Electrodeposition synthesis of MnO2/TiO2 nanotube arrays nanocomposites and their visible light photocatalytic activity

• MnO2/TiO2 nanotube arrays nanocomposites are prepared by electrodeposition.
• MnO2/TiO2 exhibits high visible light photocatalytic activity.
• The results of XRD show the depositions are attributed to α-MnO2.
• A photocatalytic mechanism is discussed under visible light irradiation.

MnO2/TiO2 nanotube arrays nanocomposite photocatalysts have been synthesized through an electrodeposition method. X-ray powder diffraction analysis and X-ray photoelectron spectroscopy measurements reveal that the products of electrodeposition method are MnO2. Scanning electron microscopy measurements suggest that the depositions are deposited on the surface or internal of the nanotube. UV–vis light absorbance spectra demonstrate the excellent adsorption properties of MnO2/TiO2 over the whole region of visible light, which enables this novel photocatalytic material to possess remarkable activity in the photocatalytic degradation of acid Orange II under visible light radiation. Moreover, a possible photocatalytic mechanism is discussed.

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