Anthracene adsorption and desorption onto organically and inorganically modified sand samples was examined. The sand sample was modified organically via using Dimethyl Ammonium Chloride (DMA) as organic surfactant, while the sand sample was modified inorganically via using Sodium Hydroxide (NaOH) base as inorganic surfactant.
The experimental data showed that the adsorption of anthracene onto both sand samples increased with increase in contact time, and thereafter remained constant at equilibrium when the active sites of the sand samples had been fully utilized.
The inorganically modified sand sample showed a greater adsorption capacity in contrast to that of the organically modified sand sample. This superior adsorption capacity was attributed to the surface area, pore volume (porosity) and the pH value of the inorganically modified sand sample.
Desorption studies was carried out and it was found out that the inorganically modified sand sample desorped more anthracene into the aqueous phase than the organically modified sand sample, this was also attributed to the qualities that factored in the superior adsorptivity of the inorganically modified sand sample.
Kinetic studies were carried out on the sorption data gathered and it was discovered that the pseudo first order kinetics model better described the data with a correlation coefficient of 0.9597 for the inorganically modified sand and 0.9804.
The sorption data for both sand samples were fitted to both Langmuir and Freundlich isotherms and it was discovered that the organically modified sand sample fitted better to the Freundlich adsorption isotherm (R2 = 0.9973), while the inorganically modified sand sample fitted better to the Langmuir adsorption isotherm (R2 = 0.9926).
The mass transfer coefficients for both sand samples were evaluated, and found out to be 0.5551g/l for the inorganically modified sand sample and 0.5016g/l