棒状α-Fe_2O_3/ZnO复合物的制备及其光催化性能

Preparation and photocatalytic performance of rod-likeα-Fe_2O_3/ZnO composite

以硝酸锌(Zn(NO_3)_2)、硝酸铁(Fe(NO_3)_3)和氢氧化钠(NaOH)为原料,采用液相沸腾回流法制得了不同长径比的棒状α-Fe_2O_3异质复合ZnO光催化剂。用X射线衍射仪(XRD)、场发射扫描电子显微镜(FESEM)及紫外-可见漫反射光谱(UV-visDRS)等多种手段对产物进行表征。以"三致"污染物五氯酚为降解对象,考察了紫外-可见光照下样品的光催化效果。结果表明,棒状α-Fe_2O_3/ZnO复合光催化剂的性能与其α-Fe_2O_3的含量密切相关。当α-Fe_2O_3与ZnO的物质的量比为1∶5时,样品光催化活性最高,4h内即可将五氯酚降解完全。

Using zinc nitrate,ferric nitrate and sodium hydroxide as the reactants,rod-likeα-Fe2O3/ZnO heterogeneous composite photocatalysts with different aspect ratios were successfully prepared via a simple solution route,boiling reflux method.X-ray powder diffraction（XRD）,field emission scanning electron microscopy（FESEM）and UV-vis diffuse reflectance spectra（UV-vis DRS）were used to characterize the products.The photocatalytic activity of samples was investigated for degradation of pentachlorophenol（PCP）under UV-vis light irradiation.The results showed that a close relationship existed between the photocatalytic performance ofα-Fe2O3/ZnO composites and the content ofα-Fe2O3.When the molar ratio ofα-Fe2O3 to ZnO was 1∶5,PCP can be completely degraded within 4h.