The macroalga
Caulerpa lentillifera
was found to have adsorption capacity for a basic dye, Astrazon Blue FGRL. For the whole range of
concentrations employed in this work (20–1280 mg l
K
1
), the adsorption reached equilibrium within the first hour. The kinetic data
corresponded well with the pseudo second-order kinetic model where the rate constants decreased as initial dye concentrations increased. At
low dye concentrations (20–80 mg l
K
1
), an increase in the adsorbent dosage resulted in a higher removal percentage of the dye, but a lower
amount of dye adsorbed per unit mass (
q
). The adsorption isotherm followed both the Langmuir and Freundlich models within the
temperature range employed in this work (18–70
8
C). The highest maximum adsorption capacity (
q
m
) was obtained at 50
8
C. The enthalpy of
adsorption was estimated at 14.87 kJ mol
K
1
suggesting a chemical adsorption mechanism.
q
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