Özet:

The core-shell structure of Ce-doped TiO2@SiO2@(Ni-Cu-Zn) ferrite noted of CTSF as composite nanoparticles (NPs) was synthesized using a modified sol-gel method. The physicochemical properties of as-prepared products were characterized completely by X-ray diffraction (XRD), Brunauer-Emmit-Teller (BET), X-ray photoelectron spectroscopy (XPS) and superconducting quantum interference device (SQUID), serially. Meanwhile, assessment of the photocatalystic activity of catalyst was performed by ultraviolet-visible spectrometry (UV-vis). The results of the study show that the anatase phase related to the TiO2 structure was constructed on the outer shell coating of composite NPs. However, the second phase associated with the Ce structure was not easy to be detected on the XRD pattern, confirming that the doping Ce had been incorporated into the TiO2 crystal structure. The mesoporous structure of Ce-doped TiO2 layers was demonstrated by the type IV isotherm and H3 type hysteresis loop. The homogenous pore size was generated with the specific surface area up to 111.916 m2/g and 0.241 cc/g of pore volume. The stoichiometry of the chemical composition formed with fewer defects on the surface of TiO2 layers was exhibited by the symmetry curve of Ti 2p3/2 and Ti 2p1/2 peaks of XPS spectra. Meanwhile, the redox couple corresponding to Ce3+/Ce4+ was incorporated inside the thin TiO2 coating. Furthermore, the catalyst magnetic NPs can be also separated by using an external magnetic field from the reaction system. The product performance associated with the degradation efficiency was achieved to be 50 % in the aqueous solution of methylene blue (MB) Author Biographies Fachruddin Fachruddin, State Polytechnic of Jakarta Depok 16424, Jawa Barat, Indonesia Master of Engineering Department of Mechanical Engineering

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