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RISS 인기검색어
- 검색키워드
- 저자 : Amr Hussein Mady (검색결과 3 건)
- 무료
- 기관 내 무료
- 유료
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Mady, Amr Hussein,Baynosa, Marjorie Lara,Tuma, Dirk,Shim, Jae-Jin Elsevier BV 2017 Applied Catalysis B Vol.203 No.-
<P><B>Abstract</B></P> <P>Nanocomposites of Ag-ZnFe<SUB>2</SUB>O<SUB>4</SUB>@reduced graphene oxide (rGO) were synthesized using a one-pot microwave-assisted self-assembly method. The morphology and structure of the Ag-ZnFe<SUB>2</SUB>O<SUB>4</SUB>@rGO nanocomposites were characterized. The nanocomposites formed with 15.2wt% rGO showed excellent adsorption properties and high photocatalytic activity for the degradation of methylene blue (MB), rhodamine B (RhB), and methyl orange (MO). The synergistic interactions between Ag, ZnFe<SUB>2</SUB>O<SUB>4</SUB>, and rGO decreased the aggregation of the nanoparticles (NPs) and increased the surface area, resulting in better absorption in both UV and visible light. Such a structure was helpful for separating the photo-excited electron-hole pairs and accelerating electron transfer. Electrochemical impedance spectroscopy (EIS) revealed a smaller resistance in the solid-state interface layer and charge transfer on the composite surface than that of the bare ZnFe<SUB>2</SUB>O<SUB>4</SUB> NPs and ZnFe<SUB>2</SUB>O<SUB>4</SUB>@rGO nanocomposite. The Ag-ZnFe<SUB>2</SUB>O<SUB>4</SUB>@rGO nanocomposite could be recovered easily by a magnet and reused five times with no significant decrease in photocatalytic activity. The as-prepared Ag-ZnFe<SUB>2</SUB>O<SUB>4</SUB>@rGO nanocomposite catalyst could be applied to the removal of hard-to-degrade waste materials owing to its high efficiency in both UV and visible light and its excellent reusability.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Ag-ZnFe<SUB>2</SUB>O<SUB>4</SUB>@rGO composite was synthesized by one-pot microwave method in 10min. </LI> <LI> The composite had a very large surface area and showed very high performance. </LI> <LI> The composite decomposed 20ppm MB very fast within 30min under visible light only. </LI> <LI> The composite showed excellent recyclability and reusability. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
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Mady, Amr Hussein,Baynosa, Marjorie Lara,Tuma, Dirk,Shim, Jae-Jin Elsevier 2019 Applied Catalysis B Vol.244 No.-
<P><B>Abstract</B></P> <P>Three-dimensional (3D) γ-MnO<SUB>2</SUB>@ZnFe<SUB>2</SUB>O<SUB>4</SUB>/reduced graphene oxide (rGO) nanohybrids were synthesized using a one-pot hydrothermal self-assembly method. The morphology and properties of the nanohybrids were investigated. The synergistic interactions among γ-MnO<SUB>2</SUB>, ZnFe<SUB>2</SUB>O<SUB>4</SUB>, and rGO resulted in 3D nanoflakes distributed uniformly in the rGO structure with a thickness of approximately 2–5 nm, leading to a high surface area. The nanohybrid containing 10 wt. % rGO exhibited superior catalytic activities for phenol degradation through the activation of peroxymonosulfate (PMS) to generate active sulfate radicals ( S O 4 • – ). Typically, 50 mL of a 20 ppm phenol solution was degraded completely and 85% of the carbon content had been mineralized in 30 min at 25 °C using 10 mg of the nanohybrid. The nanohybrid could be recovered easily using a magnet and reused, maintaining high stability during catalytic oxidation. The 3D γ-MnO<SUB>2</SUB>@ZnFe<SUB>2</SUB>O<SUB>4</SUB>/rGO nanohybrid catalyst could be applied to the removal of hard-to-degrade waste materials owing to its high efficiency and excellent reusability.</P> <P><B>Highlights</B></P> <P> <UL> <LI> 3D γ-MnO<SUB>2</SUB>@ZnFe<SUB>2</SUB>O<SUB>4</SUB>/rGO nanohybrid was synthesized by one-pot hydrothermal method. </LI> <LI> The hybrid had a very large surface area and showed very high performance. </LI> <LI> The hybrid decomposed 20 ppm phenol in 30 min in the presence of PMS. </LI> <LI> 95% of the carbon content was mineralized in 3 h. </LI> <LI> The hybrid showed excellent recyclability and reusability. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
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