Mg-Al-Eu三元层状化合物的结构和荧光记忆效应

研究了Mg-Al-Eu三元层状氢氧化物（TLH）分别在无CO2的去离子纯水（pH=7）、苯丙氨酸水溶液（pH=5）以及苯丙氨酸钠水溶液（pH =8,9,11）体系中的结构和荧光记忆效应.X射线衍射（XRD）测试结果发现：400℃煅烧后的TLH在这不同的体系中都能很好地重构成原始的TLH结构.荧光光谱（FL）研究结果表明：400℃煅烧后的TLH在一定时间内也能较好地恢复其原始的荧光性质；但超过一定时间后,其荧光性质将发生变化,这种荧光的变化可能与其重构产物在不同溶液体系中的浸泡时间和体系的pH有关；此外,还发现重构产物的结晶度和粒子尺寸与溶液体系的pH以及浸泡时间有关.

Structural and Fluorescent Memory Effects of Mg-Al-Eu Ternary Layered Hydroxides

The structural and fluorescent memory effects of Mg-A1-Eu ternary layered hydroxides （TLHs） through the calcined TLHs were studied by immersing in CO2-free deionized water（ pH = 7）, phenylalanine solution （ pH = 5 ）, and different sodium phenylalanine solution （ pH = 8,9 and 11 ）, respectively. X-ray diffraction （ XRD ） results showed that the reconstruction of the calcined TLHs soaked in the systems. Fluorescent spectra（FL） results indicated that the recovering property of fluorescence for the calcined TLH in a certain period of time. Beyond the time, the fluorescence of the reconstructed TLHs changed, which was due to the pH of immersing solution and the time of calcined samples immersed in solution. In addition, the crystallinity and sizes of the reconstructed samples were relevant to the pH and immersing time. On the basis of these results, the mechanisms of reconstruction and flu- orescent changes were discussed.