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通过水热方法分别制备了N,B,Fe二元素掺杂和三元素掺杂的TiO2催化剂,并对各样品进行X射线衍射(XRD),紫外-可见漫反射(DRS),N2等温吸脱附、FT-IR等表征.制得的催化剂形貌为颗粒状,晶型主要以锐钛矿相为主,掺杂不影响催化剂的晶型,三元素掺杂TiO2催化剂具有较大的比表面积(220.1m2·g-1),三元素掺杂TiO2催化剂的禁带宽度为2.6eV.降解罗丹明B染料实验结果表明,N,B,Fe三元素掺杂的TiO2催化剂在400nm以上的可见光区有明显吸收,2h内降解率可达70.6%.分析表明,N,B的掺杂,减小了TiO2的带隙,Fe的掺杂,降低了光生电子和空穴复合的几率,三元素掺杂产生了协同效应,共同提高了TiO2在可见光的光催化效率.
The N, B and Fe binary and three-element doped TiO2 catalysts were prepared by hydrothermal method. The samples were characterized by X-ray diffraction (XRD), ultraviolet-visible diffuse reflectance (DRS) FT-IR, etc. The morphology of the prepared catalyst is granular, the crystal type is mainly anatase phase, the doping does not affect the crystal form of the catalyst, and the three-element-doped TiO2 catalyst has a large specific surface area (220.1m2 · g-1), the bandgap of three-element-doped TiO2catalyst is 2.6eV.The experimental results of degradation of rhodamine B dye show that the three-element-doped TiO2catalysts of N, B and Fe are in the visible region And the rate of degradation was up to 70.6% within 2h.The analysis showed that the doping of N and B reduced the band gap of TiO2 and the doping of Fe, reduced the recombination probability of photogenerated electron and hole, Miscellaneous synergies have been produced, together to improve the TiO2 photocatalytic efficiency in visible light.