Physicochemical aspects of using natural scavengers in removing methylene blue (basic dye) from solution |
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Authors: | S M Sirry M E Soltan |
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Institution: |
a Chemistry Department, Faculty of Science, South Valley University, Aswan, Egypt |
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Abstract: | Effluent from dyeing and finishing processes is an important source of water pollution. The effectiveness of bentonite, kaolinite and sediment from a local deposit in removing methylene blue as a cationic dye from aqueous solutions has been investigated. The adsorption equilibrium (isotherm) has been determined according to Freundlich and Langmuir equations. The optimum amount is 0.5 g for all adsorbents, and the optimum pH ranges are 2-8 for bentonite and 2-6 for kaolinite and sediment. With respect to kinetic modelling, the adsorption of methylene blue on various adsorbents was fitted to a second-order equation. Also, the thermodynamic parameters were determined. The negative free energy values indicate the feasibility of the process and spontaneous nature of adsorption. The positive ΔH° values indicate the endothermic nature of the process. Thus, Egyptian clay minerals and sediments have a great tendency to remove the dye from solutions. |
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Keywords: | Kaolinite Bentonite Sediment Methylene blue Adsorption Kinetic and thermodynamic parameters |
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