Adsorption Isotherm Studies of Co (II) Metal Ion Using Activated Carbon Adsorbent from Lai Durio kutejensis (Hassk) Becc. Immobilized in Clay from East Kalimantan

The stages of the method in this research are the production of fractionated clay, activation of carbon from lai skins and immobilization of Lai Durio kutejensis (Hassk) Becc. in Clay. Then, adsorption of Co (II) metal ions was carried out using activated carbon adsorbents which were immobilized on clay using a batch method using concentration parameters of 5, 15, 30, 50 and 65 mg/L. The concentration of the remaining heavy metal ions was analyzed using Atomic Absorption Spectroscopy (AAS). Optimum percentage of adsorbed metal ions was obtained at a concentration of 50 mg/L for 30 minutes. The adsorption type of Co metal by immobilized adsorbent is Freundlich isothermal because the R value is 0.9009, while the adsorption capacity is 0.00945 mg/g and the adsorption energy is 11.704 kJ/mol so it is classified as a physical adsorption type. Key Word: Adsorption, Activated Carbon, Clay, Lai, Co (II) ------------------------------------------------------------------------------------------------------------------------------------Date of Submission: 12-11-2020 Date of Acceptance: 29-11-2020 -------------------------------------------------------------------------------------------------------------------------------------