RHODAMINE B ADSORPTION USING CHITOSAN-CACO3 COMPSITE BEADS ADSORENT

• Main Author: Rizqi Choiriyah, Ainur
• Format: Theses
• Language: Indonesia
• Subjects: Kimia
• Online Access: https://digilib.itb.ac.id/gdl/view/75104
• Institution: Institut Teknologi Bandung

Water is an important component in life, and polluted water will affect living things. Polluted water can disrupt the aquatic ecosystem. This is because polluted water will inhibit the process of photosynthesis because it can make sunlight difficult to enter water. Water pollution can be caused by industrial processes, one of which is the textile industry, which uses synthetic dyes in its production process. The amount of dye used in the textile industry is around 1.3 million tons per year and about 10-25% is removed during the dyeing process. The dyeing process waste water is around 1000-3000 m3 for 12-20 tons of textiles per year. One of the synthetic dyes is Rhodamine B which is toxic and carcinogenic. Polluted water containing dye waste,that can be degraded using the adsorption method. The adsorbent that can be used is chitosan. However, chitosan has a low mechanical properties because it dissolves easily in acid. Therefore, chitosan was modified to improve mechanical properties and increase adsorption capacity. One of the modifications that can be used is crosslinking and composite forming. Based on the research results, before being modified, chitosan was dissolved in 1% (v/v) acetic acid to activate the amine group (-NH2), then the chitosan solution was added to various concentrations of the inorganic compound CaCO3. The chitosan-CaCO3 solution was dripped using a needle into a petri dish containing various concentrations of tripolyphosphate (TPP) crosslinking agent and immersed with time variations. The optimum adsorbent in Rhodamine B adsorption using 20 gram/mL CaCO3, concentration of TPP is 5% (%b/v) and contact time of 3 hours. Adsorbents were characterized using SEM, FTIR, XRD, BET and Zeta Potential. Then the adsorbent was applied in the adsorption of Rhodamine B with variation of pH, contact time, adsorbate concentration, amount of adsorbent and temperature. Based on the research results, the optimum Rhodamine B adsorption at contact time 3 hours with pseudo-second order kinetics with R2 0.9939, optimum pH 4, adsorbate concentration is 50 ppm with Sips adsorption isotherm Qmax 2.8826 mg g-1 and K 0.7325 L mg-1. The higher temperature increases the adsorption capacity with a spontaneous reaction based on a negative Gibbs energy value at a temperature of 300 K, non-spontaneous with a positive Gibbs energy at a temperature of 313 K and 323 K. The adsorption process takes place endothermic based on a positive enthalpy value. The adsorption of Rhodamine B using beads composite chitosan-CaCO3 adsorbents occurred by physisorption because ?G < 20 kJ mol-1.