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首页> 外文期刊>Crystal growth & design >Development of Ambient Nanogibbsite Synthesis and Incorporation of the Method To Embed Ultrafine Nano-Al(OH)(3) into Channels and Partial Alumination of MCM-41
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Development of Ambient Nanogibbsite Synthesis and Incorporation of the Method To Embed Ultrafine Nano-Al(OH)(3) into Channels and Partial Alumination of MCM-41

机译：环境纳米菱铁矿合成的发展以及将超细纳米Al（OH）（3）嵌入通道和MAl-41的部分铝化方法的结合

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An ultrafine aluminum hydroxide nanoparticle suspension was prepared via the controlled titration of [Al(H2O)(6)](3+) with L-arginine to pH 4.6. The prepared material, predominantly 10-30 nm in diameter, was purified by GPC and subsequently identified as the gibbsite (or hydrargillite) polymorph via FTIR, powder XRD, and elemental analysis. The material's chemical environment and morphology were probed using Al-27/H-1 NMR, FTIR, ICP-OES, TEM-EDS, XPS, XRD, and N-2 adsorption experiments. Furthermore, by incorporating the newly developed synthetic route, Al(OH)(3) was partially loaded inside the mesopores (2.7 nm) of MCM-41. EDS and NMR analysis indicated that both tetrahedral and octahedral Al (O-h/T-d = 1.4) are incorporated at 11% w/w total Al and that the Si/Al ratio is 2.9, indicating that part of the Al is embedded in the Si framework. In addition, differences in elemental composition between surface XPS and bulk EDS analysis provided insight into the distribution of Al within the material. A. higher Si/Al ratio was observed on the external surface (3.6) of MCM-41 compared to that of the internal (2.9) cavities. Estimated O/Al ratios suggest predominantly Al(O)(3) and Al(O)(4) motifs present near the core and external surface, respectively. This novel methodology produces Al-MCM-41 with relatively high Al content while preserving the ordered SiO2 framework and can be used in lateral applications where incorporating hydrated or anhydrous Al2O3 is desired.
机译：通过用L-精氨酸控制滴定[Al（H2O）（6）]（3+）到pH 4.6制备超细氢氧化铝纳米颗粒悬浮液。制备的材料（直径主要为10-30 nm）通过GPC纯化，随后通过FTIR，粉末XRD和元素分析鉴定为三水铝石（或水辉石）多晶型物。使用Al-27 / H-1 NMR，FTIR，ICP-OES，TEM-EDS，XPS，XRD和N-2吸附实验对材料的化学环境和形貌进行了探测。此外，通过合并新开发的合成路线，Al（OH）（3）部分负载在MCM-41的中孔（2.7 nm）内部。 EDS和NMR分析表明，总Al含量为11％w / w时，掺入了四面体和八面体Al（Oh / Td = 1.4），并且Si / Al比为2.9，表明部分Al嵌入在Si骨架中。此外，表面XPS和本体EDS分析之间元素组成的差异为洞悉材料中Al的分布提供了见识。与内腔（2.9）相比，在MCM-41的外表面（3.6）观察到更高的Si / Al比。估计的O / Al比表明主要在芯和外表面附近分别存在Al（O）（3）和Al（O）（4）图案。这种新颖的方法可生产出Al含量相对较高的Al-MCM-41，同时保留有序的SiO2骨架，可用于需要掺入水合或无水Al2O3的横向应用。

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