Preparation, Characterization, and Photocatalytic Properties of CaNb2O6 Nanoparticles
Preparation, Characterization, and Photocatalytic Properties of CaNb2O6 Nanoparticles
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DOI：
10.1111/j.1551-2916.2008.02894.x
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发表时间：
2009-02
影响因子：
3.9
通讯作者：
I. Cho;Shin-Tae Bae;D. Yim;Dong‐Wan Kim;K. Hong
中科院分区：
文献类型：
--
作者：
I. Cho;Shin-Tae Bae;D. Yim;Dong‐Wan Kim;K. Hong
采用溶剂热法制备了粒径为30-50 nm的CaNb 2 O 6纳米粒子，并对其光学和光催化性能进行了研究。采用X射线粉末衍射仪、场发射扫描电子显微镜、透射电子显微镜、紫外-可见漫反射光谱仪、荧光光谱仪和拉曼光谱仪对所制备的粉体进行了表征。与固相反应法（SS）制备的相同材料的粉末相比，该纳米颗粒具有更高的比表面积、更有效的光吸收和更强的光催化活性。光致发光光谱表明，在紫外光照射下，SS法制备的纳米粉体（在300 K下有较强的蓝光发射）主要是辐射复合过程，而纳米颗粒中没有观察到明显的发射。这种减少的辐射复合以及更高的光吸收能力和更高的BET表面积导致的减少的维数增强的纳米粒子的光催化活性。
CaNb2O6 nanoparticles with a size range of 30–50 nm were synthesized by heat treatment at 600°C after a solvothermal process and their optical and photocatalytic properties were investigated. The prepared powders were characterized by X-ray powder diffractometer, field-emission scanning electron microscope, transmission electron microscope, UV-Vis diffuse reflectance spectroscopy, Fluorescence spectroscopy, and Raman spectroscopy. Compared with a powder of the same material prepared by a solid-state reaction (SS) method, the nanoparticles exhibited a higher Brunauer–Emmett–Teller (BET) surface area, more efficient light absorption, and enhanced photocatalytic activity for producing H2 from pure water under UV irradiation. The photoluminescence spectra revealed that a radiative recombination process is dominant in the powder prepared by the SS method (strong blue emission at 300 K) under UV light irradiation, while no obvious emission was observed in the nanoparticles. This decrease of the radiative recombination as well as the higher optical absorption ability and higher BET surface area resulting from the reduced dimensionality led to enhanced photocatalytic activity of the nanoparticles.