ADSORPTION Ce(III) IONS USING SODIUM ALGINATES COATED MAGNETITE (Alg-Fe3O4) NANOPARTICLES

• Main Author: ALLAN SERUNTING (NIM : 20515027), MUHAMAD
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/23156
• Institution: Institut Teknologi Bandung

Cerium is a rare earth element that is widely used in human life. The increased use of cerium has the potential to be accompanied by increased cerium waste in potential pollutant environments. Cerium is relatively harmful because it can disrupt the function of the liver and lungs if it accumulates in the human body. Adsorption is an effective method for reducing pollutants such as metal ions and dyes from wastewater because the process is easy, the cost is relatively cheap and has a high effectiveness. The use of sodium alginate as an adsorbent for Ce (III) ion is not effective because the separation of an adsorbent from a solution is difficult, so the supporting material is needed to facilitate the separation process. In this study, the nanoparticles magnetite coated sodium alginate (Alg-Fe3O4) used as an adsorbent. Alg-Fe3O4 was successfully synthesized using co-precipitation methods with Fe2+; Fe3+ and alginate as precursors. The synthesized Alg-Fe3O4 nanoparticles were characterized using several instruments, such as Fourier Transform Infrared Spectroscopy (FTIR), X-ray diffraction (XRD), DelsaTM Nano C Particle Analyzer, Transmission Electron Microscopy (TEM), Scanning Electron Microscopy (SEM), Energy Dispersive Spectroscopy (EDS). Adsorbent Fe3O4-Alg has an average diameter of 13.70 nm. The optimum of adsorption process was found at pH 4, contact time 4 hours and 0.15 gram adsorbent mass by the batch method. Cerium ion adsorption process follows Langmuir isotherm model and pseudo second order kinetics model with adsorption capacity maximum (qm) of 31.83 mg g-1. The thermodynamic parameter such as ΔH = -24.98 kJ mol-1 and ΔS = -0,10 kJ mol-1K-1 represents an endothermic reaction and decrease in the degree of freedom of the adsorbed species. The synthesized Alg-Fe3O4 nanoparticles have considerable reusability, seen from the adsorption-desorption capability of 3 cycles using 0.01 M HNO3 as the desorption agent.