摘要
A facile and reproducible method has been developed for the synthesis of ordered anatase Mn-TiO2 nanospheres with controllable sizes in the range 200-300 nm by simply varying the amount of manganese（lI） 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 （Mn4＋/Mn3＋） and substitutes for some of the Ti4＋ in the anatase TiO2 lattice. The presence of Mn significantly influences the morphology and high-temperature stability of TiO2, and extends its light absorption range. Surface photovoltage and photocurrent measurements revealed that an electronic interaction between the Mn and TiO2 was present, in which Mn served as an electron acceptor and effectively inhibited the charge recombination in TiO2; this is thought to be responsible for the highly efficient photocatalytic activity of the material in the degradation of rhodarnine B （RhB） under visible-light irradiation （λ 〉 420 nm）.
一个灵巧、可再现的方法在范围与可控制的尺寸为订的锐钛矿 Mn-TiO2 nanospheres 的合成被开发了由简单地改变锰(II ) 的数量的 200300 nm 增加的氯化物。样品被X光检查描绘衍射( XRD )，X光检查光电子光谱学( XPS )，扫描电子显微镜( SEM )，和传播电子显微镜( TEM )大小，并且锰在多价的形式(Mn4+/Mn3+)存在并且在锐钛矿 TiO2 格子代替一些Ti4+，这被发现。Mn 的存在显著地影响形态学和 TiO2 的高温度的稳定性，并且扩大它的轻吸收范围。表面 photovoltage 和光电流大小表明在 Mn 和 TiO2 之间的一个电子相互作用是现在， Mn 在用作一个电子领受人并且有效地在 TiO2 禁止了充电再结合；这被认为在可见光的照耀下面为在玫瑰精 B (RhB ) 的降级的材料的高度有效的 photocatalytic 活动负责(> 420 nm ) 。
基金
This work was supported by National Program on Key Basic Research Project （973 Program） （No. 2007CB613303） and the National Natural Science Foundation of China （Nos. 20703020 and 20873053）.
