Pathak Gunindra, Rajkumari Kalyani, Rokhum Samuel Lalthazuala
Department of Chemistry, National Institute of Technology, Silchar Silchar-788010 Assam India
Nanoscale Adv. 2018 Nov 21;1(3):1013-1020. doi: 10.1039/c8na00321a. eCollection 2019 Mar 12.
Biosynthesis of nanoparticles by exploiting different plant materials has become a matter of great interest in recent years and is considered as a green technology as it does not involve any harmful and toxic chemicals in the synthetic procedure. In this paper, we report a novel one-pot peel ash extract mediated bio-synthesis of basic iron oxide nanoparticles (MAPAE@FeO). The nanoparticles were fully characterized by different analytical techniques such as XRF, IR, XRD, XPS, SEM, TEM, VSM and TGA. The synthesized nanoparticles exhibited high basicity due to the presence of metal oxides, primarily basic KO in the outer layer of FeO surfaces, and showed good catalytic activity for the synthesis of β-nitroalcohol the Henry reaction at room temperature under solvent-free conditions. The catalyst was separated from the reaction medium by simply applying an external bar magnet making the process economical and less labor intensive. Furthermore, the catalyst can be reused up to the 4 cycle without much loss of its activity.
近年来，利用不同植物材料生物合成纳米颗粒已成为备受关注的课题，并被视为一种绿色技术，因为其合成过程不涉及任何有害和有毒化学物质。在本文中，我们报道了一种新型的一锅法果皮灰提取物介导的碱性氧化铁纳米颗粒（MAPAE@FeO）的生物合成。通过不同的分析技术如XRF、IR、XRD、XPS、SEM、TEM、VSM和TGA对纳米颗粒进行了全面表征。由于金属氧化物的存在，合成的纳米颗粒表现出高碱性，主要是在FeO表面外层存在碱性KO，并在无溶剂条件下室温下对β-硝基醇的合成（亨利反应）显示出良好的催化活性。通过简单地施加外部条形磁铁即可将催化剂与反应介质分离，使该过程经济且劳动强度低。此外，该催化剂可重复使用多达4个循环，而其活性不会有太大损失。
