Cu(II) ions removal from aqueous solution by synthesized Phragmites australis/emeraldine base biocomposite
In this paper the influence of in situ synthesized biocomposite consisted of Phragmites australis (common reed) and emeraldine base on the removal of copper ions from aqueous media is discussed. Physico-chemical parameters such as initial copper ion concentration, composite dosage and contact time between composites and Cu(II) ions in the water solution were studied. An assessment of the equilibrium and the kinetics of sorption of copper ions has been made. For preparation of the biocomposites two different ratios of common reed/aniline were used. The results show that in all cases were achieved high removal efficiencies. The copper ions removal efficiency increases up to an optimal dose (0.5 g) above which the removal efficiency does not significantly change. Using 0.5 g of Pha/Emb1 and initial copper ions concentration 50 mg L-1 for a period of 360 minutes 99.6 % removal efficiency was achieved, while using the same amount of Pha/Emb2 for the same period of time was obtained 91.9 % removal efficiency. The obtained data were fitted into the isotherms of Langmuir, Freundlich, Temkin and Dubinin-Raduskevich. Applying the Dubinin–Radushkevich model to the experimental data, it was found that the removal of copper ions from the aqueous medium using the synthesized composites is probably due to physical adsorption and ion exchange process. It was found that the Cu(II) adsorption onto used biocomposites followed pseudo second-order kinetics and copper ions were adsorbed onto the Pha/Emb1 and Pha/Emb2 surfaces via chemical interaction.
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