HNTs/TiO2/MoS2复合材料的制备及其在氯四环素光催化降解中的应用

Preparation of halloysite nanotube/TiO2/MoS2 composite and its application in photocatalytic degradation of chlorotetracycline

利用两步反应制备了HNTs/TiO2/MoS2复合材料,并通过X射线衍射仪、透射电镜、扫描电镜、紫外-可见漫反射光谱仪等对复合材料的结构形貌、化学成分以及光学性能进行了表征,并利用氯四环素(CTC)在水相中的光催化降解对制备的样品进行光催化活性的评价。结果表明,TiO2粒子均匀地吸附在HNTs的表面,MoS2的引入成功地扩大了TiO2的光响应范围;与单半导体MoS2和二元复合材料HNTs/TiO2相比,三元复合材料HNTs/TiO2/MoS2具有更高的光催化活性。HNTs/TiO2/MoS2三元结构经过4次循环后显示出良好的光稳定性。

Halloysite nanotube/TiO2/MoS2 composites(HNTs/TiO2/TiO2)are successfully prepared by a simple two-step reaction.The structure,chemical composition and optical properties of the composites are investigated by X-ray diffraction,transmission electron microscopy,scanning electron microscopy and UV-visible diffuse reflectance spectroscopy,respectively.Photocatalytic degradation of chlorotetracycline(CTC)in aqueous phase is used to evaluate the photocatalytic activity of the prepared samples.Results show that TiO2 nanoparticles are loaded on the surface of HNTs uniformly and the addition of MoS2 successfully expands the light response range of TiO2.The ternary composite HNTs/TiO2/MoS2 has higher photocatalytic activity than the single semiconductor MoS2 and the binary composite HNTs/TiO2.HNTs/TiO2/MoS2 ternary structure can be regenerated by washing and drying for more than four times,which is useful for practical applications.