Abstract In this study, preparation, characterization and catalytic application of a novel core-shell structured magnetic Ti-loaded phenylene-based nanoporous organosilica (Mag@Ti-NOS) nanocomposite are developed. The Mag@Ti-NOS was synthesized via cetyltrimethylammonium bromide (CTAB) directed co-condensation of tetramethoxysilane (TMOS), tetrabutyl orthotitanate (TBOT) and 1,4-bis(triethoxysilyl)benzene (BTEB) over Mag@SiO2 under alkaline conditions. This nanocomposite was characterized by using FT-IR, EDX, PXRD, VSM, SEM, TEM, XPS, ICP and TGA techniques. These analyses showed a core-shell structure with high chemical and thermal stability for the designed material. The Mag@Ti-NOS nanocomposite was employed as an effective, powerful and recyclable catalyst in the synthesis of tetrahydrobenzo[b]pyrans in H2O at 50 °C under ultrasonic conditions. This catalyst was recovered and reused several times without significant decrease in efficiency and stability. The recovered catalyst was analyzed by FT-IR, PXRD, PXRD and SEM to study its stability during reaction process.

中文翻译：

---

磁性含钛亚苯基介孔有机二氧化硅：一种具有高回收率的强大纳米催化剂

摘要 本研究开发了一种新型核壳结构磁性载钛亚苯基纳米多孔有机二氧化硅 (Mag@Ti-NOS) 纳米复合材料的制备、表征和催化应用。Mag@Ti-NOS 是通过四甲氧基硅烷 (TMOS)、原钛酸四丁酯 (TBOT) 和 1,4-双(三乙氧基甲硅烷基)苯 (BTEB) 在碱性条件下在 Mag@SiO2 上的十六烷基三甲基溴化铵 (CTAB) 定向共缩合合成的。该纳米复合材料通过使用 FT-IR、EDX、PXRD、VSM、SEM、TEM、XPS、ICP 和 TGA 技术进行表征。这些分析表明，设计的材料具有核壳结构，具有高化学和热稳定性。Mag@Ti-NOS 纳米复合材料被用作一种有效、强大且可回收的催化剂，用于在 50°C 下在超声波条件下在 H2O 中合成四氢苯并 [b] 吡喃。该催化剂被回收和重复使用多次，效率和稳定性没有显着降低。通过FT-IR、PXRD、PXRD和SEM分析回收的催化剂，研究其在反应过程中的稳定性。