INVESTIGATION OF CATALYTIC BEHAVIOUR OF WO3 DOPED MAGNETIC DENDRIMERS

N. Kurnaz Yetim, E. Hasanoğlu Özkan, M. M. Koç
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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.
wo3掺杂磁性树状大分子催化性能的研究
本文制备了WO3纳米粒子修饰磁性聚酰胺胺(PAMAM)树状大分子纳米复合材料,并将其用作4-硝基苯酚(4-NP)还原的催化剂。采用Fe3O4超顺磁性氧化铁纳米颗粒作为磁芯。采用水热法制备了磁性氧化铁纳米颗粒。磁性纳米颗粒核被PAMAM树状大分子覆盖。覆盖过程中使用的树状大分子是第二代树状大分子,旨在保护纳米颗粒不失去磁性。用纳米WO3修饰PAMAM包覆core@shell结构,得到Fe3O4@G2/WO3磁性枝状大分子复合材料。利用SEM、TEM、EDX、XRD等显微、光谱学和晶体学方法对磁性树状大分子进行了结构表征。采用振动样品磁强计对其磁特性进行了评价。用紫外-可见光谱法对磁性树状大分子的催化性能进行了跟踪。用磁性树状大分子还原4-NP。计算反应速率系数kapp为4x10-3 s-1。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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