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In this study, the removal of methylene blue from aqueous solutions by biosorption onto Elaeagnus angustifolia stone has investigated. Optimum biosorption conditions have determined as a function of pH, biosorbent dosage, initial methylene blue concentration, contact time and temperature of the solution for the removal of methylene blue. Langmuir, Freundlich and Dubinin-Radushkevich (D-R) isotherm models have used to describe the biosorption isotherm model. The experimental data have fitted to pseudo-first order, pseudo-second order and intraparticle diffusion model to examine the sorption kinetics. The values of ΔG°, ΔH° and ΔS° have calculated by thermodynamic study to determine the nature of biosorption process. Experimental results have shown that Elaeagnus angustifolia stone can be used as an effective and low cost biosorbent precursor for the removal of methylene blue from aqueous solutions.

Elaeagnus angustifolia STONE AS A LOW-COST BIOSORBENT PRECURSOR FOR REMOVAL OF METHYLENE BLUE FROM AQUEOUS SOLUTION