare SnO2NPs was spontaneous and endothermic, while on the SnO2:P.O NPs was spontaneous and exothermic. The rates of adsorption of MFA onto the samples were investigated using Pseudo-first order (PFOM) and Pseudo-second order (PSOM). Was found follows a pseudo-second-order model, (PSOM) for all bare SnO2 NPs and SnO2:P.O NPs. The adsorption of MFA on bare SnO2 and SnO2 :P.O NPs fitted with Freundlich model.