Department of Surface Coatings and Corrosion, Institute for Color Science and Technology (ICST), Tehran, Iran.
Department of Surface Coatings and Corrosion, Institute for Color Science and Technology (ICST), Tehran, Iran.
J Hazard Mater. 2019 Jun 5;371:609-624. doi: 10.1016/j.jhazmat.2019.03.046. Epub 2019 Mar 12.
Reduced graphene oxide (rGO) is relied upon to be the most promising candidate for high-proficiency. Hydrazine is the most conventional efficient reducing agent that has been frequently used for reduction of graphene oxide, however, it is not environmentally safe due to its toxic nature, causing unsatisfactory defects on the basal plan of GO. Therefore, employing green and efficient reducing agents from natural sources like plant extracts has become the research interest for obtaining high quality reduced graphene oxide sheets in recent years. Here a one-step, easy, cost-effective and green synthesis method based on Nettle leaves' extract has been introduced as an effective reduction method of graphene oxide compared with the toxic and harmful Hydrazine hydrate substance. In this study, GO and rGO were obtained from various methods and characterized by Raman spectroscopy, field emission scanning electron microscope, high-resolution transmission electron microscope (HR-TEM), X-ray diffraction analysis (XRD) and X-ray photon spectroscopy (XPS) analysis. Results of different analytical techniques revealed that the Nettle leaves' extract could successfully reduce GO sheets to high performance reduced graphene oxide with 79% efficiency in comparison with conventional Hydrazine hydrate. On the other side the rGO obtained by Nettle solution could scavenge the free radicals with 70% inhibition capacity at least concentration. Existence of Histamine and Serotonin and many other polyphenols as a part of Nettle leaves composition by following anti-oxidants mechanisms (H donation or electron transfer) promote the anti-oxidant functionality of Nettle leaves. So the highlighted achievement of this paper is to obtain a highly anti-oxidant green reduced graphene oxide with a wide applications i.e medical and polymer composite with UV-shielding activity.
还原氧化石墨烯（rGO）被认为是高效能的最有前途的候选者。水合肼是最传统的高效还原剂，常用于还原氧化石墨烯，但由于其毒性，对 GO 的基面造成了不理想的缺陷，因此对环境不安全。因此，近年来，从植物提取物等天然来源中使用绿色高效的还原剂已成为获得高质量还原氧化石墨烯片的研究热点。本文介绍了一种基于荨麻叶提取物的一步法、简便、经济高效且绿色的合成方法，与有毒有害的水合肼相比，该方法是一种有效的氧化石墨烯还原方法。在这项研究中，GO 和 rGO 是通过各种方法获得的，并通过拉曼光谱、场发射扫描电子显微镜、高分辨率透射电子显微镜 (HR-TEM)、X 射线衍射分析 (XRD) 和 X 射线光电子能谱 (XPS) 分析进行了表征。不同分析技术的结果表明，荨麻叶提取物可以成功地将 GO 片还原为高性能的还原氧化石墨烯，效率为 79%，而传统的水合肼为 70%。另一方面，由荨麻溶液获得的 rGO 可以至少在浓度下清除 70%的自由基。荨麻叶成分中存在组胺和血清素以及许多其他多酚，作为抗氧化机制的一部分（H 供体或电子转移），促进了荨麻叶的抗氧化功能。因此，本文的突出成就是获得具有广泛应用的高抗氧化性绿色还原氧化石墨烯，即具有紫外线屏蔽活性的医疗和聚合物复合材料。
