Green synthesis of Ag/Fe3O4/ZrO2 nanocomposite using aqueous Centaurea cyanus flower extract and its catalytic application for reduction of organic pollutants

Iranian Journal of Catalysis

مقاله 4، دوره 9، شماره 1، خرداد 2019، صفحه 27-35   

نوع مقاله: Articles

نویسندگان

Akbar Rostami-Vartooni^{* 1}؛ Abolfazl Moradi-Saadatmand¹؛ Mojtaba Bagherzadeh²؛ Mohammad Mahdavi³

¹Department of Chemistry, Faculty of Science, University of Qom, Qom 3716146611, Iran.

²Reactor and Nuclear Safety School, Nuclear Science and Technology Research Institute, 81465-1589, Isfahan, Iran.

³Department of Chemistry, Malek-ashtar University of Technology, Shahin-shahr P.O. Box 83145/115, Iran.

چکیده

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.

کلیدواژه‌ها

Centaurea cyanus؛ Ag Nanoparticles؛ Zirconia؛ Magnetic support؛ Green synthesis؛ Organic pollutant

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