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以硝酸铋和硝酸镧为原料,采用水热法制备了形貌可控的花形状Bi_2O_3和La~(3+)掺杂Bi_2O_3光催化剂,利用X射线衍射、透射电镜、能谱、N2吸附-脱附和紫外-可见近红外光谱法等方法对材料的结构和形貌进行表征。通过紫外-可见吸收光谱法研究了催化剂对罗丹明B(RhB)光催化降解效率。结果表明:样品具有可控形貌的花形状结构及较窄的孔径分布(3.624nm),当稀土离子La~(3+)掺杂到花形状Bi_2O_3后,不仅是原Bi_2O_3的花形结构没有破坏,而且光吸收范围拓展到600nm左右。利用模拟太阳光(氙灯,350W,λ>420nm)光源,对RhB进行光催化降解时,产生了良好光催化活性,其光催化活性明显高于纯Bi_2O_3纳米颗粒和花形状Bi_2O_3,光照180min后,降解效率达到99.1%以上。
The bismuth nitrate and lanthanum nitrate were used as raw materials to prepare the flower-shaped Bi_2O_3 and La_ (3+) doped Bi_2O_3 photocatalysts with hydrothermal control. X-ray diffraction, transmission electron microscopy, Desorption and UV-visible near-infrared spectroscopy and other methods to characterize the structure and morphology of the material. The photocatalytic degradation of rhodamine B (RhB) was studied by UV-Vis absorption spectroscopy. The results show that the sample has a controlled morphology and narrow pore size distribution (3.624nm). When La 3+ is doped into the flower shape Bi 2 O 3, not only is the flower structure of the original Bi 2 O 3 crystal intact , And the light absorption range extends to about 600nm. The photocatalytic degradation of RhB by simulated sunlight (xenon lamp, 350W, λ> 420nm) light source produced good photocatalytic activity, and its photocatalytic activity was significantly higher than pure Bi_2O_3 nanoparticles and flower shape Bi_2O_3. After 180min of illumination, Degradation efficiency of 99.1%.