锰掺杂纳米二氧化钛的制备及其可见光催化性能

Mn-doped TiO2 nanocrystal photocatalysts, named Mn-TiO2-S and Mn-TiO2-C samples, were synthesized by a simple hydrothermal synthesis method using MnSO4•H2O and MnC2O4•4H2O as manganese source, respectively. The samples were characterized by X-ray diffraction and UV-vis diffuse reflectance spectroscopy. The photocatalytic activity for the degradation of rhodamine B was evaluated, and the effects of the manganese source and Mn doping amount were investigated. The results showed that all of the Mn-TiO2 had an anatase crystallite structure and the Mn doping inhibited the growth of the TiO2 particles. The particle size of Mn-TiO2-S was smaller than that of Mn-TiO2-C. The absorption edge of Mn-TiO2 shifted to the visible light region. The Mn-TiO2 showed obvious photocatalytic activity for the degradation of rhodamine B under visible light irradiation, and Mn-TiO2-S samples showed higher photocatalytic activity than undoped TiO2 and Mn-TiO2-C samples.