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摘要
Magnesium doped barium titanate photocatalysts (Ba(1-x)MgxTiO3(x=0, 0.10, 0.20, 0.30, 0.40), BMT) were synthesized by a facile hydrothermal process without the use of any surfactants or templates and characterized by X-ray diffraction (XRD), field emission scanning electron microscope (FESEM), transmission electron microscope (TEM), and UV-Vis diffuse reflectance spectroscopy (DRS). FESEM results show that different morphologies could be fabricated by simply manipulating the concentrations of hydroxide ions. In this case, hydroxide ions seem to play a key role in controlling the formation of seeds and growth rates of BMT particles. On the basis of structural analysis of samples obtained at different conditions, a possible mechanism for the formation of these distinctive morphologies is proposed. UV-Vis DRS results demonstrate that the band gap of BMT sample is about 2.61 eV. The as-prepared BMT photocatalysts exhibite higher photocatalytic activities for the degradation of methyl orange (MO) under visible light irradiation than that of N-TiO2 obtained by the traditional method. Furthermore, BMT nanorods prepared at OH- concentration of 8 mol.L-1 show the highest photocatalytic activity. A 93.0% degradation of MO solution (0.01 mmol.L-1) is obtained over this catalyst after visible light irradiation for 360 min. In addition, there is no significant decrease in the photocatalytic activity after 4 recycles, indicating that BMT is a stable photocatalyst for degradation of MO under visible light irradiation.
