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