Development of ternary nanoadsorbent composites of graphene oxide, activated carbon, and zero‐valent iron nanoparticles for food applications

Bagheri, Mahsa; Jafari, Seid Mahdi; Eikani, Mohammad H.

doi:10.1002/fsn3.1080

Cited by 25 publications

(3 citation statements)

References 35 publications

(43 reference statements)

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“…The ν 3 band is attributed to the stretching modes of the new Fe–O bonds (ν(Fe–O)) resulting from the interaction of iron with oxygen in polyphenolic compounds. , This band can appear in a very large range of wavenumbers from 650 to 400 cm –1 . In this region, several peaks can be distinguished that are related to the different interactions of the iron cation with the oxygen atoms in polyphenols.…”

Section: Resultsmentioning

confidence: 99%

Analysis of Iron Complexes of Tannic Acid and Other Related Polyphenols as Revealed by Spectroscopic Techniques: Implications in the Identification and Characterization of Iron Gall Inks in Historical Manuscripts

et al. 2022

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In this work, a structural analysis of the polyphenol complexes with iron and copper at several conditions is reported. The investigated polyphenols were tannic acid, gallic acid, pyrogallol, and syringic acid, being components and molecular models of the gallnuts usually employed in the past in fabrication of iron gall inks (IGIs). Commercial tannic acid extracted from gallnuts, which is a complex mixture of different gallotannins and simpler galloylglucoses, was also employed in this analysis. This analysis comprised the use of Raman, Fourier-transform infrared (FTIR), UV–vis absorption, and fluorescence spectroscopy. The complexation of iron with these molecules leads to a strong change in color due to the deep restructuring of the polyphenol that can be clearly seen by Raman and FTIR spectra. Three main Raman bands appeared at 1450–1490 cm –1 (ν 1 ), 1320–1345 cm –1 (ν 2 ), and 400–650 cm –1 (ν 3 ), which are characteristic of the metal complexes. The structural changes of the polyphenol complexes with iron were also investigated at different pHs and different polyphenol/iron stoichiometries. Other effects of the interaction of polyphenols with iron are the pH decrease of the mixture upon metal complexation and fluorescence quenching induced by the interaction of iron. This quenching is important since it facilitates the Raman inspection of manuscripts since polyphenols show a strong fluorescence emission that overlaps the Raman spectrum. Furthermore, DFT calculations were performed for the first time on the gallic acid complex with iron in order to elaborate a detailed assignment of the vibrational modes of polyphenols and their metal complexes, something that was missed in previous applications of Raman to IGIs.

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Section: Resultsmentioning

confidence: 99%

Analysis of Iron Complexes of Tannic Acid and Other Related Polyphenols as Revealed by Spectroscopic Techniques: Implications in the Identification and Characterization of Iron Gall Inks in Historical Manuscripts

et al. 2022

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“…Graphene oxide (GO) is a two‐dimensional single layer of sp2 carbon atoms carrying a number of oxygen functional groups on its surface and edges, which makes it a hydrophilic nanosheet 27‐29 . GO as one of the carbon‐based nanomaterials not only exhibits great mechanical and thermal properties but also represents superior antibacterial activity and bio‐properties among the carbonaceous nanomaterials 28,30‐34 . These all make it such an attractive candidate for bio‐based purposes.…”

Section: Introductionmentioning

confidence: 99%

Tuning polylactic acid scaffolds for tissue engineering purposes by incorporating graphene oxide‐chitosan nano‐hybrids

Majidi

Babaei

Kazemi‐Pasarvi

et al. 2020

Polymers for Advanced Techs

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The main goal of this study was to take an effective approach to promote polylactic acid (PLA) bio‐applications. In this regard, graphene oxide (GO) and spherical structure of GO‐chitosan nano‐hybrids (GO‐CS) were successfully synthesized and characterized using transmission electron microscopy, atomic force microscopy, Fourier‐transform infrared, UV–Vis, and elemental analyses. Thereafter, PLA scaffolds containing 1 wt% and 2 wt% of synthesized nanomaterials were fabricated through the solvent casting/particulate leaching procedure. Then, the biodegradability, cell adhesion, and bio‐safety properties of the prepared scaffolds were investigated. The results of bio‐degradation analyses demonstrated that the used nanomaterials prevented PLA from rapid and excessive degradation. The cell viability and contact angle results revealed that the surface hydrophilicity of PLA scaffolds was noticeably enhanced using both GO and GO‐CS nanoparticles. Although scaffolds containing GO represented a more hydrophilic surface, their cell viability reduced as a consequence of GO cytotoxicity. It was also revealed that incorporation of GO‐CS nano‐hybrids into PLA scaffold tuned the cell viability through facilitating cell adhesion, growth, and proliferation processes.

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“…For numerous years, activated carbons have also been widely used in a variety of processes, which include water treatment [ 4 , 5 , 6 , 7 , 8 , 9 ], air purification [ 10 , 11 , 12 , 13 ], gas phase applications [ 14 , 15 ], medical and pharmaceutical applications [ 7 , 16 , 17 , 18 ], food and beverage industry applications [ 19 ], energy storage and electrochemical applications [ 20 , 21 , 22 , 23 , 24 , 25 ], and catalysis and chemical processes [ 26 , 27 , 28 ].…”

Section: Introductionmentioning

confidence: 99%

The Impact of N/O-Functional Groups on the Sorption Capabilities of Activated Carbons Derived from Furfuryl Alcohol

Kałamaga,

Wróbel

2024

Molecules

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This work describes the effect of nitrogen and oxygen functional groups on the sorption properties of activated carbons produced from furfuryl alcohol. The poly(furfuryl) alcohol underwent carbonization in nitrogen, ammonia, and ammonia and air (in a 3:2 proportion) atmospheres at 600 °C for 4 h. The resulting materials were subsequently activated in a carbon dioxide atmosphere for 1 h at temperatures of 700 °C, 800 °C, 900 °C, and 1000 °C. The X-ray photoelectron spectroscopy (XPS) findings suggest that ammoxidation is superior to amination in terms of nitrogen doping. The maximum nitrogen concentration achieved after ammoxidation was 25 at.%, which decreased to 4 at.% after activation. Additionally, it was observed that oxygen functional groups have a greater impact on porous structure development compared to nitrogen functional groups. The materials activated through carbonization under an ammonia/air atmosphere attained the highest oxygen concentration of roughly 19 at.% as confirmed by XPS. The materials were evaluated for their sorption capacities for carbon dioxide and ethylene, which were 2.2 mmol/g and 2.9 mmol/g, respectively, at 30 °C.

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Development of ternary nanoadsorbent composites of graphene oxide, activated carbon, and zero‐valent iron nanoparticles for food applications

Cited by 25 publications

References 35 publications

Analysis of Iron Complexes of Tannic Acid and Other Related Polyphenols as Revealed by Spectroscopic Techniques: Implications in the Identification and Characterization of Iron Gall Inks in Historical Manuscripts

Analysis of Iron Complexes of Tannic Acid and Other Related Polyphenols as Revealed by Spectroscopic Techniques: Implications in the Identification and Characterization of Iron Gall Inks in Historical Manuscripts

Tuning polylactic acid scaffolds for tissue engineering purposes by incorporating graphene oxide‐chitosan nano‐hybrids

The Impact of N/O-Functional Groups on the Sorption Capabilities of Activated Carbons Derived from Furfuryl Alcohol

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