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Synthesis of magnetic photocatalyst, Fe 3 O 4 /TiO 2 -Co, with characterization and photoactivity examination have been conducted. The synthesis was initiated by preparation of Fe 3 O 4 particles using coprecipitation method. The Fe 3 O 4 particles were then coated with TiO 2 -Co at a various ratio of Fe 3 O 4 :TiO 2 and concentration of Co(II) dopant. The Fe 3 O 4 /TiO 2 -Co was characterized by FTIR, XRD, TEM, SEM-EDX, VSM, and SR UV-visible methods. Photoactivity of the Fe 3 O 4 /TiO 2 -Co was carried out using methylene blue as a target molecule in degradation reaction within a batch system. By using optimum conditions, the degradation of methylene blue solution was performed under exposure to UV, visible light and dark condition. Results showed that the Fe 3 O 4 /TiO 2 -Co formation was confirmed by the presence of Fe 3 O 4 and anatase diffraction peaks in the X-ray diffractogram. SR UV-Vis spectra indicated that the Fe 3 O 4 /TiO 2 -Co was responsive to visible light. Band gap energy of the Fe 3 O 4 /TiO 2 -Co with dopant concentration of 1; 5; 10 and 15% were 3.22; 3.12; 3.09 and 2.81 eV, respectively. The methylene blue solution can be well photodegraded at a pH of 10 for 210 min. The Fe 3 O 4 /TiO 2 -Co has the highest ability to methylene blue photodegradation with dopant concentration of 10% gave degradation yield of 80.51 and 95.38% under UV and visible irradiation, respectively.

indonesian journal of chemistry

Synthesis and Photoactivity of Fe&lt;sub&gt;3&lt;/sub&gt;O&lt;sub&gt;4&lt;/sub&gt;/TiO&lt;sub&gt;2&lt;/sub&gt;-Co as a Magnetically Separable Visible Light Responsive Photocatalyst