EFFECT OF IONIC LIQUIDS ON ELECTROSYNTHESIS OF CuBDC TYPE METAL-ORGANIC FRAMEWORKS

• Main Author: Mukaromah, Laela
• Format: Theses
• Language: Indonesia
• Subjects: Kimia
• Online Access: https://digilib.itb.ac.id/gdl/view/37919
• Institution: Institut Teknologi Bandung

CuBDC type metal-organic frameworks (MOFs) were constructed from Cu 2+ metal ion cluster and 1,4-benzenedicarboxylic ligand (BDC) with Cu2(BDC)2 secondary building units (SBUs) had been successfully synthesized using electrosynthesis method. Electrosynthesis of CuBDC was conducted at room temperature for 2 h using current density of 10 mA/cm 2, voltage variation of 5-15 V and ionic liquids variation of[bmim][BF4], [bmim][DCA] and MTBS (0.5 and 1 mrnol/10 mL DMF) as electrolyte. Electrosynthesized CuBDC was characterized using Fourier Transform Infrared Spectroscopy (FTIR), Powder X-Ray Diffraction (PXRD), Scanning Electron Microscopy (SEM), Thermogravimetric Analysis (TGA) dan nitrogen physisorption. Average crystallite size and productivity of electrosynthesized CuBDC were compared with solvothermal method. FTIR data confirmed the coordination of BDC ligand to Cu2+ metal ion indicated by shifting ofBDC carbonyl group vibration to smaller wavenumber from 1680 to 1667 cm-1 Characteristic pattern of CuBDC X-ray diffraction peaks was showed at 28 of 10.23°, 17.26° and 24.96°. Electrosynthesized CuBDC showed thermal stability up to 325 °C. Electrosynthesis ofCuBDC using ionic liquids variation of[bmim][BF4], [bmim][DCA] and MTBS resulted average crystallite size and productivity of24.7 nm, 22.1 nm, 20.5 nm and 236 mg/h, 69 mglh, 291 mglh respectively, while solvothermal method was 27.3 nm and 37 mglh. BET surface area of electrosynthesized CuBDC using ionic liquids variation of [bmim][BF4], [bmim][DCA] and MTBS was 72.8 m2/g, 60.5 m2/g and 57.1 m2/g, respectively. Degassing on electrosynthesized CuBDC showed different characteristic pattern of X-ray diffraction peaks. Thus, it indicated the change of CuBDC structure from monoclinic to triclinic crystal system due to the loss of DMF molecules coordination. Application of ionic liquids on electrosynthesis of CuBDC type MOFs produced smaller average crystallite size and higher synthesis productivity up to 7x per hour compared with solvothermal method.