Online ISSN: 2515-8260

Keywords : Graphene oxide

Preparation Of Graphene Oxide And Its Reduction By Lemon Peel To Graphene And Diagnosed By Several Techniques

Rusul Rifat Jameel; Liqaa Hussein Alwan

European Journal of Molecular & Clinical Medicine, 2020, Volume 7, Issue 9, Pages 412-421

The research included the preparation of graphene oxide by Hummer and Modified Hummer method through a simple chemical reaction and in the presence of plant extracts, as the product was reduced by an aqueous extract of lemon peel, and the result was diagnosed using several techniques, including Fourier-transform infrared spectroscopy (FT-IR) and scanning electron Microscope (SEM) and X-ray diffraction (XRD) BET surface area, as the results of the (FT-IR) spectrum showed the appearance of oxygen groups in graphene oxide that were reduced into wafers. The results of XRD showed that the average crystal size of the prepared particles was 3.11nm, and the (SEM) showed that the prepared graphene minerals with enlargement strengths of 4.16μm and 41.6μm with diameters (1-10μm) had a large number of pores, and were in the form of transparent and thin plates And in a fluffy and folded shape, the results of the BET measurements indicated that the prepared graphene has a surface area of 169.16 m2 g / with an average pore diameter of about 3.58nm. In addition to studying some of the physical characteristics of graphene, such as the pH and the percentage of moisture, where the moisture content was (8.1%) and the pH was (7.1).

Synthesis And Study Of The Biological Activity Of Nano Schiff Bases Derived From Graphene Oxide

Marwa I Khalil; Qadoori Z Khalaf; Atheer A Mahmood; Khlood A Al-Khafaji

European Journal of Molecular & Clinical Medicine, 2020, Volume 7, Issue 6, Pages 2819-2829

Novel nanoparticles were prepared by using Schiff’s reaction, to produce the nanoparticles Schiff bases (II and III) have been prepared by the composite reaction of graphene oxide and hydrazine hydrate with Isatin and Guanine respectively. On Other hand, Nanoparticle graphene oxide (I) was prepared by using Hummer's method that includes addition of graphite to a mixture of sodium nitrate and concentrated sulfuric acid in the presence of oxidizing agents like potassium permanganate and hydrogen peroxide. The biological activity of the synthesized nanocomposite was studied against various positive and negative gram bacteria by the use of Agar well diffusion method on Mueller - Hinton, the results have shown that the Nano Schiff base II has an interesting inhibition activity especially against the Staphylococcus aureus bacteria. On the other hand, Nano Schiff base III has shown moderate activity against Bacillus thyuringiensis at high concentration of 100μL and it exhibits low - zero inhibition activity against other tested bacteria.