20.500.12556/DKUM-89851 Thermal study of APTES-functionalized magnetite nanoparticles with citric acid and polyacrylic acid for advanced forward osmosis systems Iron-based magnetic nanoparticles (MNPs) have attracted considerable attention as promising draw solutes in forward osmosis processes due to various advantages. In the present study, magnetite (Fe3O4) nanoparticles (MNPs) with diameters in the range of 12±2 nm were synthesized by applying the coprecipitation method and stabilized using (3-aminopropyl) triethoxysilane (APTES). The amino groups of APTES were further functionalized with various amounts of citric acid (CA) and poly(acrylic acid) (PAA) to achieve higher osmotic pressure. The as-prepared and functionalized nanoparticles were characterized using diferent methods: Fourier-transform infrared spectroscopy (FTIR) confrmed the binding of APTES and CA/PAA on the surface of the MNPs, while the size of the particles was determined by transmission electron microscopy (TEM) and X-ray powder difraction. The isoelectric point, zeta potential, and the particle size in suspension were determined by dynamic light scattering (DLS)/zeta potential measuring system. The amount of free –COOH groups was determined by conductometric titrations. The amount of organic matter (APTES, CA, and PAA) bound on the surface was determined by thermogravimetric analysis (TG), giving results between 7.6% for samples stabilized with APTES only and 17.5% for samples functionalized with APTES+PAA. TG provides a simple and efcient method for determining the amount of organic compounds bound to the surface of MNPs. The osmotic pressure measurements of double-layer coated MNPs provided encouraging results of up to 28 bar, enabling using the samples as draw solutions in an experimental forward osmosis system. magnetic nanoparticles magnetite citrit acid poly(acrylic acid) forward osmosis magnetni nanodelci magnetiti citronska kislina povratna osmoza true false true Springer Link, Akadémiai Kiadó, Kluwer Academic Publishers Angleški jezik Slovenski jezik https://link.springer.com/journal/10973 © The Author(s) 2024 Članek v reviji 2024-08-14 11:53:51 2024-08-14 11:53:53 2025-07-24 03:10:13 0000-00-00 00:00:00 2024 0 0 15 str. let. 149 Published: 15 March 2024 0000-00-00 Zaloznikova Objavljeno NiDoloceno 2023-07-26 2024-02-03 2024-03-15 66.02 189345283 10.1007/s10973-024-12983-2 1588-2926 s10973-024-12983-2.pdf s10973-024-12983-2.pdf 1 15131E9ED7737DF7E6400B80EE92FA2C ddf94e8fc84dd4a9baac75359a328130ee8c8226963b0331b3e14b7fe572f665 8212ea04-67c2-11f0-836a-00155d000105 https://dk.um.si/Dokument.php?lang=slv&id=193997 https://link.springer.com/article/10.1007/s10973-024-12983-2#Ack1 0 8a70d03d-67c2-11f0-836a-00155d000105 https://dk.um.si/Dokument.php?lang=slv&id=193998 Fakulteta za kemijo in kemijsko tehnologijo 0 0 0