(101g) Silver- and Copper- Immobilized-Graphene Oxide Metal Organic Frameworks for Enhanced Adsorption in Water Treatment.

In this study, metal-organic frameworks (MOFs),including silver-based MOF(Ag-MOF) and copper-based MOF (Cu-MOF),were reinforced by graphene-oxide (GO)as novel adsorbents for water treatment. The novel structural and physicochemical properties of the reinforced GO-Ag-MOF and GO-Cu-MOF were studied and compared with standard Ag-MOF and Cu-MOF. The materials are characterized by X-ray diffraction, sorption of nitrogen, Ultraviolet spectroscopy (UV-vis), Fourier Transform infrared spectroscopy (FT-IR) and scanning electron microscopy (SEM).The adsorption processes of methylene blue from aqueous solution on Ag-MOF, Cu-MOF, GO-Ag-MOF and GO-Cu-MOF were compared. In addition, the dye removal capacities of all these MOF materials were thoroughly evaluated at various pH values, temperatures, and dye and adsorbent concentrations. The kinetics and thermodynamic behavior of the synthesized MOF compounds as the adsorbent used for dye removal from aqueous media were evaluated at different pH values (2-12), temperatures (20-70oC),and concentrations (0-150 ppm). The surface charge, surface area, number of active sites, and particle size were evaluated as the most influential factors on the adsorption process of dye on synthesized MOFs.