ADSORPSI ION MN(II) MENGGUNAKAN BIOSORBEN BULIR ?-KARAGENAN MN(II) ION ADSORPTION USING ?-CARRAGEENAN BEADS AS A BIOSORBENT

• Main Author: Chairurrizky, Syifabudi
• Format: Final Project
• Language: Indonesia
• Subjects: Kimia
• Online Access: https://digilib.itb.ac.id/gdl/view/65263
• Institution: Institut Teknologi Bandung

Carrageenan is a polysaccharide consisting of d-galactose linked alternately with ?-1,4-glycosidic and ?-3,6-glycosidic bond. This polysaccharide can be found in red algae and has an anionic surface in contribution of the ester sulfate group that attached onto one of its carbon. The anionic properties of ?-Carrageenan made this biopolymer as a potential adsorbent for heavy metal adsorption, i.e. Mn(II) ion, which is one of the toxic water contaminant in a huge amount. This research focuses on the performance of ?-Carrageenan beads in the adsorption of Mn(II) in any conditions. ?-Carrageenan beads are successfully made using a standard grade ?-Carrageenan powder in 2.5% w/v. ?-Carrageenan beads were characterized using Fourier Transform Infrared (FTIR) spectroscopy and swelling degree. FTIR characterization shows the fingerprint bands of ?-Carrageenan in powder form, beads form and beads after contact. ?-Carrageenan beads that were made have a swelling degree of 8.08. Adsorption of Mn(II) by ?-Carrageenan beads performance was observed in various condition using flame atomic absorption spectroscopy (FAAS) by determining the concentration of Mn(II) ion before and after the adsorption. Optimized conditions were obtained in pH 3 with the initial concentration of Mn(II) ion at 100 mg L-1 and the adsorbent mass is 0.1 gram with a contact time of 120 minutes. Mn(II) ion adsorption using ?-Carrageenan follows the Langmuir model of adsorption isotherm with the R2 value of 0.9905. Mn(II) ion adsorption using ?-Carrageenan follows the pseudo-second order kinetics with the R2 value of 0.9982. The thermodynamics of the adsorption of Mn(II) ions using ?-Carrageenan showed that the adsorption was non-spontaneous and endothermic shown in the values of each ?G are 11.23 (298 K), 10.79 (308 K), 10.22 (318 K) kJ mol-1 also the value of each ?H and ?S is, 26.26 kJ mol-1 and 50.42 J K-1 mol-1 respectively.