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. In this study, the adsorption of Ni(II) and Cu(II) ions fromaqueous solutions by powdered Delonix regia pods and leaves was investigated using batchadsorption techniques. The effects of operating conditions such as pH,contact time, adsorbent dosage, metal ion concentration and the presence ofsodium ions interfering with the sorption process were investigated. Theresults obtained showed that equilibrium sorption was attained within 30 min of interaction, and an increase in the initial concentration of theadsorbate, pH and adsorbent dosage led to an increase in the amount of Ni(II)and Cu(II) ions adsorbed. The adsorption process followed thepseudo-second-order kinetic model for all metal ions' sorption. Theequilibrium data fitted well with both the Langmuir and Freundlichisotherms; the monolayer adsorption capacity (Q 0  mg g −1 ) of the Delonix regia pods andleaves was 5.88 and 5.77 mg g −1 for Ni(II) ions respectively and9.12 and 9.01 mg g −1 for Cu(II) ions respectively. The efficiency of thepowdered pods and leaves of Delonix regia with respect to the removal of Ni(II) and Cu(II) ions wasgreater than 80 %, except for the sorption of Ni(II) ions onto the leaves.The desorption study revealed that the percentage of metal ions recoveredfrom 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 beused to remove Ni(II) and Cu(II) ions from aqueous solution.

drinking water engineering and science

Adsorption and desorption studies of &amp;lt;i&amp;gt;Delonix regia&amp;lt;/i&amp;gt; pods and leaves: removal and recovery of Ni(II) and Cu(II) ions from aqueous solution