The present study has successfully intercalated graphene oxide (GO) nanosheets and silica into the montmorillonite (MMT) interlayer and deposited them onto its external surface to make montmorillonite, silica, and graphene oxide composite (MMT-silica-GO). The as-prepared composite demonstrates improved thermal stability compared to neat MMT and GO. It was followed by incorporating chiral thiourea (CTU) scaffold into MMT-silica-GO-based composite to establish chiral MMT-silica-GO-CTU-based heterogeneous system and tested over Strecker reaction, revealing high activity and selectivity. FTIR, Raman spectroscopy, powder X-ray diffraction, SAXS, XPS, BET, SEM, EDAX, and thermogravimetric analysis were used to characterize the samples. It was credited to the synergistic effect between the composite components that enhanced access to active sites and dispersion of catalyst. Across the board, the chiral MMT-silica-GO-CTU-based heterogeneous system appears to be a promising candidate for the Strecker reaction.

中文翻译：

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蒙脱石-二氧化硅-氧化石墨烯复合材料与手性硫脲结合用于 Strecker 反应

本研究成功地将氧化石墨烯（GO）纳米片和二氧化硅嵌入蒙脱石（MMT）夹层中，并将其沉积在其外表面，制成蒙脱石、二氧化硅和氧化石墨烯复合材料（MMT-二氧化硅-GO）。与纯 MMT 和 GO 相比，所制备的复合材料表现出更高的热稳定性。随后将手性硫脲（CTU）支架加入到基于MMT-二氧化硅-GO的复合材料中，建立基于手性MMT-二氧化硅-GO-CTU的异质体系，并通过Strecker反应进行测试，显示出高活性和选择性。使用 FTIR、拉曼光谱、粉末 X 射线衍射、SAXS、XPS、BET、SEM、EDAX 和热重分析来表征样品。这被认为是复合材料组分之间的协同效应，增强了活性位点的接触和催化剂的分散。总体而言，基于手性 MMT-silica-GO-CTU 的异质系统似乎是 Strecker 反应的有希望的候选者。