20.500.12556/DKUM-85027 Synthesis of magnetic nanoparticles with covalently bonded polyacrylic acid for use as forward osmosis draw agents Multicoated magnetite (Fe3O4) magnetic nanoparticles (MNPs) with polyacrylic acid (PAA) as a terminal hydrophilic ligand were synthesized and examined for use as a draw solution (DS) agent in forward osmosis (FO). After coating superparamagnetic iron-oxide MNPs with (3-aminopropyl)triethoxysilane (APTES) the carboxyl groups of PAA were bound to APTES amino groups via the crosslinker 1-ethyl-3-(3-dimethylaminopropyl)-carbodiimide (EDC) forming a peptide bond resulting in stable water-soluble particles (MNP@APTES@PAA) with a concentration-normalised osmotic pressure of 1.56 bar L g−1. The MNP@APTES@PAA solution was evaluated as a DS in two FO filtrations with deionized (DI) water as a feed solution (FS): one using freshly prepared MNP@APTES@PAA and one using magnetically recovered (re-concentrated) MNP@APTES@PAA. The resulting MNP@APTES@PAA nanocomposites exhibit good colloidal stability in aqueous solution with a concentration-normalized osmotic pressure of 1.56 bar L g−1. This is 12-fold higher than that in our previous studies of poly-sodium-acrylate coated MNPs and 3-fold higher than that of citric acid coated MNPs. The water recoveries of the two filtrations were 25.7% and 13.6%, respectively, after 2 h of FO filtration time resulting in a DS osmotic pressure of 2.5 bar with a concentration of 4.3 g L−1 and a DS osmotic pressure of 2.6 with a concentration of 3.7 g L−1 respectively. magnetic nanoparticle forward osmosis draw solution osmose osmoza magnetni nanodelci sinteza true false true Royal Society of Chemistry Angleški jezik Slovenski jezik https://www.rsc.org/ Članek v reviji 2023-08-16 13:26:05 2023-08-16 13:26:05 2024-04-19 13:48:32 0000-00-00 00:00:00 2023 0 0 str. 442-453 Vol. 9 2023 0000-00-00 Zaloznikova Objavljeno NiDoloceno 2022-07-13 2022-11-24 2023-11-28 620.3 132088835 10.1039/D2EW00539E 2053-1419 Synthesis_of_magnetic_nanoparticles_w-Ban-2023.pdf Synthesis_of_magnetic_nanoparticles_w-Ban-2023.pdf 1 E4485A6D90D2D7D09B13F6A48B25AAF3 95f47e7867244382ac1dec4dd292a72c0a7fbc9d0db1d75e5f70084cbcc0b6e7 445feea0-3c28-11ee-b5e9-00155d000105 https://dk.um.si/Dokument.php?lang=slv&id=169573 https://pubs.rsc.org/en/content/articlelanding/2023/EW/D2EW00539E 0 4b9935c0-3c28-11ee-b5e9-00155d000105 https://dk.um.si/Dokument.php?lang=slv&id=169574 Fakulteta za kemijo in kemijsko tehnologijo 0 0 0