High-efficient scavenging of U(VI) by magnetic Fe3O4@gelatin composite

Adsorption of Cu(II) and Zn(II) Ions from Aqueous Solution by Gel/PVA-Modified Super-Paramagnetic Iron Oxide Nanoparticles

“…The Fe–O bond stretching at 566–575 cm −1 can be found in all samples [ 25 , 26 ]. Gelatin has functional groups such as –OH and –NH groups (between 3200–3500 cm −1 ), –CH 2 group (asymmetric C–H stretching vibration 2946 cm −1 and symmetric C–H stretching vibration 2870 cm −1 ), amide group (1648 cm −1 and 1534 cm −1 ) [ 14 , 16 , 27 ]. PVA has functional groups such as –OH group (3200–3500 cm −1 ), –CH 2 groups (2866 cm −1 ), C–O–C groups (1090 cm −1 stretching vibration) [ 6 , 7 , 28 ].…”

“…This results are consistent with the TGA results of the nanoparticles. It is clear that SPIONs/gel and SPIONs/gel/PVA samples can be easily separated from aqueous solution by applying an external magnetic field [ 14 , 30 ].…”

“…Gelatin is a natural water-soluble biopolymer with a variety of advantages such as environmental friendliness, biodegradability, biocompatibility, and low cost. It is feasible to use gelatin as an adsorbent material for various ionic species because of its abundant –OH, –NH 2 , and –COOH groups [ 14 , 15 ]. Therefore, gelatin coated on the surfaces of magnetic nanoparticles could enhance their adsorption capacity for heavy metal ions through the reactivity of its own functional groups [ 16 , 17 , 18 ].…”

“…Therefore, gelatin coated on the surfaces of magnetic nanoparticles could enhance their adsorption capacity for heavy metal ions through the reactivity of its own functional groups [ 16 , 17 , 18 ]. Magnetic nanoparticles modified by gelatin have been reported in use for scavenging U(VI) under a series of environmental conditions [ 14 ]. However, the drawbacks of gelatin include its poor mechanical properties and rapid degradation in wet conditions [ 19 , 20 , 21 ].…”

Immobilized Gelatin–λ–Carrageenan on Magnetite Nanoparticles as an Efficient Organocatalyst for Enantioselective Biginelli Reaction

“…The IR spectrum of gelatin (a2) had characteristic peaks at 1537 cm −1 (C=N stretching) and 1670 cm −1 for the C=O stretching of amid I . Moreover, C–H stretching vibrations were observed at 2860 and 2931 cm −1 , and the broad band of H–bonded O–H and N–H stretching vibrations was observed at 3200–3600 cm −1 region . After the modification of Fe 3 O 4 NPs with gelatin (GM, spectrum a3), the amide I is shifted to 1634 cm −1 .…”