La掺杂ZnO的制备及其光催化降解孔雀石绿

Synthesis of La-doped ZnO and its photocatalytic degradation to malachite green

采用溶胶-凝胶法制备了不同La掺杂量的La/ZnO催化剂,分析了其组成和性质,以孔雀石绿溶液为染料模型,研究了催化剂的光催化降解性能.结果表明,ZnO为六角纤锌矿结构,La3＋以小La2O3簇的形式均匀分布在ZnO纳米颗粒上.摩尔比La：Zn=0.05时La/ZnO具有良好的催化活性,用300 W汞灯照射2 h,孔雀石绿的降解率可达98.8%,300 W氙灯照射2 h降解率达90.4%,比ZnO的降解率提高了51.2%.

La/ZnO catalysts with different La doping amounts were prepared by sol-gel method. The microstructures and properties of La/ZnO were characterized. Using malachite green solution as the dye model, the photocatalytic degradation of the catalyst was studied. The results indicated that ZnO was hexagonal wurtzite structure, and La3＋ was uniformly distributed on the ZnO nanoparticles in the form of small La2 O3 clusters. La/ZnO had good catalytic activity when the molar ratio of La：Zn=0.05. The degradation rate of malachite green reached 98.8% within 2 h under 300 W mercury lamp illumination. The degradation rate up to 90.4% under 300 W xenon lamp irradiation 2 h, increased by 51.2% than ZnO due to La doping.