Fe2O3/ZnO纳米复合结构的制备及其光催化性能研究

摘要

通过阳极氧化法在纯铁片基底上生长Fe2O3纳米管阵列薄膜,然后采用水热法在Fe2O3纳米管阵列薄膜上负载ZnO纳米棒,制得Fe2O3/ZnO复合纳米结构.借助FE-SEM、XRD、TEM、UV-Vis等手段,对不同反应时间下制得的Fe2O3/ZnO复合材料的形貌、结构、物相组成及光催化性能进行表征,重点考察了复合结构的亚甲基蓝可见光降解能力.结果表明,在外加电压为55 V的条件下阳极氧化450 s,所制备的Fe2O3纳米管阵列具有高度有序、分布均匀及垂直取向的结构特点,管径约为80 nm;在90℃的碱性锌酸盐溶液中,水热反应1.5 h后,制得的Fe2O3/ZnO复合材料具有最佳的光催化性能,该样品对亚甲基蓝的降解率可达85%.%Fe2O3 nanotube arrays (NTAs)films were prepared on pure iron substrates by anodic oxida-tion approach,then ZnO nanorods were synthesized on the surface of Fe2O3 NTAs via hydrothermal method,and the Fe2O3/ZnO nanocomposites were therefore obtained.With the aid of FE-SEM, EDS,XRD,TEM and UV-Vis,the morphology,microstructure,phase composition and photocata-lytic properties of the Fe2O3/ZnO nanocomposites prepared with different reaction times were charac-terized,and the performance for degradation of methylene blue solution under visible-light irradiation was studied.The results show that Fe2O3 NTAs prepared at the anode oxidation voltage of 55 V for 450 s exhibits highly ordered,uniformly distributed and vertically oriented structure,with the aver-age tube diameter of 80 nm.After hydrothermal reaction in alkaline zincate solution at 90 ℃ for 1.5 h,the synthesized Fe2O3/ZnO nanocomposites exhibits the optimum photocatalytic property,and the degradation rate of methylene blue solution can reach 85%.