CEJ 203-2012-9

Modified oil palm leaves adsorbent with enhanced hydrophobicity for crude
oil removal

The removal of crude oil from water by lauric acid (LA) modified oil palm leaves (OPLsLA) was investigated
by batch adsorption after varying pH (2–11), contact time (10–60 min), adsorbent dosage (0–52 g L1),
initial oil concentration (0–6400 mg L1) and temperature (303–323 K). The modification significantly
increased the hydrophobicity of the adsorbent, thus creating OPLLA with much better adsorption capacity
for crude oil removal. The results gave the maximum adsorption capacity of 1176 ± 12.92 mg g1 at
303 K. The significant uptake of crude oil from water was proven by FT-IR and FE-SEM analyses. The isotherms
studies revealed that the experimental data agrees with the Freundlich isotherm model. The
pseudo-second-order kinetics model fitted well the experimental results. Boyd’s and Reichenberg’s equation
on adsorption dynamic revealed that the adsorption was controlled by internal transport mechanism
and film-diffusion was the major mode of adsorption. The prepared adsorbent showed the potential to
use as a low-cost adsorbent in oil-spill clean-up.