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首页> 外文期刊>RSC Advances >Chemoselective reduction of nitro and nitrile compounds using an Fe3O4-MWCNTs@PEI-Ag nanocomposite as a reusable catalyst
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Chemoselective reduction of nitro and nitrile compounds using an Fe3O4-MWCNTs@PEI-Ag nanocomposite as a reusable catalyst

机译：使用Fe3O4-MWCNTS硝基纳米复合物作为可再用催化剂的硝基和腈化合物的化学选择性减少

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摘要

Multi-walled carbon nanotubes (MWNTs) were modified with carboxylic acid functional groups (MWCNTs-(COOH) _( n ) ) prior to decoration with Fe _(3) O _(4) nanoparticles. A further modification step by polyethyleneimine (PEI) resulted in Fe _(3) O _(4) -MWCNTs@PEI which provided a suitable platform for coordination and in situ reduction of silver ions to obtain an Fe _(3) O _(4) -MWCNTs@PEI-Ag nanocomposite with highly dispersed Ag nanoparticles. The Fe _(3) O _(4) -MWCNTs@PEI-Ag hybrid material was characterized by various techniques such as Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), transmission electron microscopy (TEM), vibrating sample magnetometry (VSM), X-ray photoelectron spectroscopy (XPS) and thermogravimetric analysis (TGA), and was used as an efficient catalyst for chemoselective reduction of nitroaromatic and nitrile compounds to their corresponding amines in aqueous solution at ambient temperature. Nitrofurazone, a cytotoxic antibiotic, as a non-aromatic example was also reduced selectively at the nitro group without reduction of the other functionalities in the presence of Fe _(3) O _(4) -MWCNTs@PEI-Ag. The catalyst was magnetically recoverable and maintained its activity for at least six cycles without considerable loss of efficiency.
机译：在用Fe _（3）O _（4）纳米颗粒装饰之前，用羧酸官能团（MWCNTS-（COOH）_（N））改性多壁碳纳米管（MWNT）。通过聚乙烯亚胺（PEI）进一步改性步骤，得到Fe _（3）O _（4）-mwnts @ PEI，其提供了合适的配位平台，并原位还原银离子以获得Fe _（3）O _（ 4）-MWCNTS @ PEI-AG纳米复合材料，具有高度分散的Ag纳米颗粒。 Fe _（3）O _（4）-MWCNTs @ PEI-AG混合材料的特征在于诸如傅里叶变换红外光谱（FT-IR），X射线衍射（XRD），透射电子显微镜（TEM）等各种技术，振动样品磁体（VSM），X射线光电子能谱（XPS）和热重分析（TGA），并用作在环境温度下水溶液中的硝基芳族和丁腈化合物的硝基芳族和腈化合物的高效催化剂。在硝基组中选择性地在硝基组中选择性地减少硝呋脲，一种细胞毒性抗生素，在没有减少Fe _（3）O _（4）-mwnts @ PEI-AG的情况下的其他功能。催化剂是磁性可回收的，并将其活性保持至少六个循环，而不具有相当大的效率损失。

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