Biofabrication of polyphenols stabilized reduced graphene oxide and its anti-tuberculosis activity

Han, Wei; Niu, Wenyi; Sun, Bing; Shi, Guangcan; X, Cui

doi:10.1016/j.jphotobiol.2016.10.032

Cited by 24 publications

(15 citation statements)

References 20 publications

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“…The FTIR spectra of GO ( Figure 3) reveal specific bands of GO, similar to previous literature reports [33,36,37]. The peak from 1720 cm −1 is attributed to C=O stretching vibration present in the C=O and COOH of GO.…”

Section: Fourier Transform Infrared Spectroscopysupporting

confidence: 84%

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Chitosan/Graphene Oxide Nanocomposite Membranes as Adsorbents with Applications in Water Purification

Croitoru

Ficai

et al. 2020

Materials

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The scope of this article is to develop composite membranes using chitosan (CS) and graphene oxide (GO) as adsorbents for the removal of inorganic pollutants such as heavy metal ions, particularly Pb2+, from aqueous solutions. GO was obtained by modified Hummers method and blended with CS solution. The introduction of ethylenediaminetetraacetic acid (EDTA) compound to CS/GO suspension lead to an increased adsorption capacity of CS/GO for the elimination of heavy metals by forming stable chelates with them. The synthesized membranes were examined by Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM), and the adsorption behaviour of Pb2+ from aqueous solutions using CS/EDTA/GO membranes was evaluated using inductively coupled plasma mass spectrometry (ICP-MS). The adsorption performance of Pb2+ ions was studied by monitoring the concentration of Pb2+ against the adsorption period at an initial content of the adsorbent. The maximum adsorption efficiency of Pb2+ metal ions reached 767 mg·g−1 for CS/EDTA/GO 0.1%, 889 mg·g−1 for CS/EDTA/GO 0.3%, 970 mg·g−1 for CS/EDTA, 853 mg·g−1 for CS and 1526 mg·g−1 for GO. These findings show promising potential for CS/EDTA/GO membranes as effective adsorbent materials for the removal of heavy metal ions in water.

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Section: Fourier Transform Infrared Spectroscopysupporting

confidence: 84%

“…The absorption band at 1579 cm −1 corresponds to C=C stretching vibration, and the bands at 1160 and 1030 cm −1 are attributed to COC and -COH stretching vibration groups. The broad peak at 3109 cm −1 is attributed to the associated -OH group from GO [33,36,37].…”

Section: Fourier Transform Infrared Spectroscopymentioning

confidence: 99%

Chitosan/Graphene Oxide Nanocomposite Membranes as Adsorbents with Applications in Water Purification

Croitoru

Ficai

et al. 2020

Materials

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“…The amphiphilic and planar structure of the graphene oxide (containing different functional groups: epoxy, hydroxyl, carboxyl, carbonyl, etc.) allows it to incorporate hydrophilic and/or hydrophobic biomolecules onto the structure in order to improve its stability in a particular environment and to have minimal toxicity for biomedical applications [13,27,28,29,30,31].…”

Section: Introductionmentioning

confidence: 99%

Multifunctional Platforms Based on Graphene Oxide and Natural Products

et al. 2019

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Background and objectives: In the last few years, graphene oxide has attracted much attention in biomedical applications due to its unique physico-chemical properties and can be used as a carrier for both hydrophilic and/or hydrophobic biomolecules. The purpose of this paper was to synthesize graphene oxide and to obtain multifunctional platforms based on graphene oxide as a nanocarrier loaded with few biologically active substances with anticancer, antimicrobial or anti-inflammatory properties such as gallic acid, caffeic acid, limonene and nutmeg and cembra pine essential oils. Materials and Methods: Graphene oxide was obtained according to the method developed by Hummers and further loaded with biologically active agents. The obtained platforms were characterized using FTIR, HPLC, TGA, SEM, TEM and Raman spectroscopy. Results: Gallic acid released 80% within 10 days but all the other biologically active agents did not release because their affinity for the graphene oxide support was higher than that of the phosphate buffer solution. SEM characterization showed the formation of nanosheets and a slight increase in the degree of agglomeration of the particles. The ratio I2D/IG for all samples was between 0.18 for GO-cembra pine and 0.27 for GO-limonene, indicating that the GO materials were in the form of multilayers. The individual GO sheets were found to have less than 20 µm, the thickness of GO was estimated to be ~4 nm and an interlayer spacing of about 2.12 Å. Raman spectroscopy indicated that the bioactive substances were adsorbed on the surface and no degradation occurred during loading. Conclusions: These findings encourage this research to further explore, both in vitro and in vivo, the biological activities of bioactive agents for their use in medicine.

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“…7. The release of MCPA anion from MCPA-GO nanocomposite was recognized due to the π-π stacking interaction and hydrophobic bonding between MCPA and graphite oxide [20][21]. Besides, charge-density of the anion of aqueous media solution will also contribute to this phenomenon.…”

Section: Controlled Release Studiesmentioning

confidence: 99%

Physicochemical Characterization and Controlled Release Formulation on Intercalated 2-Methyl-4-chlorophenoxy Acetic Acid-Graphite Oxide (MCPA-GO) Nanocomposite

et al. 2020

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In this present work, herbicide named 2-methyl-4-chlorophenoxy acetic acid (MCPA) was intercalated into the graphite oxide through ion-exchange method to produce an MCPA-GO nanocomposite as an herbicide delivery system. The formation of MCPA-GO nanocomposite was confirmed by using PXRD, Fourier Transform Infrared Spectroscopy (FTIR), Thermal Gravimetric Analysis (TGA), UV-Visible Spectroscopy and Accelerated Surface Area Surface (ASAP). As for PXRD pattern, there was increasing in the basal spacing of the nanocomposite from the graphite oxide which by 9.3 to 9.7 Å indicated that MCPA has successfully inserted into the interlayers of the graphite oxide. Meanwhile, the FTIR spectrum showed the appearance of a new peak in MCPA-GO nanocomposite at 1308 cm -1 represents the functional group of carboxylate (COO -). This peak is very necessary for the confirmation of the anionic form of MCPA inserted into the interlayers of graphite oxide. The controlled release property was also done for further investigation by using various aqueous media to determine the percentage release of MCPA from the nanocomposite. The percentage of herbicide release in Na3PO3 solution was higher than in Na2CO3 and NaCl solution proved that the release properties exhibit the potential application of graphite oxide as effective nanocarrier of herbicides. MCPA-GO nanocomposite suggested being most promising herbicide since it can lower the toxicity of precursor MCPA, high biocompatibility, and more efficient in herbicide delivery system.

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Biofabrication of polyphenols stabilized reduced graphene oxide and its anti-tuberculosis activity

Cited by 24 publications

References 20 publications

Chitosan/Graphene Oxide Nanocomposite Membranes as Adsorbents with Applications in Water Purification

Chitosan/Graphene Oxide Nanocomposite Membranes as Adsorbents with Applications in Water Purification

Multifunctional Platforms Based on Graphene Oxide and Natural Products

Physicochemical Characterization and Controlled Release Formulation on Intercalated 2-Methyl-4-chlorophenoxy Acetic Acid-Graphite Oxide (MCPA-GO) Nanocomposite

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