Journal
JOURNAL OF MOLECULAR LIQUIDS
Volume 393, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.molliq.2023.123657
Keywords
High abuse; Magnetic nanoadsorbents; Water decontamination; Zolpidem
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This study evaluated the adsorption of zolpidem on magnetic graphene oxide and synthesized magnetic graphene oxide adsorbents for zolpidem removal. The best magnetic nanoadsorbent was found to have a removal percentage of 87.07% at specific pH and temperature conditions. The results suggest that the removal of zolpidem is related to the surface chemistry of the adsorbent rather than the surface area of graphene oxide. The adsorbent showed excellent adsorption efficiency and magnetic behavior, making it a promising material for removing zolpidem from aqueous solutions.
This study evaluated the adsorption of zolpidem (ZPD) on magnetic graphene oxide (GO center dot Fe3O4). The graphene oxide-based magnetic adsorbents used to remove zolpidem were synthesized with different amounts of magnetite. The Adsorbents were characterized, confirming the presence of magnetic nanoparticles on the graphene oxide surface. The best magnetic nanoadsorbent was GO center dot Fe3O41:1, with a removal percentage of 87.07 % at pH 5.0 and 293.15 K. In this sense, zolpidem removal was unrelated to the graphene oxide surface area but to the surface chemistry of the adsorbent. The physical-chemical Interactions between the ZPD molecules and the functional groups of the adsorbent were suggested. ZPD adsorption on GO center dot Fe3O4 1:1 was spontaneous and exothermic. The equilibrium and kinetic studies (Sips and Elovich) suggested adsorption in a heterogeneous surface. Furthermore, the adsorbent presented excellent adsorption efficiency even after many regeneration cycles, and magnetic behavior avoids the centrifugation/filtration steps. Until now, no study in the literature reported removing this harmful and widespread hypnotic drug from water contamination, and GO & sdot;Fe3O4 1:1 was an efficient nanomaterial to remove ZPD from aqueous solutions.
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