SYNTHESIS AMINE FUNCTIONALIZED BENTONITE FOR HG (II) ION ADSORPTION

• Main Author: Muhamad, Diwan
• Format: Final Project
• Language: Indonesia
• Subjects: Kimia
• Online Access: https://digilib.itb.ac.id/gdl/view/59590
• Institution: Institut Teknologi Bandung

Mercury is a dangerous heavy metal that can be emitted into the waters due to increased industrial activities. Mercury species in water are generally in the form of Hg (II) ions. Uncontrolled levels of Hg (II) ions can cause health problems and damage aquatic ecosystems. Therefore, it is necessary to remove Hg (II) ions as a form of controlling Hg (II) ion pollution in the waters. The method that is often used in the process of removing Hg (II) ions is adsorption because it is simple and economical. Bentonite is one type of adsorbent that can be modified to increase its adsorption capacity. APTES is one of the modifying agents on adsorbents containing an amine group that can bind well to Hg (II) ions based on the HSAB theory. This study aims to synthesize and characterize amine-functionalized bentonite and to examine the effect of amine modification, the effect of adsorption parameters and to study the adsorption isotherm and adsorption kinetics of amine-modified materials. The synthesis of bentonite-APTES was carried out by refluxing acid-activated bentonite with 3-aminopropyl- triethoxysilane (APTES) and toluene as solvent. The synthesized bentonite-APTES were characterized using FTIR, XRD, SEM-EDS, and zeta potential. The synthesized bentonite- APTES adsorbent material was confirmed by FT-IR characterization which gave rise to peaks at wavelengths of 1554 and 1480 cm-1. XRD results show that bentonite is dominantly containing montmorillonite and an increase in d-spacing value after modification. The SEM- EDS results showed a change in the morphology of the material which became coarser and more porous as well as the emergence of new constituent components, namely carbon and nitrogen. The result of zeta potential shows that the material experiences a change in charge from negative to positive after modification. Through a literature review, it was found that the addition of an amine group can increase the capacity and efficiency of the adsorption of Hg(II) ions on the adsorbent material.