@article{Rostami-Vartooni_Moradi-Saadatmand_Bagherzadeh_Mahdavi_2024, title={Green synthesis of Ag/Fe3O4/ZrO2 nanocomposite using aqueous Centaurea cyanus flower extract and its catalytic application for reduction of organic pollutants}, volume={9}, url={https://oiccpress.com/iranian-journal-of-catalysis/article/green-synthesis-of-ag-fe3o4-zro2-nanocomposite-using-aqueous-centaurea-cyanus-flower-extract-and-its-catalytic-application-for-reduction-of-organic-pollutants/}, abstractNote={In this work, at first, nano ZrO2 and Fe3O4/ZrO2 nanocomposite were prepared by sol-gel and co-precipitation methods, respectively. Then, Ag nanoparticles (Ag NPs) were mixed with themin environmentally friendly and mild conditions using C. cyanus flower extract as a reducing and stabilizing agent. The synthesized nanocomposites were characterized by FT-IR, XRD, FE-SEM, EDS, and VSM techniques. The experimental results confirmed formation of the Ag nanoparticles with the 30-90 nm diameter on the surface of supports at room temperature within a few minutes. After that, the catalytic activity of the prepared nanocomposites in reduction of 4-nitrophenol (4-NP) and methyl orange (MO) have been studied and our results showed that they have following sequence: Ag/ZrO2 > Ag/Fe3O4/ZrO2 > ZrO2 > ZrO2 (550 °C) > Fe3O4/ZrO2. Finally, the magnetically recoverable Ag/Fe3O4/ZrO2 nanocomposite could be reused three times without a considerable decrease in its catalytic activity. Observed results were presented here and the probable catalytic mechanism was discussed.}, number={1}, journal={Iranian Journal of Catalysis}, publisher={OICC Press}, author={Rostami-Vartooni, Akbar and Moradi-Saadatmand, Abolfazl and Bagherzadeh, Mojtaba and Mahdavi, Mohammad}, year={2024}, month={Feb.}, keywords={Zirconia, Magnetic support, Green synthesis. Organic pollutant, Ag Nanoparticles, Centaurea cyanus} }