Removal of basic dye methylene blue by using bioabsorbents <i>Ulva lactuca</i> and <i>Sargassum</i>

Abstract

In the present study, the removal of textile dye methylene blue was studied by adsorption technique using adsorbents such as, alumina, Ulva lactuca and Sargassum (Maine algae). The batch technique
was adopted under the optimize condition of amount of adsorbent, stay time, concentration, temperature and pH. By using uv spectrophotometer, concentration of dye was measured before and after adsorption. The removal data were fitted into the Langmuir and Freundlich adsorption isotherm equations. The values of their corresponding constants were determined. Thermodynamic parameters like free energy (G), enthalpy (H) and entropy (S) of the systems were calculated by using Langmuir
constant (K). The values of % removal and KD for dye systems were calculated at different temperatures ranging (303 - 318 K) with the intervals of 5 ± 2°C. The present study shows that about 96% removal of
dye was obtained by using biosorbents.