Silica-Supported Alginates From Djiboutian Seaweed as Biomass-Derived Materials for Efficient Adsorption of Ni(II)
Résumé
The development of environmentally friendly, reusable and highly performant adsorbent materials for the removal of heavy
metal ions is a big challenge in the field of wastewater treatment. Therefore, in this study, ecofriendly composite materials
based on alginates extracted from Sargassum sp (Alg.S) and Turbunaria (Alg.T) and supported on different silica parti-
cles were prepared and used as adsorbents for Ni(II) ions removal from aqueous solutions. These composites efficiently
extract Ni(II) ions, i.e. the optimal adsorption amount of Ni 2+ reaches 251 mg.g−1 at pH 5 for one composite, surpassing
the adsorption capacities of other adsorbents reported so far in the literature. The kinetic data fit well with a pseudo-second
order model. Furthermore, the adsorption in a binary system containing both Ni(II) and Pb(II) was also studied. The effect
of pH, concentration, and other parameters on the adsorption capacity as well as on kinetics were systematically examined.
These results demonstrate that ours composites show great potential as low-cost bio-adsorbents to remove Ni(II) ions from
aqueous solutions.