ADSORPTION OF MNO ? IONS USING MODIFIED NATURAL ZEOLITE - PROPYLAMINE

• Main Author: Amalia Fitranty Almira, Tasya
• Format: Final Project
• Language: Indonesia
• Subjects: Kimia
• Online Access: https://digilib.itb.ac.id/gdl/view/75475
• Institution: Institut Teknologi Bandung

MnO – ions are widely used as oxidizers in laboratories and chemical industries. According to the National Institute of Occupational Safety and Health (NIOSH) report, KMnO4 is ? classified as a hazardous substance. Therefore, the concentration of MnO4 ? ions must be reduced to the allowed standard, 0.05 mg/L. In this study, MnO4 ions were adsorbed using naturally modified zeolite with 3-Aminopropyl triethoxysilane (APTES), resulting in natural zeolite-propylamine. The FTIR spectrum indicated the successful synthesis of natural zeolite-propylamine. The peak at the wavenumber 2935 cm?1 (C-H stretching) in the FTIR spectrum confirms the successful modification. The XRD diffraction pattern shows that natural zeolite-propylamine has better crystallinity, precisely 63.86%, compared to natural zeolite at 60.07%. SEM-EDS characterization reveals changes in the surface morphology of natural zeolite before and after adsorption, and the weight percentage of Mn in natural zeolite-propylamine after adsorption is 4.61%. The optimum conditions for the ? adsorption of MnO4 ions by natural zeolite-propylamine are achieved at pH 5, a contact ? time of 6 hours (with 10 mL of MnO4 ion solution, concentration of 500 ppm, and a stirring speed of 30 rpm). The adsorption process follows a pseudo-second-order kinetic model with a rate constant of 1.426 x 10-3 mg/L.min. Adsorption follows the Langmuir adsorption isotherm model with a maximum adsorption capacity of 39.447 mg/g. Thermodynamic ? studies of MnO4 ion adsorption indicates that the adsorption is spontaneous and endothermic, which the value of ?H and ?S is 32.11 kJ·mol?1 and 223.45 J·K?1·mol?1, respectively.