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以P25为改性对象,尿素为N源,采用研磨-煅烧法制备了具有可见光活性的N掺杂改性P25材料(NP25)。采用XPS电子能谱、X衍射、紫外-可见吸收光谱和透射电镜对催化剂的结构进行表征,并考察了N-P25材料在可见光催化下对亚甲基蓝的降解性能。结果表明,XPS检测发现N-P25在399eV处出现一个N1s峰,N1元素的百分比为0.39%,表明N是通过填隙式的掺杂进入P25,以Ti-O-N键存在,改变了P25的能级结构,诱导其发生红移,在可见光下产生光催化活性。光催化降解试验表明,当煅烧温度为400℃时制备的样品在可见光下反应3h对亚甲基蓝的降解率达到最大值,为60.59%。
Using P25 as the modification target and urea as the N source, an N-doped modified P25 material (NP25) with visible light activity was prepared by a grinding-calcination method. The structure of the catalyst was characterized by XPS, X-ray diffraction, UV-Vis absorption spectra and transmission electron microscopy. The degradation of methylene blue by N-P25 was investigated under visible light irradiation. The results showed that there was an N1s peak at 399eV and the percentage of N1 element was 0.39% at X-ray photoelectron spectroscopy (XPS). The results showed that N was introduced into P25 by interstitial doping and Ti-ON existed, which changed the energy of P25 Level structure, inducing its red shift, in the visible light to produce photocatalytic activity. Photocatalytic degradation experiments showed that when the calcination temperature was 400 ℃, the degradation rate of methylene blue reached 60.59% under the visible light for 3h.