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采用硝酸铈、硝酸钕、尿素为原料,使用微波引诱燃烧法合成了多孔Ce1-xNdxO2-y固溶体。利用X射线衍射仪、Raman光谱仪、红外光谱仪、扫描电镜、N2吸附-脱附技术、紫外-可见吸收光谱仪等测试手段对产物进行了表征。XRD分析表明,Ce1-xNdxO2-y固溶体的粒径范围在40~60 nm之内,且所有产物为萤石结构。Raman测试表明,在Ce1-xNdxO2-y中,由于Nd3+的掺杂而产生氧空位,且空位浓度随Nd3+掺杂量的提高而增加。红外结果证明,Ce-O键的吸收峰在1400 cm-1左右处,由于Nd3+的掺杂而使得在2346 cm-1的吸收峰消失。从SEM和孔径分布结果可看出,产物为多孔结构。紫外-可见光吸收和可见光催化降解实验表明,随着Nd3+掺杂量的增加,Ce1-xNdxO2-y的紫外吸收增强;由于多孔结构和氧缺位的产生,产物在可见光范围内有较明显的吸收。
The porous Ce1-xNdxO2-y solid solution was synthesized by microwave induction combustion method using cerium nitrate, neodymium nitrate and urea as raw materials. The products were characterized by X-ray diffraction, Raman spectroscopy, infrared spectroscopy, scanning electron microscopy, N2 adsorption-desorption and UV-Vis absorption spectroscopy. XRD analysis showed that the particle size of Ce1-xNdxO2-y solid solution ranged from 40 to 60 nm, and all the products were fluorite structures. Raman tests show that in Ce1-xNdxO2-y, oxygen vacancies occur due to the doping of Nd3 +, and the vacancies increase with the increase of Nd3 + doping. Infrared results show that the Ce-O bond absorption peak at about 1400 cm-1, due to the doping of Nd3 + at 2346 cm-1 absorption peak disappears. From SEM and pore size distribution results can be seen that the product is porous structure. UV-visible absorption and visible light catalytic degradation experiments show that, with the increase of Nd3 + doping amount, the ultraviolet absorption of Ce1-xNdxO2-y increases; due to the porous structure and the absence of oxygen, the product has obvious absorption in the visible range .