Kinetic and Isotherm Modeling of Methylene Blue Adsorption onto Kaolinite Clay at the Solid-Liquid Interface

The utility of kaolinite clay in removing methylene blue from aqueous solution was successfully evaluated. Batch mode adsorption experiments were carried out to study the extraction of methylene blue using kaolinite clay from aqueous phase by optimizing various parameters such as solution pH, contact time, adsorbent dose, and initial methylene blue concentration. Batch studies indicated that the optimum pH range for the adsorptive removal of methylene blue onto kaolinite clay was between 6.0 and 10.0 at 25°C. The equilibrium models such as Freundlich and Langmuir isotherms were tested and later one was found to be the best fit model for describing the adsorption process.