Study of Langmuir and Freundlich Adsorption Isotherms for Heavy Metal Removal from Soil using New Bidentate Schiff base

Author: Nelofer Jamil , Noureen Khan , Rukhsana Jabeen and Ziviqar Sheikh

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Abstract

Soil contamination by heavy metals is one of the most important environmental problem. The restoration and suitable protection of the soil contaminated by heavy metals is consequently required. There are many common techniques which had been used by researchers since long. In the present study newly synthesized Schiff base was used as a adsorbent for physicochemical treatment of soil. Schiff base ligand (SBL) was synthesized from aldehyde and dimer of o-toulidin and then characterized by spectroscopic techniques (UV-Vis, IR spectra and NMR spectroscopy). Results showed the Schiff base was active in adsorbing heavy metals in the sequence as Co>Cu>Zn from the soil. It had been observed that as Greater the concentration greater is the adsorption percentage and same trend was followed by isotherms models (Langmuir and Freundlich) that fits the obtained results as R2 ranges between 95 to 100%.

Keywords

Soil, heavy metals, adsorption, isotherm models.

Conclusion

Present study was based on the estimation of feasibility of Schiff base ligand use as a efficient adsorbent for the removal of Zn(II), Cu(II) and Co(II) from soil suspension/solution. The results were analyzed using two adsorption isotherm models naming as the Freundlich and Langmuir, isotherm models. By using the Langmuir isotherm, the adsorption capacities for Co(II), Zn(II) and Cu(II) are found as 8.5 mg/g, 4.5 mg/g and 4.0 mg/g respectively. The effectiveness of SBL with respect to adsorption of the three metals from soil system was Co(II) > Zn(II) > Cu(II) and this could be explained with reference to ionic radii of the metal ions. The SF (separation parameters) are found to be less than 1 which indicated the SBL is a good adsorbent for Zn, Cu, and Co metal ions. Adsorption studies in batch experiments, there was in increase in the uptake (mg/g) of Zn(II), Cu(II) and Co(II) ions with increase in contact time and concentration. Therefore, study concluded that removal of pollution

References

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How to cite this article

Jamil, N., Khan, N., Jabeen, R. and Sheikh, Z. (2019). Study of Langmuir and Freundlich Adsorption Isotherms for Heavy Metal Removal from Soil using New Bidentate Schiff base. Biological Forum – An International Journal, 11(1): 264-270.