A magnetic Fe 3 O 4 @ZnO nanocomposite (NC) was successfully synthesized by a wet milling method using a high energy milling (HEM) machine. The magnetic Fe 3 O 4 @ZnO NC was characterized by an X-ray Diffractometer (XRD), scanning and transmission electron microscopes (SEM and TEM), and a vibrating sample magnetometer (VSM @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 Fe 3 O 4 @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 Fe 3 O 4 @ZnO NC can be easily collected by an external magnet. The magnetic Fe 3 O 4 @ZnO NC could be extended to various potential applications, such as purification processes, catalysis, separation, and photodegradation.
Fe3O4/TiO2composites were prepared by heteroagglomeration. The composites of different Fe3O4to TiO2weight ratio were prepared by mixing of prepared Fe3O4with TiO2in aqueous slurry, under ultrasonic treatment. All prepared samples were characterized by XRD, VSM, SEM/EDS, raman spectroscopy and BET. The prepared composites contained TiO2(anatase and rutile) and Fe3O4crystal phases. The magnetization hysteresis loop for Fe3O4/TiO2nanocomposites indicated that the hybrid catalyst showed superparamagnetic characteristics at room temperature. Photocatalytic performance of the prepared composites was examined by its ability to degrade methylene blue dye in aqueous solution. The photocatalytic activity of Fe3O4/TiO2composites was lower than that of pure TiO2sample because of the presence of non-active photocatalytic in composite (iron oxide). Under UV irradiation, the photocatalytic activity of Fe3O4/TiO2(1:1) composite was relatively similar to Fe3O4/TiO2(1:2), however, under sunlight irradiation, the photocatalytic activity of Fe3O4/TiO2(1:2) composite was relatively increase. The Fe3O4/TiO2composite can be easily recovered from treated water in slurry-type reactor by the application of an external magnetic field.
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