PAPER TITLE :UTILIZATION OF DELONIX REGIA PODS AND LEAVES FOR THE REMOVAL OF CO (II) IONS FROM SYNTHETIC WASTEWATER

FUTA JOURNAL OF RESEARCH IN SCIENCE | VOLUME 15 NUMBER 2 2019

Paper Details

  • Author(s) : Babalola B.M.1*, Babalola A.O.2 , Olumayede E.G.1 , Afolabi S.O.1 , Arogundade, I.O.1
  • Abstract:

Delonix regia pods and leaves were engaged as low cost adsorbent for the adsorption of Co (II) ions from aqueous solution. Batch adsorption of Co (II) ions was investigated as a function of some variables such as adsorbate solution pH; contact time of interaction; initial concentration of adsorbate; solution’s ionic strength and adsorbent dosage with the aim of optimising the adsorption process. Experiments were carried out at temperature of 21±2oC; optimum pH of 4 and 6 for the pods and leaves respectively at a contact time of 30 minutes. Data from contact time study followed the pseudo-second order kinetic model while results obtained by varying the concentration of cobalt (II) ions between 1-200 ppm was modelled by the Langmuir and Freundlich isotherms. Both isotherms gave good fit for the adsorption of cobalt (II) ions unto the pods while the Freundlich isotherm provided better fit for Delonix regia leaves. The percentage adsorption recorded for adsorption unto the pods was 67.5% while 24.5% was recorded for sorption of cobalt (II) ions to the leaves. Result from this work showed that Delonix regia pods could be used to remove cobalt (II) ions from wastewater.

Keywords: Delonix regia, Cobalt (II) ions, Langmuir isotherm, Freundlich isotherm, Kinetic models