Encapsulation of Activated Carbon Into Calsium Alginate for Adsorption of Pb(II) Ion

• Main Author: Fajrirachma Putri , Irna
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/22622
• Institution: Institut Teknologi Bandung

Water contaminant by heavy metal ions is a significant problem for living things. Pb(II) ion is a toxic heavy metal ion. Adsorption is one method to remove heavy metal ions in water. Alginate is a structural component of alga cell wall that can act as an adsorbent of metal ions. In this research, the adsorbent was prepared by using encapsulation activated carbon in calcium alginate (CaA-KA) to adsorb Pb(II) ions in solution. The characterization of CaA-KA adsorbents was carried out using Fourier Transform Infrared (FTIR) and Scanning Electron Microscopy (SEM). The determination of the optimum conditions of the adsorption process is carried out by varying several parameters, such as adsorbent composition, pH of the solution, mass of the adsorbent, and contact time. The research results showed that the optimum composition was achieved on the ratio of calcium alginate with activated carbon was 4:1 (w/w) with optimum pH of adsorption at pH 4, 0,1 gram adsorbent mass, and 120 minutes contact time. The adsorption process of Pb(II) ion by CaA-KA adsorbent followed Langmuir adsorption isotherm model with a maximum adsorption capacity of 136,99 mg g-1 at 25 °C. The results of kinetic studies showed that the adsorption of Pb(II) ions followed a pseudo second order kinetics model. The adsorption process took place endothermically with the value of ΔGᵒ(25 ˚C) = 9,78 kJ mol-1, ΔGᵒ(40 ˚C) = 7,51 kJ mol-1, Gᵒ(55 ˚C) = 5,23 kJ mol-1, Hᵒ = 54,96 kJ mol-1, and the value of Sᵒ = 1,52x10-1 kJ mol-1K-1.