论文部分内容阅读
采用 Sol-gel法制备了纯的和掺杂不同量 Cu的 Ti O2 纳米粒子 ,并用 TG-DTA,XRD,XPS,UV-Vis和荧光光谱对样品进行了表征 ,考察焙烧温度和 Cu含量对 Ti O2 纳米粒子的性质及光催化活性的影响 ,初步探讨了 Cu的掺杂对 Ti O2 相变的作用机制及样品荧光光谱与光催化活性的关系 .结果表明 ,Cu2 + 的掺杂对 Ti O2 的相变有很大的促进作用 ,并使其光谱响应范围向可见光区拓展 .Cu的掺杂未引起新的荧光现象 ,但适量 Cu的掺杂能够降低 Ti O2 纳米粒子的荧光强度 .此外 ,在光催化降解苯酚的实验中 ,于 5 0 0℃处理的掺杂 Cu的 Ti O2 纳米粒子的光催化活性较高 ,与表征结果一致 .而掺杂不同量 Cu的 Ti O2 的光催化活性顺序与样品荧光光谱强度的顺序相反 ,即荧光光谱强度越低 ,其光催化活性越高 .
The pure and doped Ti O2 nanoparticles with different amounts of Cu were prepared by Sol-gel method. The samples were characterized by TG-DTA, XRD, XPS, UV-Vis and fluorescence spectroscopy. The effects of calcination temperature and Cu content on the mechanical properties of Ti O2 nanoparticle properties and photocatalytic activity, the mechanism of the Cu doping on the phase transition of Ti O2 and the relationship between the fluorescence spectra and the photocatalytic activity of the sample were investigated. The results show that the doping of Cu2 + Phase transition has a great role in promoting and expanding the spectral response to the visible region.Cu doped did not cause new fluorescence phenomenon, but the amount of Cu doping can reduce the fluorescence intensity of Ti O2 nanoparticles.In addition, in the In the experiment of photocatalytic degradation of phenol, the photocatalytic activity of Cu-doped TiO 2 nanoparticles treated at 500 ℃ was consistent with the characterization results.The photocatalytic activity of TiO 2 doped with different amounts of Cu was The order of the fluorescence intensity of the sample is opposite, that is, the lower the fluorescence intensity, the higher the photocatalytic activity.