Photocatalytic Degradation of Organic Dyes in Wastewater by using A New Series of Metal Organic Frameworks (MOFs) Containing Benzophenone-4,4'-dicarboxylate (BPnDC) and various N,N'-donor Organic Spacers
Abstract:
Metal organic frameworks (MOFs) are new type of porous materials which is rapidly developed in many research fields. This research deals with the systematic synthesis, structural characterization and functional properties of new MOFs based on types of carboxylate ligands. The central aim is to generate new compounds of MOFs which is focused on the core features of crystal engineering, dyes adsorption and photocatalytic degradation of organic dyes. Two novel coordination frameworks {[Cu(bpy)(sba)(DMF)(H2O)](H2O)0.5}n (1) and {[Cu(bpy)(sba)2][Cu(bpy)(H2O)4](H2O)2}n (2) were successfully synthesized and structurally characterized. Compounds 1 and 2 show different structural architectures of 1D chains with remarkable solvent-directed feature. Compound 1 shows neutral 1D chain structure which is further linked by π-π stacking interactions and hydrogen bonds to form a 3D supramolecular architecture. While 2 exhibits two-independent infinite 1D chains structure that are further extended by hydrogen bonds and C-H···π to form a 3D supramolecular architecture. Interestingly, 1 irreversibly transformed to 2 through SC-to-SC transformation (1→2). The functional performances of 2 toward anionic dyes adsorption properties were evaluated. This adsorbent exhibits the highest adsorption capacity for congo red (CR2‾) (2462 mg/g), comparing with acid blue45 (AB2-, 710 mg/g) acid red73 (AR2-, 60 mg/g) and methyl orange (MO-, 575 mg/g). Moreover, the results show that 2 can separate AB2- from the mixed solution of AB2- and MO-. Furthermore, 2 is capable as potential reusable adsorbent to remove anionic dyes, especially congo red and also being active to separate organic dyes with different charges.