论文部分内容阅读
以氧化镧、硝酸、硝酸铋和氨水等为原料,采用简单水热法制备了单斜晶系的LaVO4:Bi3+纳米晶体。所得产品用X-射线粉末衍射(XRD)、扫描电镜(SEM)、X射线光电子能谱(XPS)、傅立叶红外光谱(FTIR)、紫外-可见漫反射光谱(UV-vis)和光降解甲基蓝等技术进行表征和分析。测试结果表明,弱碱性水热反应合成的LaVO4:Bi3+单斜相的纳米晶体,晶粒尺寸可控在50-80 nm内。掺Bi3+晶体的紫外-可见光吸收边发生红移,其中LaVO4:Bi3+(5.0%)的能带隙为可减小至2.02eV,可见光降解亚甲基蓝溶液(1×10-5mol/L)120 min时的光降解率高达98.10%,表现出良好的可见光催化活性。
The monoclinic LaVO4: Bi3 + nanocrystals were prepared by simple hydrothermal method using lanthanum oxide, nitric acid, bismuth nitrate and ammonia as raw materials. The obtained product was characterized by X-ray powder diffraction (XRD), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectroscopy (FTIR), UV-vis and photodegradation of methyl blue And other technologies for characterization and analysis. The results show that the LaVO4: Bi3 + monoclinic nanocrystals synthesized by weakly alkaline hydrothermal reaction can control the grain size within 50-80 nm. The bandgap of LaVO4: Bi3 + (5.0%) can be reduced to 2.02eV. At visible light photodegradation of methylene blue solution (1 × 10-5mol / L) for 120 min Photodegradation rate up to 98.10%, showing good visible light catalytic activity.