A facile and reproducible method has been developed for the synthesis of ordered anatase Mn-TiO 2 nanospheres with controllable sizes in the range 200–300 nm by simply varying the amount of manganese(II) chloride added. The samples were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscope (SEM), and transmission electron microscope (TEM) measurements, and it was found that the manganese exists in multivalent forms (Mn 4+ / Mn 3+ ) and substitutes for some of the Ti 4+ in the anatase TiO 2 lattice. The presence of Mn significantly influences the morphology and high-temperature stability of TiO 2 , and extends its light absorption range. Surface photovoltage and photocurrent measurements revealed that an electronic interaction between the Mn and TiO 2 was present, in which Mn served as an electron acceptor and effectively inhibited the charge recombination in TiO 2 ; this is thought to be responsible for the highly efficient photocatalytic activity of the material in the degradation of rhodamine B (RhB) under visible-light irradiation ( λ > 420 nm).
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Li et al. (2011) studied this question.
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