Assessment of the biosorption kinetic and thermodynamic for the removal of safranin dye from aqueous solutions using calcined mussel shells

다국어 초록 (Multilingual Abstract)

Calcined mussel shells have been used as new low cost and eco-friendly biosorbent for the removal ofsafranin as cationic dye from aqueous solutions by biosorption technique. Batch mode experiments wereconducted using various parameters such as pH, contact time, biosorbent amount and safraninconcentration. Removal efficiency of safranin by the calcined mussel shells attained 87.56% using 200 mgof biosorbent and 150 mg/L as safranin concentration and for a pH above 9.2. Four kinetic models areused, pseudo-first-order, pseudo-second-order, Elovich and intraparticle diffusion for the design and theoptimization treatment. The kinetic analysis showed that the pseudo-second-order model had the bestfit to the experimental data. Biosorption isotherms were also investigated using Langmuir, Freundlichand Temkin models. The experimental data fitted very well with both Langmuir and Freundlich isothermmodels. Thermodynamic biosorption processes were found to be spontaneous, endothermic. The Gibbsenergy DG8 decreased from -1.956 kJ/mol to -2.456 kJ/mol with increase in temperature from 298 K to313 K indicating a increase in feasibility of biosorption at higher temperature. Accordingly, calcinedmussel shells were shown to be a very efficient, eco-friendly and low cost biosorbent and a promisingalternative for removal dyes from aqueous solutions.

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