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Abstract-It has been examined the physical and chemical properties of magnetite synthesized mechanically and sonochemically by co-precipitation and reverse co-precipitation methods. Ammonia solution was used as precipitating agent to adjust the pH of the suspension to reach 11. Characterization of the synthesized magnetites was conducted using the Fourier Transform Infrared Spectroscopy (FTIR), the X-ray diffraction (XRD), Scanning electron microscopy (SEM), and Vibrating Sample Magnetometer (VSM). The characterization results showed that the crystallinity of magnetites synthesized by the ordinary mechanically assisted co-precipitation was higher than that of magnetites synthesized by mechanically assisted reverse-co-precipitation. The involvement of sonochemical treatment instead of mechanical treatment gave smaller and more homogeneous crystal size. The morphology of magnetites was spherical and agglomerated with homogeneous size distribution.

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This work implicates the synthesis of biochar-hematite nanocomposite from bamboo sawdust and its photodegradation characteristic for remazol brilliant blue. The nanocomposite was prepared through a one-step pyrolysis process in a tubular furnace under a flow of nitrogen and impregnation using FeSO4.7H2O and FeCl3.6H2O. The physicochemical properties were characterized by x-ray diffraction and Fourier transform infrared spectroscopy, which confirmed that hematite was successfully identified on the surface of the nanocomposite. The results also show that the nanocomposite is suitable for photodegradation application. The decolorization of remazol brilliant blue is suitable with the Langmuir isotherm model and pseudo-second-order kinetic model. At pH = 1, initial concentration = 200 mg/L, contact time = 60 minute and nanocomposite dosage 0.4 g/L, the decolorization efficiency reached 96.9%.