Adsorption of Methylene Blue Onto Macroalgae Biomass: Equilibriums and Kinetics Study

In the present study, removal of methylene blue (MB) through adsorption using macroalgae as alternative adsorbent to activated carbon was conducted. The influences of various experimental parameters were investigated, such as macroalgae species, initial MB concentration (50-250 mg/L), the dosage of adsorbent (0.5-1.5 g) and solution pH (3.5-7.5). Macroalgae Undaria pinnatifida attained the highest MB removal efficiency of 98.31 under the following conditions: 250 mg/L of initial MB concentration, 0.5 g of macroalgae biomass dosage and pH medium of 7.5. In addition, adsorption of MB using Undaria pinnatifida biomass was found to fit well with Langmuir isotherm, which indicated homogeneous adsorption was taking place in the process. Besides, the adsorption model in this study also followed the pseudo-second-order kinetic model. The outcomes of this study evidenced the feasibility of macroalgae as an alternative adsorbent for MB removal from the aqueous solution. © 2021 by Nova Science Publishers, Inc.