Browsing by Author "Milenia, Faradilla"
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Item BIOSORBEN BUAH JABON PUTIH (Anthocephalus cadamba Miq.) UNTUK PENJERAPAN ION LOGAM MERKURI(II)(Elfitra, 2022-12) Milenia, Faradilla; Hanifah, T. AbuThis study aims to determine the efficiency and biosorption capacity of biosorbents in adsorbing mercury(II), determine the kinetics model and biosorption isotherms and the ability to regenerate biosorbent in white jabon fruit. Optimization of the biosorbent powder was carried out on the parameters of pH, contact time and adsorbate concentration. The biosorbent is then regenerated by desorption using HCl solution. The results of the physical and chemical characterization in this study showed a moisture content of 8.09%, ash content of 1.32%, adsorption capacity of iodine 753.5812 mg/g and adsorption capacity of methylene blue 24.8632 mg/g with a surface area of 92.1764 m2/g. Results The pHpzc value for the Jabon fruit biosorbent powder was 5.5 which indicated that the biosorbent powder had a negative charge. The results of the biosorption test showed that the optimum condition of the biosorbent powder was at a variation of pH 6, contact time and at an initial concentration of 80 mg/L with a biosorption efficiency of 99.91% and a biosorption capacity of 3.5761 mg/g. Based on the FTIR results of aliphatic C-H functional groups, aromatic C-H, C=O, C-O-C, O-Hg and N-H. Based on the results of the BET analysis, the biosorbent powder had a surface area before biosorption of 3.53039 m2/g, after biosorption of 0 m2/g and after resorption of 0.17056 m2/g. Based on the results of the SEM-EDS, it was found that the jabon fruit biosorbent powder had the elements O, C, Na, N, Cl, K, Hg and had an uneven texture and the distance between the particles looked very tight and had a small grain size. The surface texture looks very smooth. In this study, the percentage of regeneration was 98.34%. Biosorption kinetics follows the second-order pseudo-equation where the equation is y = 0.2097x – 0.0075 with R2 = 1 and K = 5.86339 gmg-1min-1, assuming a chemical adsorption process that includes inter-valence forces or electron exchange between the adsorbent and the adsorbate and the biosorption isotherm model follows the Langmuir equation with the equation y = 0.019x + 0.0153 with R2 = 0.9665, it is assumed that the active site on the surface of the adsorbent is homogeneous.