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001-es BibID:BIBFORM114314
035-os BibID:(cikkazonosító)13347 (WoS)001061107000001 (Scopus)85170252791
Első szerző:Hajdú Viktória
Cím:Amine Functionalization Leads to Enhanced Performance for Nickel- and Cobalt-Ferrite-Supported Palladium Catalysts in Nitrobenzene Hydrogenation / Viktória Hajdu, Ádám Prekob, Gábor Muránszky, Ferenc Kristály, Lajos Daróczi, Lajos Harasztosi, Zoltán Kaleta, Béla Viskolcz, Miklós Nagy, László Vanyorek
Dátum:2023
ISSN:1422-0067
Megjegyzések:Easy preparation, good yield and easy recovery are the key challenges in the development of industrial catalysts. To meet all these three criteria, we have prepared intelligent, magnetizable NiFe2O4- and CoFe2O4-supported palladium catalysts that can be easily and completely recovered from the reaction medium by magnetic separation. The fast and facile preparation was achieved by a solvothermal method followed by sonochemical-assisted decomposition of the palladium nanoparticles onto the surface of the magnetic nanoparticles. The metal-support interaction was enhanced by amine functionalization of the supports using monoethanolamine. The performance and stability of the non-functionalized and amine-functionalized NiFe2O4- and CoFe2O4-supported palladium catalysts were compared in the industrially important nitrobenzene hydrogenation reaction. All catalysts showed high catalytic activity during aniline synthesis; complete nitrobenzene conversion and high aniline yield (above 97 n/n%) and selectivity (above 98 n/n%) were achieved. However, during reuse tests, the activity of the non-functionalized catalysts decreased, as the palladium was leached from the surface of the support. On the other hand, in the case of their amine-functionalized counterparts, there was no decrease in activity, and a non-significant decrease in palladium content could be measured. Based on these results, it can be concluded that amine functionalization of transition metal ferrites may result in more effective catalysts due to the enhanced metal-carrier interaction between the support and the precious metal.
Tárgyszavak:Természettudományok Fizikai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
hydrogenation
magnetic
stable catalyst
amine functionalized
aniline
Megjelenés:International Journal Of Molecular Sciences. - 24 : 17 (2023), p. 1-15. -
További szerzők:Prekob Ádám Muránszky Gábor Kristály Ferenc Daróczi Lajos (1965-) (fizikus) Harasztosi Lajos (1962-) (villamosmérnök) Kaleta Zoltán Viskolcz Béla Nagy Miklós Vanyorek László
Pályázati támogatás:GINOP-2.1.7-15-2016-00141
GINOP
GINOP-2.3.4-15-2016-00004
GINOP
C1759227
Egyéb
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001-es BibID:BIBFORM117037
035-os BibID:(cikkazonosító)16203 (WoS)001119803600001 (Scopus)85177758034
Első szerző:Ilosvai Ágnes Mária
Cím:Development of Polymer-Encapsulated, Amine-Functionalized Zinc Ferrite Nanoparticles as MRI Contrast Agents / Ágnes M. Ilosvai, LászlóForgách, Noémi Kovács, Fatemeh Heydari, Krisztián Szigeti, Domokos Máthé, Ferenc Kristály, Lajos Daróczi, Zoltán Kaleta, Béla Viskolcz, Miklós Nagy, László Vanyorek
Dátum:2023
ISSN:1422-0067
Megjegyzések:The need for stable and well-defined magnetic nanoparticles is constantly increasing in biomedical applications; however, their preparation remains challenging. We used two different solvothermal methods (12 h reflux and a 4 min microwave, MW) to synthesize amine-functionalized zinc ferrite (ZnFe2O4-NH2) superparamagnetic nanoparticles. The morphological features of the two ferrite samples were the same, but the average particle size was slightly larger in the case of MW activation: 47 +/- 14 nm (Refl.) vs. 63 +/- 20 nm (MW). Phase identification measurements confirmed the exclusive presence of zinc ferrite with virtually the same magnetic properties. The Refl. samples had a zeta potential of -23.8 +/- 4.4 mV, in contrast to the +7.6 +/- 6.8 mV measured for the MW sample. To overcome stability problems in the colloidal phase, the ferrite nanoparticles were embedded in polyvinylpyrrolidone and could be easily redispersed in water. Two PVP-coated zinc ferrite samples were administered (1 mg/mL ZnFe2O4) in X BalbC mice and were compared as contrast agents in magnetic resonance imaging (MRI). After determining the r1/r2 ratio, the samples were compared to other commercially available contrast agents. Consistent with other SPION nanoparticles, our sample exhibits a concentrated presence in the hepatic region of the animals, with comparable biodistribution and pharmacokinetics suspected. Moreover, a small dose of 1.3 mg/body weight kg was found to be sufficient for effective imaging. It should also be noted that no toxic side effects were observed, making ZnFe2O4-NH2 advantageous for pharmaceutical formulations.
Tárgyszavak:Természettudományok Fizikai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
fast microwave synthesis
ferrite
magnetic nanoparticles
MRI
zinc
Megjelenés:International Journal Of Molecular Sciences. - 24 : 22 (2023), p. 1-8. -
További szerzők:Forgách László Kovács Noémi Heydari, Fatemeh Szigeti Krisztián Máthé Domokos Kristály Ferenc Daróczi Lajos (1965-) (fizikus) Kaleta Zoltán Viskolcz Béla Nagy Miklós Vanyorek László
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DOI
Intézményi repozitóriumban (DEA) tárolt változat
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