ADSORPTION OF Β-CAROTENE IN ISOPROPYL ALCOHOL WITH DECOLORIZED ACTIVATED CHARCOAL AS MODEL FOR Β-CAROTENE ADSORPTION IN CRUDE PALM OIL
ABSTRACT: This study aimed to
determine porosity properties of decolorized activated charcoal and its ability
to adsorb β-carotene. Ability of activated charcoal for β-carotene adsorption
in isopropyl alcohol determined at equilibrium conditions, were determined by
the duration of adsorption time and activated charcoal concentration.
Equilibrium time was determined from 0.5 to 60 min, concentration of activated
charcoal was determined from 0.5 to 2.5%. Isothermal adsorption determined at
β-carotene concentrations of 100-500 ppm with adsorption temperature of 30, 40
and 50°C at the equilibrium.The results showed that the activated charcoal used
in this study had a Brunauer-Emmett-Teller (BET) surface area of 1068.391 m2/g,
total pore volume of 0.9523 cc/g, mesopore volume of 0.528 cc/g, mesopore
volume/total pore volume as much as 55.4 %, and mesopore radius of 15.26 Å.
Based on content of β-carotene adsorbed into activated charcoal, adsorption
equilibrium was reached after 5 min adsorption. Activated charcoal at a
concentration of 1,5 % able to adsorb β-carotene optimally. Adsorption of
β-carotene at 40°C for 60 min according to Freundlich adsorption model with
coefficient of determination (R2 = 0.999), intensity of adsorption (1/n =
1.0024) and Freundlich adsorption capacity (KF=63.358 L/mg). Whereas adsorption
of β-carotene at 50°C for 60 min according to Langmuir isotherm model with
coefficient of determination (R2 = 0.969), adsorption capacity (b = 33.206
mg/g) and adsorption at equilibrium (Kb = 1.721 L/mg).
Author: Maria Ulfah, Sri
Raharjo, Pudji Hastuti, Purnama Darmadji
Journal Code: jpkimiagg170019
