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首页> 外文期刊>Anuario de Psicologia Juridica >Characterization of Ca doped CeO 2 quantum dots and their applications in photocatalytic degradation
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Characterization of Ca doped CeO 2 quantum dots and their applications in photocatalytic degradation

机译：Ca掺杂CeO 2 量子点的表征及其在光催化降解中的应用

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We report the synthesis of high quality undoped and Ca doped CeO2quantum dots by sol–gel method. Composition, structure and morphology of the quantum dots were analyzed by X-ray diffraction (XRD), Scanning electron microscopy with energy dispersive X-ray analysis (SEM-EDX), High resolution transmission electron microscopy (HR-TEM) and Fourier transform infrared spectroscopy (FTIR). The cubic structure of the CeO2quantum dots were determined by XRD. The influence of particle size on structural parameters such as Lattice parameter (a), Dislocation density (δ),Micro strain (ε) and Crystallite size (D) were also determined. SEM-EDX analysis shows the morphology and the presence of elements in the sample and HRTEM micrograph of CeCa5 shows uniform morphology with narrow size distribution. The FTIR analysis confirmed the influence of Ca doping in CeO2matrix. The efficiency of photocatalytic degradation of CeO2quantum dots increases with increasing of Ca doping concentration. The photodegradation rate of CeCa5 quantum dots (84%) are enhanced in comparison with bare and other doped samples towards the degradation of methylene blue (MB) dye under direct sunlight irradiation. This can be attributed to the improved separation of electron – hole pairs and superior adsorption caused by the presence of Ca.
机译：我们报告了通过溶胶-凝胶法合成高质量的无掺杂和钙掺杂的CeO2量子点。通过X射线衍射（XRD），具有能量色散X射线分析的扫描电子显微镜（SEM-EDX），高分辨率透射电子显微镜（HR-TEM）和傅里叶变换红外光谱分析了量子点的组成，结构和形态光谱（FTIR）。通过XRD确定CeO2量子点的立方结构。还确定了粒径对结构参数如晶格参数（a），位错密度（δ），微应变（ε）和微晶尺寸（D）的影响。 SEM-EDX分析显示了样品中的形貌和元素的存在，CeCa5的HRTEM显微照片显示出均匀的形貌和狭窄的尺寸分布。 FTIR分析证实了Ca掺杂对CeO2基体的影响。随着Ca掺杂浓度的增加，CeO2量子点的光催化降解效率提高。与裸样品和其他掺杂样品相比，CeCa5量子点的光降解率提高了84％，从而在阳光直射下降解了亚甲基蓝（MB）染料。这可以归因于改善的电子-空穴对分离以及因Ca的存在而产生的优异吸附。

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