Synthesis and Characterization of Ca1-xCoxTiO3 and its Photocatalytic Activity on Photodegradation of Methylene Blue

A.K. Prodjosantoso1,*, C. Kusumawardani1, M.P. Utomo1 and C.T. Handoko2

1Chemistry Department, Yogyakarta State University, Yogyakarta 5528, Indonesia

2Environmental Science Department, University of Sriwijaya, Palembang 30662, Indonesia

*Corresponding author: E-mail:


A series of Ca1-xCoxTiO3 has been prepared through the ceramic method as polycrystalline powders with x = 0, 0.01, 0.025, 0.05 and 0.1. The structure of resulting materials was refined from a powder X-ray diffraction using the Rietvield method showing the perovskite-type structure isostructural with CaTiO3. The morphology and particle size of Ca1-xCoxTiO3 were studied using SEM/EDX that showed a particle size of around 3.5 nm with non-homogenous particle sphere shapes. The electronic structure of CaxCo1-xTiO3 was studied by UV/visible spectroscopy method, which showed that the prepared Ca1-xCoxTiO3 having good response in the visible region with the band gap energy (Eg) of around 2.2 eV, which is highly potent as visible light photocatalysts. The adsorption capacity and adsorption equilibrium constant of the oxides to the methylene blue were also studied. The adsorption process in Ca1-xCoxTiO3 materials follows the Langmuir adsorption type as a consequence of homogenous pore structures. The catalytic activity of Ca1-xCoxTiO3 on the methylene blue degradation are also discussed.


Ca1-xCoxTiO3, Perovskite structure, Visible-light photocatalyst.

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