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Abstract. Elimination of the methylene orange which are the main sources of environmental pollution from aqueous media were investigated experimentally by using 0.45 μm hydrophilic nylon membran. Removal of the methylene orange were performed with successfully. Furthermore, repetition effect also was examined rationally. With this study, membrane usage for elimination of the methylene orange are convenient for elimination of them from the aqueous media.

This study was aimed to determine kinetic and thermodynamic behaviors of selenium on modified bentonite and activated carbon. Thermodynamic parameters such as enthalpy ∆H, free energy change ∆G and entropy change ∆S of selenium adsorption suggested that the adsorption of Se(IV) on activated carbon and organicinorganic modified bentonite was exothermic and endothermic process, respectively. The experimental data fitted very well the pseudo-second-order kinetic model for both adsorbents.

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