Adsorption and desorption studies of <i>Delonix regia</i> pods and leaves: removal and recovery of Ni(II) and Cu(II) ions from aqueous solution
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Published:2020-07-17
Issue:2
Volume:13
Page:15-27
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ISSN:1996-9465
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Container-title:Drinking Water Engineering and Science
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language:en
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Short-container-title:Drink. Water Eng. Sci.
Author:
Babalola Bolanle M., Babalola Adegoke O., Akintayo Cecilia O., Lawal Olayide S., Abimbade Sunday F.ORCID, Oseghe Ekemena O., Akinola Lukman S., Ayanda Olushola S.
Abstract
Abstract. In this study, the adsorption of Ni(II) and Cu(II) ions from
aqueous solutions by powdered Delonix regia pods and leaves was investigated using batch
adsorption techniques. The effects of operating conditions such as pH,
contact time, adsorbent dosage, metal ion concentration and the presence of
sodium ions interfering with the sorption process were investigated. The
results obtained showed that equilibrium sorption was attained within 30 min of interaction, and an increase in the initial concentration of the
adsorbate, pH and adsorbent dosage led to an increase in the amount of Ni(II)
and Cu(II) ions adsorbed. The adsorption process followed the
pseudo-second-order kinetic model for all metal ions' sorption. The
equilibrium data fitted well with both the Langmuir and Freundlich
isotherms; the monolayer adsorption capacity (Q0 mg g−1) of the Delonix regia pods and
leaves was 5.88 and 5.77 mg g−1 for Ni(II) ions respectively and
9.12 and 9.01 mg g−1 for Cu(II) ions respectively. The efficiency of the
powdered pods and leaves of Delonix regia with respect to the removal of Ni(II) and Cu(II) ions was
greater than 80 %, except for the sorption of Ni(II) ions onto the leaves.
The desorption study revealed that the percentage of metal ions recovered
from the pods was higher than that recovered from the leaves at various nitric acid concentrations. This study proves that Delonix regia biomass, an agricultural waste product (“agro-waste”), could be
used to remove Ni(II) and Cu(II) ions from aqueous solution.
Publisher
Copernicus GmbH
Subject
Pollution,Water Science and Technology,Civil and Structural Engineering
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