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Drinking Water Engineering and Science An interactive open-access journal
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https://doi.org/10.5194/dwes-2019-18
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/dwes-2019-18
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: research article 18 Dec 2019

Submitted as: research article | 18 Dec 2019

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A revised version of this preprint was accepted for the journal DWES and is expected to appear here in due course.

Adsorption and Desorption studies of Delonix regiapods and leaves: Removal and recovery of Ni(II) and Cu(II) ions from aqueous solution

Bolanle M. Babalola1, Adegoke O. Babalola2, Cecilia O. Akintayo1, Olushola S. Ayanda1, Sunday F. Abimbade1, and Ekemena O. Oseghe3 Bolanle M. Babalola et al.
  • 1Department of Industrial Chemistry, Federal University Oye-Ekiti, Ekiti State, Nigeria
  • 2Ekiti State Ministry of Works and Infrastructure Ado-Ekiti, Ekiti State, Nigeria
  • 3Nanotechnology and Water Sustainability Research Unit, College of Science, Engineering and Technology, University of South Africa-Science Campus, Florida 1710, South Africa

Abstract. In this study, the adsorption of Ni(II) and Cu(II) ions from aqueous solutions by powdered pods and leaves of Delonix regia was investigated by batch adsorption techniques. The effects of operating conditions such as pH, contact time, metal ions concentration and the presence of sodium ions interfering on the sorption process were investigated. The results obtained showed that the equilibrium sorption was attained within 30 min of interaction and the adsorption process followed the pseudo-second-order kinetic model for all the metal sorption with the exception of Cu(II) sorption on the leaves. The equilibrium data fitted well with both the Langmiur and Freundlich Isotherms; the desorption study revealed that the percentage of metal ions recovered from the pods were higher than the leaves at various concentration of nitric acid. This study has proven that Delonix regia biomass, an agro-waste could be used for removing Ni(II) and Cu(II) ions from wastewater.

Bolanle M. Babalola et al.

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Bolanle M. Babalola et al.

Bolanle M. Babalola et al.

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Short summary
Conventional methods for the removal of metal ions from water are expensive and inadequate. There is the need to look for other methods that are cheaper and easy to handle. Therefore, the use of agricultural waste materials of no economic value is currently gaining wide acceptance. In this study, the pods and leaves of flame of forest tree was ground, examined and used to remove nickel (II) and copper (II) ions from aqueous solutions. Results shows that the agro waste work effectively.
Conventional methods for the removal of metal ions from water are expensive and inadequate....
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