【摘要】 利用新型燃烧法和水热法分别制得α-Fe2O3及六方晶系无水WO3,再用溶剂分散法制得WO3-Fe2O3异质结.采用XRD,TEM,BET比表面积、紫外-可见漫反射谱(DRS)等技术对WO3-Fe2O3进行了表征,并以罗丹明B的光催化降解为探针反应,评价了其光催化活性.结果表明,复合氧化物WO3-Fe2O3的粒子形态均为棒状,粒径约为80nm,比表面积为46.91m2/g;在可见光区有强吸收,带隙估算为2.4eV;对多种染料具有光催化降解活性,其中0.1gWO3-Fe2O3(ω(Fe2O3)=5%)在可见光作用下,100mL10mg/L的罗丹明B降解率可达到97.73%,表现出明显的可见光降解活性.通过计算半导体能带位置,讨论了光催化反应活性提高的机理.更多还原

【Abstract】 α-Fe2O3 and hexagonal cubic WO3 nanorods were successfully prepared by new combustion synthesis and hydrothermal method,respectively.WO3-Fe2O3 heterojunction was prepared by solvent dispersion method.The product was characterized by XRD,TEM,BET specific surface area and UV-Vis diffuse reflectance spectroscopy(DRS).The photocatalytic degradation of Rhodamine B in aqueous solution was used as a probe reaction.The results indicate that particles are all rodlike,with sizes of about 80 nm and specific surface area of 46.91 m2/g.The heterojunction has a strong absorption in the visible light range and its band gap is calculated to be 2.4 eV.WO3-Fe2O3 has marked photocatalytic degradation activity of multiple dyes.The highest degradation efficiency is reached at 97.73% when 0.1 g WO3-Fe2O3(ω(Fe2O3)=5%)was dispersed in 100 mL at 10 mg/L Rhodamine B.Basis on the calculated energy band positions,the mechanism of enhanced photocatalytic activity is discussed.更多还原