铋掺杂二氧化钛纳米颗粒的制备及其可见光催化性能

摘要

Bi-doped TiO2 photocatalysts were prepared by a hydrothermal method using nanotube titanic acid as the Ti precursor. The samples were characterized by X-ray diffraction, transmission electron microscopy, ultraviolet-visible diffuse reflectance spectroscopy, and X-ray photoelectron spectros-copy. Methyl orange (MO) was used as a model contaminant to evaluate the visible light photocata-lytic activity of the Bi-doped TiO2 samples. We found that the Bi ions did not incorporate into the TiO2 lattice but instead existed in the form of BiOCl. The obtained BiOCl-composited TiO2 samples exhibited remarkable photocatalytic activity under visible light irradiation for the photodegradation of MO. The sample obtained when the Bi/Ti molar ratio was 1%and the hydrothermal treatment temperature was 130 °C (BTO-130-1) showed the highest photocatalytic activity. Moreover, a pos-sible mechanism was proposed and the enhanced photocatalytic activity was discussed. The as-prepared catalyst also showed high photocatalytic activity for the photodegradation of 4-chloro-phenol.%采用水热法,以纳米管钛酸为前驱物制备了Bi掺杂的TiO2,并利用X射线衍射、透射电子显微镜、X射线光电子能谱、紫外-可见漫反射光谱等手段对样品进行了表征。以甲基橙的光催化降解为模型反应评价了样品的可见光催化性能。结果表明, Bi离子并没有进入TiO2的晶格中,而是以BiOCl的形式存在。所制得的BiOCl/TiO2复合物对甲基橙降解表现出较优越的可见光催化活性；当Bi/Ti摩尔比为1%,水热温度为130ºC时,所制催化剂的光催化性能最佳,并对光催化活性提高的机理进行了讨论。同时,该催化剂对4-氯苯酚降解也表现出较高的光催化性能。