Rice husk as Biosorbent for the adsorption of methylene blue

Abstract

The ability of rice husk (RH) to adsorb methylene blue (MB) from aqueous solutions has been studied at different initial dye concentrations (10, 20, 30, 40, and 50 mg/L), contact time (10 to 120 mins), pH (2–10) and adsorbent dosage (0.05, 0.1, 0.15, 0.20 and 0.25 g). The MB percentage removal was found to increase with increase in three adsorption parameters studied. Adsorption data were modeled using Langmuir and Freundlich adsorption isotherms with the Freundlich model being the best fit and pseudo-second-order model was the best order that described the kinetics of the MB adsorption process.