Eu 3+ doped La 3 PO 7 nanoparticles were successfully synthesized under facial combustion method. The nano-phosphors then were characterized by some techniques including X-ray diffraction (XRD), scanning and transmission electron microscopy (SEM and TEM), photoluminescence spectrum (PL), and lifetime decay. SEM and TEM micrographs reveal exhibit of the La 3 PO 7 : Eu 3+ nanopowders in spherical morphology with an average size of about 20 nm, matching with Scherrer's formula calculation. Otherwise, the influence of annealing temperature and concentration of Eu 3+ ions on optical characteristics of Eu 3+ was doped La 3 PO 7 , and optical properties were investigated too. The photoluminescence shows the strong red emission originating from the 5 D 0 ¼ 7 F J (J = 1, 2, 3, and 4) transitions of Eu3+ and the 614 nm emission from the 5 D 0 ¼ 7 F 2 electronic dipole transition is dominant.

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Facile and biocompatible fabrication of ZIF-8 (zeolite imidazole framework) and its modifications are reported in two ways: TiO2@ZIF-8 and creating mesoporous. Adding a small amount of surfactant changes the traditional crystal morphology to mesoporous and reduces the amount of base needed compared to normal synthesis, thus minimizing environmental impact. The resulting crystals were characterized by X-ray diffraction (XRD), Scanning electron microscopy (SEM), Infrared Spectroscopy meter (FTIR), and nitrogen adsorption measurements, which revealed the mesoporous and TiO2@ZIF-8 with polyhedral morphology. The examination of Tetracycline (TC) delivery was thoroughly studied on these hybrids ZIF-8. The loading and release of TC were controlled under the influence of factors such as morphology, and electrostatic force... by experiment data and estimating mechanism. For the first time, the number of molecules of TC adsorbed outer ZIF-8 surface area and inside its structure was investigated. This study demonstrates a green synthesis of mesoporous and TiO2@ZIF-8, maintaining an excellent yield and scalability, successfully applying for TC delivery study, and exposes the important effects of the porous structure on drug loading and release.

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