Investigation of Adsorption of Cu (II) Heavy Metal with Bentonite

Year 2018, Volume: 7 Issue: 2, 231 - 242, 28.12.2018

Halil Şenol , Ünsal Açıkel

https://doi.org/10.17798/bitlisfen.420210

Cited By: 2

Abstract

In this study, adsorption of undesirable copper (II) ion with bentonite
in industrial wastewater was investigated at different temperature, pH and time
intervals. Adsorption experiments were started with an adsorbent amount of 0.5
grams. Optimum pH determination experiments were carried out in the first stage
of the adsorption experiments. The optimum pH determined after the experiments
was determined as 5.0. Adsorption rates and adsorbed metal ions concentration
increased with increasing concentrations of starting copper (II) ions up to 25
mg / L and 500 mg / L in a medium containing 0.5 g of adsorbent. In the
isotherm studies, isotherms were plotted and isotherm constants were calculated
and it was clearly observed that the adsorption system, Langmuir and Freundlich
isotherms. When the Gibbs free energy (ΔG) values ​​calculated at different
temperatures are taken into consideration, it is observed that the copper (II)
ions have negative values, especially at low concentrations, and thus the
reactions take place spontaneously. The compatibility of the adsorption system
with the Langmuir and Freundlich isotherms was investigated, and it was
observed that the adenomatoid system adhered to Langmuir and Freundlich. Based
on these results, it is concluded that the amount of metal retained on the
surface increases with temperature increase. Values (n> 1) were obtained for
the experiments performed at each concentration of copper (II) ions (up to 500
mg / L at 25 mg / L).

Keywords

Copper (II) ion, Bentonite, Adsorption.

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