Abstract:
Fly ash is the result of burning coal in steam generator furnace which is fine and
pozolanic and fly ash is produced in high volume every year. The main components of
coal fly ash are silicate (SiO2), alumina (Al2O3), and iron oxide (Fe2O3). In this study,
fly ash was used as an adsorbent which was activated by chemical activation methods
using NaOH activator with variation of the activator concentration (0, 1, 3 and 5) M and
physical (burning at 600 oC). The results of this study indicate that the optimum
condition of fly ash activator concentration is in 3 M NaOH activator, obtained a
moisture content was 0.35 %, surface area was 46,2791 m2/g and SiO2 content was
60,87 %. Fly ash with the optimum conditions obtained has a maximum adsorption
efficiency of Fe 10 ppm solution was 86,43%. The effectiveness of fly ash in absorbing
Fe ions at various adsorbate concentrations, it was found that the higher adsorbate
concentration would get the greater absorption efficiency by the adsorbent. The
adsorption mechanism of Fe ion in this study follows the Freundlih adsorption isotherm
model.
