nanomaterial

1. Excellent catalytic performance of Fe3O4/reduced graphene oxide/Ag nanoparticles
composite microflowers prepared by a facile onestep reduction process
Kejuan Lianga, Xiangqing Lia*, Shi-Zhao Kanga, Lixia Qin, Guodong Lib and Jin Mua*
School of Chemical and Environmental Engineering, Shanghai Institute of Technology,
100 Haiquan Road, Shanghai 201418, China
State Key Laboratory of Inorganic Synthesis Preparative Chemistry, College of
Chemistry, Jilin University, Changchun 130012, China

2. Aim
To synthesis Fe3O4 / reduced graphene oxide /Ag nanoparticles composite to produce
catalytic activity
Objectives
• To prepare the composite using electrostatic self assembly technique & one step reduction
process
• To characterize the composite with power X-ray diffraction, Raman spectroscopy, scanning
electron microscopy ,X-ray photoelectron spectroscopy and electrochemical impedance
spectroscopy.
• To study catalytic activity of Fe3O4/ RGO/Ag NPs using17 rhodamine B (RhB) as a
degradation substrate and NaBH4 as a reducing agent

3. Introduction
• Organic pollutants are difficult to be rapidly degraded using traditional methods
• Noble metals, such as Au, Pt, Pd and Ag, have been proven to be effective “active sites”
for the degradation of organ pollutants
• Ag NPs easily aggregate due to high surface energy
• Composites containing graphene and Ag NPs
• Difficult in recovery of graphene loaded Ag NPs from the reaction system
• Fe3O4 NPs /Graphene /Ag NPs composite easly recovered due to its magnetic
property

4. Materials and methods
• Fe3O4 microflowers were prepared using a solvothermal reaction combined with
precursor thermal conversion method
• The graphite oxide (GO) was obtained using a modified Hummers method
125 mg 86 of Fe3O4 + dispersed into 6.25 mL of isopropyl alcohol
1.Stirring
2.31.3 µL of APTES add (Drop wise)
3. Refluxed for 2 h
4. cooled to room temperature and centrifuged
Solid obtained (Fe3O4 modified with APTES) was
90 washed with ethanol and deionized water

5. Fe3O4 modified (APTES) dispersed into 10 mL of deionized water
+
1.25 mL of GO aqueous (1 mg /mL)
Stirred overnight @ room temp
Fe3O4 microflowers loaded with GO
+
3.1 mL of silver nitrate (mg /ml)
room temperature for 4 h
3.1 mL of NaBH4 (0.1 mol /l )
90 C for 5 h
Dried at the room temperature for 24 h under vacuum.
Fe3O4/ RGO/Ag NPs