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以钼酸铵、硝酸铋和硝酸铕为原料,采用简单水热技术成功获得了Eu3+掺杂的片状钼酸铋(γ-Bi2 MoO6)光催化剂,借助X-射线衍射(XRD)、扫描电镜(SEM)、紫外-可见吸收光谱(UV-Vis)等测试手段对样品的物相组成、形貌和光吸收等进行了表征,并以刚果红和2,4-二硝基苯酚为模型污染物,考察了Eu3+掺杂对Bi2 MoO6光催化性能的影响.结果表明,利用这种简单的水热合成方法获得层状结构的Bi2MoO6,Eu3掺杂对Bi2MoO6光催化活性的影响与其掺杂量有关,当Eu3掺杂量为0.75％(原子分数)时,催化剂活性最好.金卤灯光照70 min,0.75％(原子分数)Eu3 +/Bi2 MoO6对2,4-二硝基苯酚降解率为54.2％,而相同条件下的纯Bi2 MoO6对2,4-二硝基苯酚降解率仅为8.1％.根据活性数据,文中Eu3+掺杂Bi2 MoO6的活性增强机理进行了讨论,认为Eu3掺杂影响了Bi2MoO6的吸附性能、光吸收特性及光生载流子的分离效率,进而对Bi2MoO6的光催化活性产生显著影响.

Using bismuth nitrate,ammonium molybdate and europium nitrate as raw materials,flake-like Eu3+ doped bismuth molybdate (γ-Bi2 MoO6) has been successfully synthesized via a facile hydrothermal process.XRD,SEM and UV-VisDRS Spectrum techniques were employed to characterize the phase composition,morphology and spectrum properties of the as-synthesized samples.Congo Red and 2,4-dinitrophenol were selected as a model pollutant to investigate the photocatalytic activity of as synthesized sample.Furthermore,the effect of Eu3+ doping amount on the γ-Bi2MoO6 photocatalytic activity was also investigated.The experimental results indicated that Eu3+ doping can enhance the photocatalytic activity of γ-Bi2 MoO6 for the photodegradation of Congo Red and 2,4-dinitrophenol,and the amount of Eu3+ doping has a serious effect on the photocatalytic activity of γ-Bi2 MoO6 photocatalyst.The optimum doping amount of Eu3 + is 0.75at％.Under the metal halide lamp light irradiation for 70 min,the photodegradation rate of 2,4-dinitrophenol reaches to 54.2％ using 0.75at％ Eu3+/γ-Bi2 MoO6 as photocatalyst,which is much higher than that of pure γ-Bi2 MoO6 + (8.1％).Based on the experimental results,the mechanism for the enhancement photocatalytic activity of Eu3+ doped γ-Bi2 MoO6 was also discussed.In Eu3+ doped γ-Bi2 MoO6 system,the enhanced photocatalytic activity was ascribed to photoelectron transfer from conduction band of γ-Bi2 MoO6 to the doping energy level of Eu3 +,resulting in the enhancement of separation efficiency of photoinduced carrier and enhancement of absorption property for pollutants.