PbS/K2 La2 Ti3 O10复合物的制备及光催化活性研究

摘要

采用沉淀法制备了一系列不同 PbS 担载量的PbS/K2 La2 Ti3 O10复合光催化剂。利用 X 射线衍射(XRD)、场发射扫描电镜(SEM)、透射电镜(TEM)、X射线荧光光谱仪(XRF)、紫外-可见漫反射(UV-Vis)、X射线光电子能谱(XPS)和分子荧光光谱(PL)等技术对催化剂进行表征。以可见光下降解罗丹明B为研究对象,考察了催化剂负载量和投加量对光催化活性的影响。结果表明,PbS的担载扩展了K2 La2 Ti3 O10对可见光的响应,催化活性明显提高,0.35 g PbS(25%,质量分数)/K2 La2 Ti3 O10在可见光下反应2h后降解率可达71.4%。%A series of PbS/K2 La2 Ti3 O10 composite photocatalysts with different PbS content were prepared via a facile precipitation method.The prepared samples were characterized by X-ray diffraction (XRD),scanning electron microscopy (SEM),transmission electron microscopy (TEM),X-ray fluorescence spectrometer (XRF),ultraviolet-visible diffuse reflection (UV-Vis),X-ray photoelectron spectroscopy (XPS)and photolu-minescence measurement (PL).The photocatalytic activities of the catalysts were evaluated by photocatalytic degradation of Rhodamin B under visible light irradiation.The effect of PbS content and dosage of catalyst for photocatalytic degradation Rhodamin B were also investigated.The results revealed that the PbS/K2 La2 Ti3 O10 composites greatly improved the photocatalyst activity under visible light.The photocatalytic activity of degra-dation of Rhodamin B for 0.35 g (25wt%)PbS/K2 La2 Ti3 O10 composite photocatalyst was 71.4% under visible light irradiation for 2 h.