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以梧桐树叶为模板制备了具有网状结构的TiO2和Fex/TiO2光催化材料.通过扫描电镜(SEM)、X-射线衍射(XRD)、X-射线光电子能谱(XPS)、荧光发射光谱(PL)、紫外-可见吸收光谱(UV-Vis)等对这两类光催化材料的结构和物理性能进行了表征.结果表明,以树叶为模板制得的Fe0.005/TiO2呈网状结构.在600～800℃范围内,随煅烧温度的升高,网状TiO2和Fe0.005/TiO2中锐钛型TiO2的含量减少,Fe3+的掺杂能促进锐钛型向金红石型的转变.与Degussa P25相比,网状TiO2和Fex/TiO2的荧光光谱强度明显减弱,光生电子-空穴对的复合情况得到改善;吸收光谱范围明显红移,禁带宽度有不同程度的缩小.孔雀石绿的光催化降解实验表明,网状TiO2和Fex/TiO2具有比Degussa P25更强的催化活性.光催化活性的稳定性研究表明,网状Fe0.005/TiO2具有良好的稳定性,能多次重复使用.
The TiO2 and Fex / TiO2 photocatalytic materials with network structure were prepared from the leaves of Platycladus orientalis.Through SEM, XRD, XPS and fluorescence emission spectrum PL and UV-Vis were used to characterize the structure and physical properties of these two kinds of photocatalytic materials. The results showed that the Fe0.005 / TiO2 network prepared from leaves was a network structure. The content of anatase TiO2 in reticular TiO2 and Fe0.005 / TiO2 decreases with the calcination temperature increasing from 600 ℃ to 800 ℃, and the doping of Fe3 + can promote the transformation from anatase to rutile.Compared with Degussa P25, the fluorescence intensity of reticular TiO2 and Fex / TiO2 decreased significantly, the recombination of photogenerated electron-hole pairs was improved, the absorption spectrum range was redshifted, and the forbidden band width was reduced to some extent. Photocatalytic degradation experiments show that the reticular TiO2 and Fex / TiO2 have stronger catalytic activity than Degussa P25.The stability of photocatalytic activity shows that reticular Fe0.005 / TiO2 has good stability and can be reused repeatedly .