Fabrication and Application of Nanobeads for Heavy metal ions removal
Volume Title: 1
Authors
1School of Chemical, Petroleum and Gas Engineering, Iran University of Science and Technology, Tehran, Iran
2Departman of Chemistry, Faculty of Science, Tehran University, Tehran, Iran
Abstract
Nanobeads (NB) are microparticles that have high surface area as a novel adsorbent for removal Heavy metals with micro size that made them promising for easily seprating from aquous media. The present study describes the successful fabrication of bio-polymeric nanocomposite bead (NB) of alginate caged magnetic graphene oxide (Alg-MGO). NB was obtained by crosslinking of sodium alginate and calcium ions in in the presence of MGO. Magnetization and formation of micro-sized bead have been successfully developed can be easily separate the adsorbent from large volume of aqueous media without filtration and centrifuge. So using of NB is better than nanoparticles for water treatment due to easily handling. The high capacity factor and the capability of elution of newly synthesized NB made them novel for using as an adsorbent for the enhanced removal and preconcentration of Cu(II) and Pb(II) ions from environmental water samples Actually, the novel absorbent NB can be used in high (1-200 mg L-1) and low (0.33-25.00 µg L-1) concentration due to its capacity. Pseudo-first-order as kinetic model is ascribed that the adsorption of selected metal ions are accumulated on the surface of adsorbent. Finally, thermodynamic model is suggested spontaneous process, endothermic nature and physical sorption mechanism for uptake of selected metal ions. Additionally, preconcentration of Cu(II) and Pb(II) was conducted in the concentration range of 0.33-25.00 µg L-1 with appropriate coefficient of determination (R2=0.99) and low limit of detection (LOD = 0.21-0.71 µg L-1, n=3).
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