KULIT KACANG TANAH (Arachis hypogaea L.) SEBAGAI ADSORBEN Pb(II); PEANUT (Arachis hypogaea L.) SHELL AS Pb(II) ADSORBENT

OKTASARI, ADE, Eko Sugiharto

2016 | Disertasi | FMIPA

An experiment on Pb(II) adsorption using peanut shell without activation (KK), acid-activated (KKA), and base-activated (KKB) has been conducted. Peanut shell powder was activated using H3PO4 1 M and KOH 0,1 M to improve adsorption effectivity and capacity. Adsorbent was characterized using Fourier Transform Infrared spectrophotometer (FT-IR) to identify its functional groups. Adsorption analysis was conducted using batch system at various pH, contact time, and initial concentration of metal ion. The amount of adsorbed Pb(II), calculated from concentration change before and after adsorption, was measured using atomic absorption spectroscopy. Characterization results using FT-IR spectrophotometer showed peak at 3410 and 2924 cm-1 indicated OH dan CH3 aliphatic from framework of cellulose. Optimum condition of Pb(II) adsorption for KK, KKA and KKB was occurred at the same optimum pH, that was pH 5, with contact time 60, 90 and 70 min, respectively. The adsorption kinetic parameter of Pb(II) for KK, KKA, and KKB followed pseudo second order kinetic with rate constants (k) in order of 12.279, 4.149, and 32.258 g mmol-1 min-1, with maximum adsorption capacity based on Langmuir isotherm model of 0.598, 0.505, and 0.622 mmol g-1, and adsorption energy of 26.735, 25.789, and 29.245 kJ mol-1, respectively. The results indicated that KOH-activated peanut has good adsorption affinity for Pb(II) with highest adsorption capacity compared to those without and acid activated.

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