Uranium adsorption by polyvinylpyrrolidone/chitosan blended nanofibers

Superparamagnetic polyvinylpyrrolidone/chitosan/Fe3O4 electrospun nanofibers as effective U(VI) adsorbents

“…The thermal crosslinking of the as‐prepared PVP/CS electrospun fibrous membranes was carried out in three steps 50,59 : first heating step (80–100°C): 80°C for 15 min, 90°C for 60 min and 100°C for 45 min. Second heating step (130–160°C): 130°C for 60 min and 160°C for 120 min.…”

“…Moreover, very recently we have prepared polyvinylpyrrolidone/chitosan blended polymer nanofibers and evaluated their performance as adsorbents for hexavalent uranium (U(VI)) from aqueous solutions. The increased adsorption capacity ( q max = [167 ± 25] g kg −1 at pH 6.0) was attributed to the presence of polar moieties onto the fibers' surfaces resulting to an enhancement in their chemical affinity for U(VI) 50 …”

“…The selection of PVP was based on its cost‐effectiveness, biocompatibility and hydrophilicity, with the latter enabling the generation of PVP/CS/OA.OA.Fe 3 O 4 adsorbents exhibiting good wettability in aqueous media. Moreover, the use of PVP assists the electrospinnability of chitosan 50 while the presence of the amide groups in the pyrrolidone rings found within its structure provides additional binding sites, resulting to the enhancement of the fibers' adsorption capacity 52–54 . In addition, PVP can be subjected to thermal crosslinking by following a simple thermal treatment process, thus enabling the generation of water insoluble (but still wettable) nanofibrous membrane adsorbents.…”

Chitosan Derivatives and Their Application in Biomedicine

“…Chemical modification can not only improve the physical and chemical properties of chitosan, it can also retain the unique properties of chitosan and expand the application range of chitosan derivatives. Modified chitosan derivatives have better biocompatibility, bioactivity, anticancer, and antiviral pharmacological effects, including the ability to induce erythrocyte aggregation, promote platelet activation, and activate complement systems other than that of chitosan [8][9][10][11][12][13]. At present, chitosan derivatives have been widely used in both medical materials and biomedicine.…”

Preparation of Chitosan Stacking Membranes for Adsorption of Copper Ions

“…CS molecular chains have a great quantity of amino and hydroxyl functional groups which can generate the complexes by cooperating with heavy metal ions [20]. In current research, an effective way to obtain CS-based adsorbents is described, i.e., by improving the specific surface area and adsorption performance via the subtle design of the adsorbent morphology [21,22,23,24,25,26].…”