INVESTIGATION OF CATALYTIC BEHAVIOUR OF WO3 DOPED MAGNETIC DENDRIMERS

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.