Adsorption of methylene blue onto papaya leaves: comparison of linear and nonlinear isotherm analysis

摘要

The use of low-cost adsorbent papaya leaf was investigated as a replacement for current costly methods of removing methylene blue dye (MB) from the aqueous solution. The adsorption equilibrium was determined as a function of contact time, initial adsorbate concentration, and solution pH. The adsorptive uptake of MB increased with increasing the initial MB concentration and solution pH. The adsorption isotherms were correlated with a comparison of linear and nonlinear regression analysis. Langmuir isotherm model provided the best-fit for the adsorption of MB onto papaya leaf, with a maximum monolayer adsorption capacity of 231.65mg/g. This locally available adsorbent was found to be low cost and promising for the remediation of textile wastewater.