INVESTIGATION OF CATALYTIC BEHAVIOUR OF WO3 DOPED MAGNETIC DENDRIMERS

Year 2022, , 229 - 242, 31.12.2022

Nurdan Kurnaz Yetim , Elvan Hasanoğlu Özkan , Mümin Mehmet Koç

https://doi.org/10.34186/klujes.1187397

Cited By: 2

Abstract

In this work, WO3 nanoparticle decorated nanoparticle decorated magnetic poliamidoamin (PAMAM) dendrimer nanocomposites were fabricated and used as a catalyser for the reduction of 4-nitrophenol (4-NP). Fe3O4 superparamagnetic iron oxide nanoparticles were used as magnetic core. Magnetic iron oxide nanoparticles were produced using hydrothermal synthesis. Magnetic nanoparticle core was covered with PAMAM dendrimers. The dendrimers used in the covering process was 2nd generation dendrimers which proposed to protect nanoparticles from losing their magnetic characteristics. PAMAM coated core@shell structure was decorated with WO3 nanoparticles where Fe3O4@G2/WO3 magnetic dendrimer composites were obtained. Structural characterization of magnetic dendrimers was performed using microscopic, spectroscopic and crystallographic methods where SEM, TEM, EDX, XRD methods were used. Vibrating sample magnetometry was used in the assessment of magnetic characteristics. Caraltytic performance of the magnetic dendrimers were tracked using UV-vis spectroscopy. Magnetic dendrimers were used for the reduction on 4-NP. Reaction rate coefficient kapp was calculated and found as 4x10-3 s-1.

Keywords

Fe3O4 Nanoparticles, Magnetic Dendrimers, WO3 Nanoparticles, 4-Nitrophenol

Supporting Institution

Kırklareli University Scientific Research Projects Coordination Unit

Project Number

KLÜBAP 236 and KLÜBAP 229

WO3 Katkılı Manyetik Dendrimerlerin Katalitik Davranışlarının İncelenmesi

Abstract

Bu çalışmada, WO3 nanoparçacıklar ile dekore edilmiş manyetik poliamidoamin (PAMAM) dendrimerler üretildi ve 4-nitrofenolün indirgenmesi işleminde kullanıldı. Bunun için Fe3O4 süperparamanyetik demir oksit nanoparçacıklar manyetik çekirdek olarka üretildi. Üretimde hidrotermal metot kullanıldı. Manyetik çekirdeğin manyetik özelliğinin kaybolaması için ikinci jenerasyon PAMAM dendrimerler ile kaplandı. PAMAM kaplı çekirdek@kabuk yapı WO3 nanoparçacıklar ile dekore edildi ve Fe3O4@2G/WO3 manyetik dendrimer nanokompozitler elde dilmiş oldu. Elde edilen yapıların yapısal özellikleri SEM, TEM, EDX, XRD gibi mikroskobik, spektroskopik ve kristalografik metotlar ile incelendi. Manyetik özellikler titreşimli numune magnetometresi ile incelenirken katalitik performans is UV-vis spektroskopisi ile incelendi. Manyetik dendrimerler 4-NPnin indirgenmesinde kullanıldı bu işlem sırasında hız sabiti kapp değeri ise 4x10-3 s-1 olarak belirlendi.

Keywords

Fe3O4 Nanoparçacıklar, Manyetik Dendrimerler, WO3 Nanoparçacıklar, 4-Nitrofenol

Project Number

KLÜBAP 236 and KLÜBAP 229

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