20.500.12556/DKUM-94172 Magnetic separation of oil spills from water using cobalt ferrite nanoparticles with fluorocarbon functionalization In the present study, we synthesized fluorocarbon-coated cobalt ferrite (CoFe2O4) magnetic nanoparticles using alkoxysilanes such as trimethoxy(3,3,3-trifluoropropyl)silane (TFPTMS), trimethoxy(1H,1H,2H,2H-nonafluorohexyl)silane (NFHTMS), and triethoxy(1H,1H,2H,2H-perfluorodecyl)silane (PFDTES). The synthesized nanoparticles were characterized by various techniques, including X-ray diffractometry (XRD), transmission electron microscopy (TEM/HRTEM/EDXS), Fourier transform infrared spectroscopy (FTIR), specific surface area measurements (BET), and magnetometry (VSM). To understand their surface characteristics, contact angle (CA) measurements were carried out, providing valuable insights into their hydrophobic properties. Among the samples of CoFe2O4 coated with fluoroalkoxysilanes, those with PFDTES surface coating had the highest water contact angle of 159.2°, indicating their superhydrophobic character. The potential of the prepared fluoroalkoxysilane-coated CoFe2O4 nanoparticles for the removal of waste low-SAPS synthetic engine oil from a model aqueous solution was evaluated based on three key parameters: adsorption efficiency (%), adsorption capacity (mg/g), and desorption efficiency (%). All synthesized CoFe2O4 samples coated with fluoroalkoxysilane showed high oil adsorption efficiency, ranging from 87% to 98%. The average oil adsorption capacity for the samples was as follows: F3-SiO2@CoFe2O4 (3.1 g of oil/g of adsorbent) > F9-SiO2@CoFe2O4 (2.7 g of oil/g of adsorbent) > F17-SiO2@CoFe2O4 (1.5 g of oil/g of adsorbent) as a result of increasing oleophobicity with increasing fluorocarbon chain length. The desorption results, which showed 77–97% oil recovery, highlighted the possibility of reusing the adsorbents in multiple adsorption/desorption cycles. cobalt ferrite spinel fluorocarbons oil spill adsorption hydrophobicity oleophobicity water remediation kobaltov ferit fluoroogljiki razlitje nafte adsorpcija hidrofobnost oleofobnost sanacija vode true false true MDPI Angleški jezik Slovenski jezik https://www.mdpi.com/1422-0067/26/14/6562 Članek v reviji 2025-08-06 14:34:01 2025-08-06 14:34:01 2025-08-07 03:09:17 0000-00-00 00:00:00 2025 0 0 35 str. iss. 14, [article no.] 6562 Vol. 26 July 2025 0000-00-00 Zaloznikova Objavljeno NiDoloceno 2025-04-14 2025-06-30 2025-07-08 628.3:620.3 242314755 10.3390/ijms26146562 1422-0067 ijms-26-06562.pdf ijms-26-06562.pdf 1 2CD8F0438C60BF77003EDC6B977EBE8C cccd0d506863de68d313944a30bc9278b959e1fd21b64cb40e59a89d51e65ffa f5d5f658-72c1-11f0-81cc-00155d000105 https://dk.um.si/Dokument.php?lang=slv&id=194863 https://www.mdpi.com/1422-0067/26/14/6562 0 fd743532-72c1-11f0-81cc-00155d000105 https://dk.um.si/Dokument.php?lang=slv&id=194864 Fakulteta za strojništvo 0 0 0