Vol 7, No 3 (2016) > Metalurgy and Material Engineering >

Synthesis, Characterization, and Photocatalytic Activity of Fe3O4@Zno Nanocomposite

Didin Sahidin Winatapura, Sari Hasnah Dewi, Wisnu Ari Adi


Abstract: A magnetic Fe3O4@ZnO
nanocomposite (NC) was successfully synthesized by a wet milling method using a high energy milling
(HEM) machine. The magnetic Fe3O4@ZnO NC was characterized by an X-ray Diffractometer (XRD), scanning and transmission
electron microscopes (SEM
and TEM), and a vibrating sample magnetometer (VSM). X-ray diffraction results show that Fe3O4@ZnO NC consisted of ZnO
and Fe3O4 phases. The microstructure analysis indicated
that Fe3O4@ZnO NC presented a ZnO shell wrapped around
the surface of a magnetic Fe3O4 surface. The average diameter of the aggregated Fe3O4 nanoparticle
(NP) is 20 nm, while that of Fe3O4@ZnO NCs is
nearly 30 nm. The  Fe3O4 NP and Fe3O4@ZnO
NC show typical superparamagnetic
behavior with low coercivity. The saturation magnetization (Ms) of Fe3O4 NP was measured at about 66.26emu.g-1 and then declined to 34.79emu.g-1 after being encapsulated with a ZnO shell.  The photoactivities of the Fe3O4@ZnO NC under
UV irradiation were quantified by the degradation of a methylene blue (MB) dye
solution. The result reveals that the
photodegradation efficiency of Fe3O4@ZnO NC is favorable at pH neutral (pH = 7) reaching 100%. By increasing the MB dye
concentration from 10 ppm to 40 ppm, the photodegradation efficiency decreases
from 100% to 52%. The Fe3O4@ZnO NC can be easily collected by an external magnet. The
magnetic Fe3O4@ZnO
NC could be extended to various potential applications,
such as purification processes, catalysis, separation, and photodegradation.
Keywords: Fe3O4@ZnO nanocomposite; Methylene blue; Photocatalytic activity; Photodegradation; Wet milling

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