A facile green reduction of graphene oxide using Annona squamosa leaf extract

Abstract

A highly facile and eco-friendly green synthesis of Annona squamosa (custard apple) leaf extract reduced graphene oxide (CRG) nanosheets was achieved by the reduction of graphene oxide (GO). The as-prepared CRG was characterized with X-ray diffraction (XRD), transmission electron microscope (TEM), Fourier-transform infrared spectroscopy (FT-IR), ultraviolet-visible (UV-Vis), X-ray photoelectron spectroscopy (XPS) and Raman spectroscopic techniques. Removal of oxygen containing moieties from the GO was confirmed by UV-Vis, FT-IR and XPS spectroscopic data. The XRD and Raman data further confirmed the formation of the CRG. TEM images showed the sheet structure of the synthesized CRG. These results show that the phytochemicals present in custard apple leaf extract act as excellent reducing agents. The CRG showed good dispersion in water.

Advanced “Green” Prebiotic Composite of Bacterial Cellulose/Pullulan Based on Synthetic Biology-Powered Microbial Coculture Strategy

“…The peaks at 3348 cm −1 and 2911 cm −1 exist in all specimens due to the pervasiveness of phenolic compounds containing free hydroxyl groups and C-H stretching vibration, respectively [ 57 ]. The absorption peak at 1602 cm −1 is related to the stretching vibration of C=O in acryl ketones [ 58 ], the stretching vibration of C=C in aromatic rings [ 59 , 60 ], and the bending vibration of O-H bond in phenols [ 61 ]. The redshift of the peak in this spectrum compared with the individual BC and PUL spectra can be ascribed to the hydrogen bonding between the polar groups of the components in the BC/PUL sample.…”

Honeycomb‐like carbon materials derived from coffee extract via a “salty” thermal treatment for high‐performance Li‐I2 batteries

“…Figure 4B, 4C, and 4D show the high‐resolution spectra of C 1s, N 1s, and O 1s. Markedly, the C 1s spectra in the Figure 4B shows the main peak centered at 284.6 eV and can be attributed to the typical C = C/C‐C sp2‐hybridized carbon 46 . Other peaks centered at 285.2 eV, 286.8 eV, and 288.8 eV reveal the existence of C‐N, C = O and ‐O‐C = O, 47 which corresponds to the results of N 1s spectra in Figure 4C and O 1s spectra in Figure 4D.…”

“…Markedly, the C 1s spectra in the Figure 4B shows the main peak centered at 284.6 eV and can be attributed to the typical C = C/C-C sp2-hybridized carbon. 46 Other peaks centered at 285.2 eV, 286.8 eV, and 288.8 eV reveal the existence of C-N, C = O and -O-C = O, 47 which corresponds to the results of N 1s spectra in Figure 4C and O 1s spectra in Figure 4D. Figure 4C shows the three different nitrogen types of peaks centered at 401 eV (quaternary N), 399.9 eV (pyrrolic N), and 398.8 eV (pyridinic N), 48,49 and the O 1s spectra ( Figure 4D) reveals the H-O-C = O (530.8 eV), C = O (532.1 eV), and C-OH (533.5 eV).…”

Antioxidant, Antibacterial and Anticancer Performance of Reduced Graphene Oxide Prepared via Green Tea Extract Assisted Biosynthesis

“…Most commonly used reducing agent is hydrazine. For large scale production, toxicity of hydrazine is a major concern [7] and synthesized rGO tends to agglomerate strongly due to interlayer attractive Vander Waals forces, [8] to overcome this, numerous other reducing agents have been used in literature, [9][10][11] one amongst them is reducing plant extracts, which is environmental friendly.…”

“…In environmentally friendly approach called biosynthesis or green synthesis, various natural materials such leaf extracts, peels, bio-compounds and microbes are used as reducing agent. [10,[12][13][14][15] Plant extracts are attractive alternatives because of easily available, comparatively cheap and environmental friendly. [16] Plant extracts contain various polyphenols such as gallic acid and tannin acid and can play an important role in reducing during the nanomaterials preparation.…”