Adsorption of Cadmium (II) onto Thiolated Graphene Oxide and Kinetic Investigations

Document Type : Research Article

Authors

1 Department of environment, Hakim Sabzevari University, Sabzevar, Iran

2 Department of environment sciences, Hakim Sabzevari University, Sabzevar, Iran

3 Department of Chemistry, Payame Noor University (PNU), Kermanshah, Iran

Abstract

Cadmium is a very toxic metal that has adverse effects on human health and aquatic environments even at low concentrations. Therefore, efforts should be made to eliminate this metal from aquatic ecosystems. This study was carried out in order to remove cadmium ions from synthetic aqueous solutions by thiolated graphene oxide in a batch system. In this study, the effect of experimental parameters such as pH, adsorbent dosage and initial cadmium concentration was investigated. To characterize the adsorbent properties, SEM and FT-IR analyses were utilized. The results showed that with the increasing initial concentration of cadmium, the amount of adsorption decreased and increasing the dose of adsorbent and pH increased the percentage of cadmium removal. Comparison of isotherm and kinetic adsorption models showed that Langmuir and Pseudo-second order models, with R2 values of 0.97 and 0.99, respectively, had a better fitting and give a good description of adsorption data than other models. Therefore, as a general conclusion, it can be said that the synthesized adsorbent had a high capability to remove cadmium from aqueous solutions.

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Main Subjects

References

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Amirkabir Journal of Civil Engineering
Volume 52, Issue 1
April 2020
Pages 275-286

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