【摘要】 利用溶胶-凝胶法,制备了TiO₂和Mo@TiO₂纳米粒子。采用液相沉积法,将TiO₂和Mo@TiO₂纳米粒子沉积到GO上面,制备了rGO/TiO₂和rGO/Mo@TiO₂纳米复合材料。利用SEM、XRD、XPS、FT-IR和拉曼光谱分别对TiO₂、Mo@TiO₂、rGO/TiO₂和rGO/Mo@TiO₂样品的形貌、晶型结构、离子状态以及材料的复合情况进行了研究;利用紫外-可见分光光度计测定了样品的UV-Vis吸收光谱。结果表明,制备的所有样品中的TiO₂均为锐钛矿型,且GO大部分被还原成了rGO;Mo@TiO₂、rGO/TiO₂和rGO/Mo@TiO₂样品的UV-Vis吸收光谱谱带向可见光区域内明显移动,纳米复合材料可见光利用率得到明显提升;Mo和rGO的引入,使样品的Ti2p和Mo3d光谱强度降低,XPS光谱均发生了红移,从而导致TiO₂表面化学环境发生变化,特征峰向较高的结合能处偏移;SEM分析表明,rGO和TiO₂之间具有良好的相互作用,在rGO表面沉积Mo@TiO₂颗粒后,其形貌保持不变,形成了rGO/Mo@TiO₂纳米复合材料;rGO/Mo@TiO₂纳米复合材料的光催化活性最高,3 h对p-NP的降解率为84%,而TiO₂、rGO/TiO₂和Mo@TiO₂ 3 h对p-NP的降解率分别为26%,42%和61%。更多还原

【Abstract】 TiO₂ and Mo@ TiO₂ nanoparticles are prepared by sol-gel method and rGO/TiO₂ and rGO/Mo@TiO₂ composite materials are prepared by deposition of TiO₂ and M0@TiO₂ nanoparticles on GO by liquid phase deposition method. SEM,XRD,XPS,FT-IR and Raman spectra are used to study the morphology, crystal structure, ionic state and composite of the TiO₂,Mo@TiO₂,rGO/TiO₂ and rGO/Mo@TiO₂ samples. The UV-Vis absorption spectra of the samples are measured by UV-Vis spectrophotometer. The results show that TiO₂ in all samples prepared by the experiment is anatase type, and most of GO is reduced to rGO. The UV-Vis absorption spectra band of the Mo@TiO₂,rGO/TiO₂ and rGO/Mo@TiO₂ samples move to the visible region, and the visible light utilization rate of the nanocomposites is significantly improved. With the introduction of Mo and rGO, the spectral intensities of Ti2 p and Mo3 d are decreased, and the XPS spectra are red shifted, which leads to the change of the chemical environment on the surface of TiO₂, and the characteristic peaks shift to the higher binding energy. SEM analysis shows that there is a good interaction between rGO and TiO₂, and after the Mo@TiO₂ particles are deposited on the surface of RGO, the morphology of the particles remains unchanged and rGO/Mo@TiO₂ nanocomposites is formed. The photocatalytic activity of the rGO/Mo@TiO₂ nanocomposites is the highest, and the degradation rate of p-NP at 3 h is 84%, while that of TiO₂, rGO/TiO₂ and Mo@TiO₂ degradation rates of p-NP at 3 h are 26%, 42% and 61%, respectively.更多还原