碳载Au/TiO_2光催化材料的制备与拉曼增强特性

Preparation of Carbon Loaded Au-TiO_2 Photocatalysts and Their Surface-enhanced Raman Scattering Properties

采用强度高和柔软性好的碳纤维、碳纳米管、氧化石墨烯为载体,负载Au纳米粒子掺杂的TiO_2,获得碳载Au/TiO_2高效光催化剂。通过X射线衍射、扫描电镜、拉曼等表征手段,考察了所得碳载Au/TiO_2的结构、形貌与性能。所得碳载Au/TiO_2在汞灯照射下可有效地降解亚甲基蓝染料分子。其中Au粒子有效抑制了TiO_2表面光生电子-空穴的复合,增强了光生载流子的分离效率,提高了TiO_2的光催化性能;碳载体提高了Au/TiO_2催化剂活性组分的分散度,促进了亚甲基蓝分子的吸附,对Au/TiO_2的光催化活性具有良好的协同效应。拉曼实验表明,Au/TiO_2/CF、Au/TiO_2/GO_也是一种优秀的表面增强拉曼散射检测基底。同时,Au/TiO_2/CF、Au/TiO_2/GO_可在汞灯照射下"清洗"掉表面吸附的上组表面增强拉曼散射实验中的检测分子,实现基底的循环利用。

Carbon fiber（CF）,carbon nanotubes（CNT）and graphene oxide（GO）were applied as carrier for supporting Au-coated TiO2 photocatalytic materials,respectively.The structural details,morphology and properties of carbon loaded Au/TiO2 were characterized by X-ray diffraction（XRD）,scanning electron microscope（SEM）and Raman spectroscopy.The resultant carbon loaded Au/TiO2 could photodegrade methylene blue（MB）molecules effectively under mercury lamp light irradiation.The Au nanoparticls could enhance the interfacial charge transfer,stop the recombination of e-h＋pairs and enhance the photocatalytic efficient.The carbon supports could increase the dispersion of Au/TiO2 catalyst,promote the adsorption of MB,and with a good synergistic effect on the photocatalytic activity of Au/TiO2.In addition,Raman experiments showed that Au/TiO2/CF,Au/TiO2/GO were also excellent surface-enhanced Raman scattering（SERS）substrates.The Au/TiO2/CF,Au/TiO2/GO substrates can clean themselves by photodegradation of adsorbates under mercury lamp light irradiation,and be reused for recycling SERS detection.