Bajorowicz Beata, Cybula Anna, Winiarski Michał J, Klimczuk Tomasz, Zaleska Adriana
Department of Chemical Technology, Faculty of Chemistry, Gdansk University of Technology, ul. G. Narutowicza 11/12, Gdansk 80-233, Poland.
Department of Solid State Physics, Faculty of Applied Physics and Mathematics, Gdansk University of Technology, ul. G. Narutowicza 11/12, Gdansk 80-233, Poland.
Molecules. 2014 Sep 24;19(9):15339-60. doi: 10.3390/molecules190915339.
Single semiconductors such as KTaO3, CdS MoS2 or their precursor solutions were combined to form novel binary and ternary semiconductor nanocomposites by the calcination or by the hydro/solvothermal mixed solutions methods, respectively. The aim of this work was to study the influence of preparation method as well as type and amount of the composite components on the surface properties and photocatalytic activity of the new semiconducting photoactive materials. We presented different binary and ternary combinations of the above semiconductors for phenol and toluene photocatalytic degradation and characterized by X-ray powder diffraction (XRD), UV-Vis diffuse reflectance spectroscopy (DRS), scanning electron microscopy (SEM), Brunauer-Emmett-Teller (BET) specific surface area and porosity. The results showed that loading MoS2 onto CdS as well as loading CdS onto KTaO3 significantly enhanced absorption properties as compared with single semiconductors. The highest photocatalytic activity in phenol degradation reaction under both UV-Vis and visible light irradiation and very good stability in toluene removal was observed for ternary hybrid obtained by calcination of KTaO3, CdS, MoS2 powders at the 10:5:1 molar ratio. Enhanced photoactivity could be related to the two-photon excitation in KTaO3-CdS-MoS2 composite under UV-Vis and/or to additional presence of CdMoO4 working as co-catalyst.
诸如KTaO3、CdS、MoS2等单一半导体或其前驱体溶液,分别通过煅烧法或水热/溶剂热混合溶液法相结合,形成新型二元和三元半导体纳米复合材料。这项工作的目的是研究制备方法以及复合组分的类型和用量对新型半导体光活性材料的表面性质和光催化活性的影响。我们展示了上述半导体用于苯酚和甲苯光催化降解的不同二元和三元组合,并通过X射线粉末衍射(XRD)、紫外-可见漫反射光谱(DRS)、扫描电子显微镜(SEM)、布鲁诺尔-埃米特-泰勒(BET)比表面积和孔隙率进行了表征。结果表明,与单一半导体相比,在CdS上负载MoS2以及在KTaO3上负载CdS显著增强了吸收性能。对于通过以10:5:1摩尔比煅烧KTaO3、CdS、MoS2粉末得到的三元杂化物,在紫外-可见和可见光照射下苯酚降解反应中观察到最高的光催化活性,并且在甲苯去除方面具有非常好的稳定性。增强的光活性可能与KTaO3-CdS-MoS2复合材料在紫外-可见下的双光子激发和/或作为助催化剂的CdMoO4的额外存在有关。