ERIOCHROME BLUE BLACK MODIFIED CARBON OF PAPAYA SEED AS ADSORBEN FOR REMOVAL PB (II) IONS FROM AQUEOUS SOLUTION

• Main Author: Wigati, Widya
• Format: Final Project
• Language: Indonesia
• Subjects: Kimia
• Online Access: https://digilib.itb.ac.id/gdl/view/33905
• Institution: Institut Teknologi Bandung

In this study, activated carbon (AC) and activated carbon modified with Eriochrome Blue Black (AC-EBB) were succesfully prepared for adsorption of Pb (II) ion from aqueous solution. The preparation of both adsorbent was carried out using papaya seed as a raw materials. The prepared both adsorbents were characterized by Fourier Transform Infrared (FTIR) and Scanning Eelectron Microscope (SEM) analysis. Then, the adsorption experiments were carried out to investigate the effect of different adsorption parameters such as contact time, initial concentration, pH, adsorbent dossage and temperatur in a Batch system. The effects of EBB concentration and other divalent metal cations including Cu (II) and Zn (II) on Pb (II) adsorption also investigated. Two isoterm models namely Langmuir and Freundlich were applied to describe the equilibrium data of Pb (II) ion. The kinetic data of Pb (II) ion was analyzed by pesudo-first-order and pseudo-second-order kintetic models. The experiment results showed that for both adsorbents, the equilibrium contact time was 30 minute and the adsorption capacity increases with increasing solution pH from 2 to 5 and relative constant at pH > 5. The experimental results showed that the adsorption capacity increases with an increase in initial concentration of Pb (II) ion and temperature and it decreases with an increase in the adsorbent dossage for both adsorbents. The equilibrium data fitted well for the Langmuir adsorption isotherm for both adsorbents, with the maximum adsorption capacity were 135, 74 mg/g and 33,54 mg/g for AC and AC-EBB, respectively. The results of the kinetic study show that the adsorption of Pb (II) ion onto both adsorbents could be described by pseudo- second-order kinetic model. Thermodynamic parameter data indicated that under the experimental conditions, the adsorption process in both adsorbents were spontaneous with the Gibbs free energy (?G) are -0,381 kJ/mol at 25oC and -5,144 kJ/mol at 45oC for AC and 0,165 kJ/mol at 25o as well of -1,425 kJ/mol for AC-EBB, respectively. The adsorption process was endothermic for both adsorbents, with the enthalpy (?H) are 70,583 kJ/mol and 23,860 kJ/mol, where as entropy (?S) are 238,139 J/K.mol and 79,513 J/K.mol for AC and AC-EBB, respectively.