FABRICATION OF MAGNETITE@ZEOLITE FAU CORE-SHELL FOR METHYLENE BLUE ADSORPTION

• Main Author: Fitri Agustin, Sherina
• Format: Final Project
• Language: Indonesia
• Subjects: Kimia
• Online Access: https://digilib.itb.ac.id/gdl/view/83068
• Institution: Institut Teknologi Bandung

Methylene blue is a cationic dye that is widely used in the cotton, silk and wool fiber industries. Disposal of methylene blue waste by industry into waters will endanger the surrounding environment because methylene blue is difficult to decompose in water. The adsorption method is one solution to remove methylene blue content in industrial waste. The adsorbents used are magnetite, faujasite type zeolit and faujasite type zeolite modified with magnetite (Fe3O4). Zeolite is an aluminosilicate mineral with a negatively charged framework and has a high specific surface area so it can be used to absorb methylene blue effectively. However, often the separation of zeolit crystals from liquid systems is limited by their small size, so, in this study, zeolite was modified with magnetite nanoparticles. Separation between Magnetit@FAU zeolite and methylene blue waste was carried out using an external magnetic field. This research aims to evaluate the adsorption performance of Magnetit@FAU zeolite as an effort to reduce methylene blue waste. Characterization of FAU@Magnetite zeolite was carried out using Fourier Transform Infrared (FTIR), X-ray Diffraction (XRD), Scanning Electron Microscope (SEM) and Brunnaeur Emmet Teller (BET). Evaluation of adsorption performance was carried out by varying pH, initial adsorbent concentration, contact time and temperature. In this research, FAU zeolite and Magnetit@FAU zeolite have been successfully synthesized. This is based on the results of FTIR characterization which shows the presence of –OH stretching absorption at a wave number of 3452 cm-1, -OH bending at 1637 cm-1, and asymmetric vibrations of Si-O-Si and Si-O-Al at 1022 cm-1 and 790 cm-1. XRD characterization also shows that the typical peak of FAU zeolite is at 6.27°; 10.20°; 11.95°; 15.71°; 18.74°; 20.42°; 23.69°; 27.11°; 31.46°; 34.14° and 37.96°. The optimum adsorption conditions occur at pH 10 and a contact time of 90 minutes for 10 mL of 100 ppm methylene blue solution. Kinetic studies show that the adsorption process follows a pseudo second order model with a rate constant of 0.002 L.mol-1 min-1 for magnetite; 0.007 L.mol-1 min-1 for FAU zeolite and 0.005 L.mol-1 min-1 for FAU magnetite@zeolite. The methylene blue adsorption process uses three adsorbents following the SIPS model with a maximum capacity of 15.321 mg/g for magnetite; 42.476 mg/g for FAU zeolit and 38.81 mg/g for FAU magnetite@zeolite. Thermodynamic studies show that the adsorption process occurs spontaneously, is endothermic and has high irregularity.