SYNTHESIS of METAL-ORGANIC FRAMEWORKs (MOFs) Cu-BDC by ELECTROSINTESIS METHOD AS CATALYST TO DYES REMOVAL

• Main Author: Wahyu Yusariarta Putra Par, Ade
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/33929
• Institution: Institut Teknologi Bandung

Advanced Oxidation Processes (AOPs) is one of promising technology to degrade recalcitrant pollutant such as synthetic dyes. Among the many known AOPs, photocatalysis has been proven to be a promising technology to degrade synthetic dyes. Photocatalysis with heterogeneous semiconductor materials has disadvantages such as low catalytic activity. Catalytic activity can be enhanced by increasing specific surface area. Metal-Organic Frameworks (MOFs) are promising to overcome this problem because they have high surface area and behave like a semiconductor under light irradiation. Various MOFs have been tested for catalytic activity, including Cu-BDC (copper 1.4-benzendicarbosylate) which have excellent catalytic activity as heterogeneous catalysts for the acetalization of alcohol compounds. Also, Cu-BDC can be reused without a significant decrease in activity. At present, the solvothermal method is the most common used method for MOFs preparation. However, this method requires long preparation times and high temperatures. Electrosynthetic method might be promising to solve this limitation because this method already used by researchers at BASF to synthesize Cu-BTC (HKUST-1) with faster preparation time and lower temperature than solvothermal method. In this study, Cu-BDC was prepared by electrosynthetic method with variations in voltage of 5, 10, 15 V to know the effect of voltage in the synthesis process on the characteristics and catalytic activity of the Cu-BDC. Characteristics of obtained Cu-BDC were evaluated by Fourier Tranform Infra Red (FTIR) method, X-Ray Diffraction (XRD), and Scanning Electron Microscopy- Energy Dispersive X-ray Spectroscopy (SEM-EDS). Based on the results of FTIR and XRD, both of Cu-BDC that were fabricated by solvothermal and electrosynthesis methods showed that obtained samples contain a mixture of N, N-dimethillformamide (DMF)-Cu-BDC and DMF free-Cu-BDC. Cu-BDC that were prepared by electrosynthesis method have 7 times smaller of particle size than solvothermal method. By increasing voltage, particle size of Cu- BDC decreased, catalytic activity enhanced, and activation energy declined. This study revealed that the optimum voltage to prepare Cu-BDC using electrosynthesis method is 15 V, with average particle size of 0.36 ± 0.09 µm (16 times smaller than Cu-BDC produced with solvothermal method), able to degrade 90% methylene orange within 16 minutes (16% faster than Cu-BDC produced by solvothermal method), the activation energy is 31.6 kJ / mol (19% lower than Cu-BDC produced with solvothermal method).