Реферат: In the last few decades, great concern has been raised on the increasing number of pharmaceuticals which were detected at different levels in diverse water environments, such as wastewater, surface water, groundwater, and even drinking. Diclofenac (DCF) is one of the most frequently detected non-steroidal anti-inflammatory drugs in the water environmental. Therefore, it has become urgent to find new useful methods for the removal of DCF from aqueous solutions. Herein, we investigated adsorption capacity of porous metal-benzenetricarboxylates (MOFs), such as MIL-100(Al, Fe and Cr), MIL-110(Al) and MIL-96(Al) towards DCF. Adsorption of 20-750 mg/L of diclofenac on MOFs from aqueous solutions was investigated without any additions at 25 oC. Combination of physicochemical methods and mathematical modeling (Langmuir, Freundlich and Temkin models) was used for the analysis of the adsorption mechanism. Adsorption capacity was demonstrated to rise with increasing amount of Lewis acid sites determined by EPR spectroscopy using 2,2',6,6'-tetramethyl-1-piperidinyoxyl radical as the probe molecule in the order: MIL-96(Al) > MIL-110(Al) > MMIL-100(Al) > MIL-100(Cr) > MIL-100(Fe) It was found that structural and textural properties affect adsorption of DCF. Thus, the increasing microporosity of MOFs led to the decreasing adsorption capacity, while increasing specific surface area favoured to rising adsorption value. Experimental data point that adsorption of DCF involves electrostatic interaction between functional groups of MOFs and DCF and p-p interaction/stacking. The comparison adsorption capacity of Carbon materials were lower in compared with that of studied MOFs.

Библиографическая ссылка: Timofeeva M.N. , Shvydko A.V. , Simonov P.A. , Jhung S.H.
Insights into Adsorption of Diclofenac on Metal-Organic Frameworks
4th International Conference on Bioresources, Energy, Environment, and Materials Technology 06-09 Sep 2020