ADSORPTION OF LA(III) USING ALGINATE MAGNETITE COMPOSITES WITH BORIC ACID CROSSLINKER

• Main Author: Farhatunnisa El-Baehaqi, Syifa
• Format: Final Project
• Language: Indonesia
• Subjects: Kimia
• Online Access: https://digilib.itb.ac.id/gdl/view/71595
• Institution: Institut Teknologi Bandung

The increase in demand for rare earth metals (Rare Earth Metals) continues to increase every year, rare earth metals have similar physical and chemical properties, making it difficult to separate them. The need for Rare Earth Metals (REE) continues to increase every year. Lanthanum is one of the REE used in hybrid car batteries, flint in cigarette lighters, substance to improve optical properties and alkali resistance of glass, as well as catalysts in oil refining processes. The increasing need for and use of rare earth is accompanied by an increase in the potential for pollution of rare earth ions in the environment. Adsorption is one of the most popular separation techniques because it is easier and cheaper. In this study, a Magnetite Alginate composite with a Boric Acid crosslinker (MAB) was prepared for the adsorption of La3+ ions. In this study, the Magnetite Alginate composite with Boric Acid (MAB) crosslinker was used as an adsorbent. The FTIR spectrum of the adsorbent shows the absorption of Fe-O bonds at wave number 588 cm#$. The typical absorption of alginate is found at wave number 3380 cm#$, which is the vibration of the O-H bond, 1605 cm#$ for C=O asymmetry vibration, 1394 cm#$ for C=O symmetry vibration, and 1030 cm#$ for C-O-C vibration. The adsorbent diffractogram showed peaks corresponding to the magnetite JCPDS, which identified the presence of magnetite in the MAB composite. Adsorption of La (III) ions using the batch method reached its optimum conditions at pH 4 and contact time of 4 hours with the adsorbent mass of 0.05 gram. The adsorption process of La (III) ions followed the Langmuir isotherm model with a maximum adsorption capacity (qm) of 30.87 mg g-1 and a pseudo-secondorder kinetic model. Adsorption of La (III) using MAB was an endothermic process, with a value of ?H = 59 kJ/mol, accompanied by an increase in system entropy and took place spontaneously