ADSORPTION OF INDIGOSOL YELLOW DYE USING COMMERCIAL CHITOSAN PREPARED FROM SHRIMP SHELL WASTE AND MODIFIED SHRIMP SHELL WASTE

• Main Author: Fitria, Nadia
• Format: Theses
• Language: Indonesia
• Subjects: Teknik saniter dan perkotaan; teknik perlindungan lingkungan
• Online Access: https://digilib.itb.ac.id/gdl/view/32094
• Institution: Institut Teknologi Bandung

This batch adsorption study aimed to compare the adsorption of indigosol yellow dye using chitosan and acid-treated shrimp shell waste. This batch experiment consists of the experiments on the effect of pH, adsorbent dose, contact time and initial dye concentration to the color removal efficiency. From the study of the effect of pH, it was found that color removal best occurred at low pH which is 3, while for the effect of adsorbent dose, it was found that the color removal efficiency is directly proportional to adsorbent dose. Equilibrium time for both adsorbents were achieved on the same time which is at 360 minutes or 6 hours. Equilibrium data were fitted to the Langmuir, Freundlich and Dubinin Radushkevich (D-R) isotherm equations and the equilibrium data were found to be best well represented by the Langmuir isotherm equation rather than two others isotherms used. The compatibility of the experimental data with the Langmuir isotherm model indicates that the adsorption process takes place physically in the form of a single layer (monolayer). The maximum adsorption capacity of chitosan and modified shrimp shell waste for indigosol yellow adsorption was found to be 169.49 mg/g and 33.90 mg/g respectively. RL numbers were in the range of 0-1 explain that the adsorption process is favorable. The adsorption data were analyzed using pseudo-first-order, pseudosecond- order and intraparticle diffusion kinetic models and the adsorption kinetics was found to follow a pseudo-second-order kinetic model for both adsorbents, therefore for the whole adsorption process, chemisorption might be the rate-limiting step that controls these adsorption processes. The adsorption mechanism of indigosol yellow dye onto chitosan is the electrostatic interaction between the sufonate group R-SO3 - from the dye with the NH3 + which protonated amine group NH2 of chitosan.