共沉淀法制备的La2O2CO3·CeO2·ZnO的合成、结构、光致发光及光催化活性
Synthesis, structure, PL and photocatalytic activities of La2O2CO3·CeO2·ZnO fabricated by co-precipitation method.
作者信息
Subhan Md Abdus, Ahmed Tanzir, Uddin Nizam
机构信息
Department of Chemistry, Shah Jalal University of Science and Technology, Sylhet, Bangladesh.
Department of Chemistry, Shah Jalal University of Science and Technology, Sylhet, Bangladesh.
出版信息
Spectrochim Acta A Mol Biomol Spectrosc. 2015 Mar 5;138:827-33. doi: 10.1016/j.saa.2014.10.114. Epub 2014 Nov 13.
A novel tri metallic oxide nanocomposite La2O2CO3·CeO2·ZnO has been synthesized by a simple co-precipitation method. The nanocomposite has been characterized by XRD, SEM, EDS, FTIR and PL spectra. The crystallite size of the La2O2CO3·CeO2·ZnO was calculated using XRD data. The crystallite size of the as synthesized sample varies in the range of 16-30nm and those annealed at 950°C in the range of 26-70nm. Excitation at different wavelengths showed PL in UV and visible regions. It has been found that PL behavior of La2O2CO3·CeO2·ZnO is excitation wavelength dependent. This PL property is conflicting to well-known Kasha's rule of excitation wavelength dependence of emission spectrum. The catalyst shows better photocatalytic dye degradation efficiency in slightly alkaline pH in presence of H2O2.
通过简单的共沉淀法合成了一种新型三金属氧化物纳米复合材料La2O2CO3·CeO2·ZnO。采用XRD、SEM、EDS、FTIR和PL光谱对该纳米复合材料进行了表征。利用XRD数据计算了La2O2CO3·CeO2·ZnO的微晶尺寸。合成样品的微晶尺寸在16 - 30nm范围内，在950°C退火后的微晶尺寸在26 - 70nm范围内。不同波长的激发显示在紫外和可见光区域有PL现象。已发现La2O2CO3·CeO2·ZnO的PL行为与激发波长有关。这种PL性质与众所周知的发射光谱激发波长依赖性的卡莎规则相矛盾。该催化剂在H2O2存在下，在略碱性pH值条件下表现出较好的光催化染料降解效率。
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