CaYAlO_(4)∶Mn荧光粉的制备及其在硝基化合物检测的应用  

Preparation of CaYAlO_(4) : Mn Phosphors and Its Application in the Detection of Nitro Compounds

作　　者：王立娜 贾佩云[1] WANG Lina;JIA Peiyun(Northeast Forestry University,Harbin 150040,China)

机构地区：[1]东北林业大学,哈尔滨150040

出　　处：《中国陶瓷》2023年第1期39-47,共9页China Ceramics

摘　　要：硝基芳香族化合物具有剧毒、致癌、易爆、难降解等特性,对人体健康、国家安全以及自然生态系统造成极大危害,因此对其进行高精度的痕量检测是有效控制污染物排放和治理的关键。在此,我们采用柠檬酸辅助Pechini溶胶-凝胶法合成了CaYAlO_(4)∶Mn荧光粉。采用X射线衍射(XRD)、傅里叶变换红外光谱(FTIR)、扫描电子显微镜(SEM)、激光粒度分析仪和光致发光光谱(PL)对样品进行表征。结构和形貌表征表明,在1100℃下,样品结晶良好,形成了K2NiF4结构的CaYAlO_(4)晶相。样品形貌不规则,表面光滑,晶粒尺寸约为300 nm。在紫外光照射下,CaYAlO_(4)∶Mn表现出Mn(Ⅳ)的特征发射,在710 nm处以2Eg-4A2g发射为主。对硝基苯酚、1,2-二硝基苯和4-硝基甲苯等芳香族硝基化合物可以选择性猝灭CaYAlO_(4)∶Mn的发射。猝灭效应(I0/I)可以很好地拟合成线性方程,这使CaYAlO_(4)∶Mn荧光粉成为检测芳香族硝基化合物的优秀候选材料。通过实验确定猝灭机理为动态猝灭过程。Nitroaromatic compounds are highly toxic, carcinogenic, explosive, and difficult to degrade,causing great harm to human health, national security and natural ecosystem. Therefore, trace detection of nitroaromatic compounds with high accuracy is crucial to the effective emission control and pollutant treatment. Herein, we synthesized CaYAlO_(4)∶ Mn phosphors by citric acid assisted Pechini sol-gel approach. The samples were characterized by X-ray diffraction(XRD), Fourier transformation infrared(FTIR)spectroscopy, scanning electronic microscopy(SEM), laser particle analyzer, and photoluminescence(PL).The structure and morphology characterizations indicate that at 1100℃, the sample crystallized well and formed CaYAlO_(4)phase with K2NiF4structure. The samples show irregular morphology with smooth surface and a grain size of about 300 nm. Under irradiation of ultraviolet, CaYAlO_(4)∶ Mn shows the characteristic emission of Mn(Ⅳ), dominated by the ~2Eg-~4A2gemission at 710 nm. The emission of CaYAlO_(4)∶ Mn can be selectively quenched by nitroaromatic compounds such as p-nitrophenol, 1,2-dinitrobeneze and 4-nitrotoluene. The quenching effect(I0/I) can be well fitted into a linear equation, which make CaYAlO_(4)∶ Mn an excellent candidate to detect nitroaromatic compounds. The quenching mechanism is determined to be a dynamic quenching process.

关 键 词：溶胶-凝胶 CaYAlO4 磷光体 检测 芳香族硝基化合物 

分 类 号：TQ422[化学工程]