Abstract
In this work, the selective adsorption and preconcentration of methylene blue dye from aqueous solution by using a strong acid cation exchanger (Purolite® SST60) was studied in a batch adsorption and column system. The removal of MB was found to be pH dependent and the highest adsorption capacity was observed at pH 8.5. The observed adsorption rate was relatively fast and the equilibrium was established within 30–60min. The obtained adsorption data were treated with the different adsorption isotherms. The maximum adsorption capacities obtained from the Langmuir model was 113mgg−1, 131mgg−1, 155mgg−1, 199mgg−1, 262mgg−1 at 288, 293, 298, 303 and 308K, respectively. Furthermore, the adsorption process was found to follow the pseudo-second-order kinetic model. The intraparticle diffusion study revealed that film diffusion might be involved in the present case. Thermodynamic parameters revealed the feasibility, spontaneity and endothermic nature of adsorption. The sorbents were successfully regenerated using 50:50 mixture of 2M HCl + 75% methanol mixture solutions.
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