Removal of Ni(II) and Cd(II) from Their Aqueous by Bio Byproducts of Leaf Base (Petiole) and Fiber of the Date Palm as Low Cost Adsorbents

Abstract

The present study included study of using the agricultural bio byproducts of leaf base (petiole) and fiber of the date palm as low cost adsorbents for removal of Ni(II) and Cd(II) from their aqueous solutions via preparation of activated carbon. The results showed that the adsorption equilibrium time was 40, 30 min. for Ni(II) by leaf and fiber respectively and 30 min for Cd (II) adsorption by both of byproducts. The obtained results indicated that over pH range (6.5–7.0) there is an increased optimum of adsorption for all metal ions. (0.5g) of adsorbent is very ideal to obtain the best adsorption for both studied metals ions . The capacity of the adsorbents to adsorb these metal ions were found to be Ni (II) >Cd (II). The isotherms obeyed Langmuir isotherm better than Freundlich isotherm for both metals. Fiber has the highest removal than petiole. Thermodynamic parameters ( ΔG^o) , (ΔH^o) and (ΔS^o) have been found that the sorption process was feasible, spontaneous and exothermic. Calculated kinetic parameters showed that the pseudo first order model is best fit to the experimental data.