Zwitterion-decorated graphene oxide nanosheets with aliphatic amino acids under specific pH conditions

Espinoza, Randy; Sierra-Gómez, U.; López, Carlos M.; González-Gutiérrez, Linda V.; Castillo, Blanca Estela; Bárcenas, Gabriel Luna; Peña, Eduardo; Bueno, J.; Fernández, Salvador; España‐Sánchez, Beatriz Liliana

doi:10.1016/j.apsusc.2021.149723

Cited by 15 publications

(12 citation statements)

References 77 publications

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“…Figure 5 represents the GO zeta potential change with pH and the values are negative at all pH values studied. The data in Figure 5 suggest that the GO oxygen species are deprotonated in the whole pH range studied and the data agree with other GOs and carbon-based materials [37,[61][62][63]. The negative zeta potential values in acid pH showed that GO forms stable colloids due to the ionized oxygen functional groups (-COOH) electrostatic repulsion [37,62], which helps the adsorption of positively charged MB dye.…”

Section: Evaluation Of Surface Hydroxylsupporting

confidence: 76%

“…The data in Figure 5 suggest that the GO oxygen species are deprotonated in the whole pH range studied and the data agree with other GOs and carbon-based materials [37,[61][62][63]. The negative zeta potential values in acid pH showed that GO forms stable colloids due to the ionized oxygen functional groups (-COOH) electrostatic repulsion [37,62], which helps the adsorption of positively charged MB dye. The discrepancies in pH(PZC) evaluated from TOTH curves and zeta potential measurement can be ascribed to the (a) differences in the evaluation methods used and (b) GO ageing process.…”

Section: Evaluation Of Surface Hydroxylsupporting

confidence: 76%

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A Study of Methylene Blue Dye Interaction and Adsorption by Monolayer Graphene Oxide

Ederer

Ecorchard

Slušná

et al. 2022

Adsorption Science & Technology

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The graphene oxide (GO) interaction with methylene blue (MB) cationic dye was studied in an aqueous solution at different pH during MB adsorption. The mutual interaction of MB with GO surface was studied and evaluated by Fourier transform infrared spectroscopy (FTIR) and X-ray diffraction (XRD). The π-π and electrostatic interaction of MB with GO surface are the main types of interactions, and the XRD data show the monomeric arrangement of MB cation with GO. The GO surface functional groups and point of zero charge (PZC) were determined by acid-base titration. Suitability of zeta-potential measurement and acid-base titration method was briefly discussed. The quality of prepared GO was evaluated by Raman spectroscopy, XRD, and atomic force microscope (AFM). The experimental adsorption equilibrium data were analyzed using Langmuir, Langmuir-Freundlich, Freundlich, and Temkin isotherms. The GO maximum adsorption capacity increases with higher pH, that is ascribed to the facile interaction of negatively charged GO with positively charged MB structure.

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Section: Evaluation Of Surface Hydroxylsupporting

confidence: 76%

Section: Evaluation Of Surface Hydroxylsupporting

confidence: 76%

A Study of Methylene Blue Dye Interaction and Adsorption by Monolayer Graphene Oxide

Ederer

Ecorchard

Slušná

et al. 2022

Adsorption Science & Technology

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“…As the concentration of GO‐Arg increases, the CA increases, making the membranes more hydrophobic. This process occurs due to the electrostatic charges of the GO‐Arg since this material presented a reduction in its surface, in addition to a cationic contribution 23,24 . Consequently, the charge of the material is less negative, affecting the hydrophilicity of the membrane 24 .…”

Section: Resultsmentioning

confidence: 99%

Combined antibacterial and antifouling properties of polyethersulfone mixed matrix membranes with zwitterionic graphene oxide nanostructures

Castellanos Espinoza,

Huhn Ibarra,

Montes Luna

et al. 2024

Polymer Engineering & Sci

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The impact of zwitterionic graphene oxide (GO‐Arg) nanostructures into polyethersulfone (PES) membranes was studied, aiming to perform mixed matrix membranes (MMMs) with combined antibacterial and antifouling properties. For this purpose, 0.25, 0.50, and 1.0 wt% of GO‐Arg were incorporated through the phase inversion method. The chemical composition reveals that the electrostatic interactions of PES, polyvinylpyrrolidone, and GO‐Arg occur by enhancing the CH/NH vibrations associated with the intrinsic MMMs and their combined antibacterial and antifouling performance. Well‐defined finger‐like morphology was observed, performing the pore distribution and the finger‐cavity inclination induced by the electrostatic charge of GO‐Arg. As a result, GO‐Arg MMM's hydrophobic properties decreased from 77.8° to 52.3°, inducing a partially hydrophilic surface and improved water flux. The isoelectric point of nanostructured membranes slightly changes by the charge modulation produced by zwitterionic GO‐Arg. The antibacterial activity against Gram (−) Escherichia coli was improved, closing the complete bacterial inhibition after 24 h. As a result, antifouling performance was improved, avoiding bacterial adhesion into the membrane surface and the possibility of promoting biofilm formation. Our results demonstrate that zwitterionic nanomaterials in MMMs perform the multifunctional capacity of materials, emerging as an effective alternative with potential application in wastewater treatment.Highlights The incorporation of zwitterionic GO‐Arg improves the mechanical properties of MMMs. GO‐Arg‐enhanced well‐defined porous finger‐like morphology in MMMs. GO‐Arg improves the antibacterial/antifouling performance of PES‐based MMMs.

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“…Figure 5a shows the XRD patterns of CS, GO, GO-FL-CS, and Ag NPs@GO-FL-CS. The diffractogram pattern of GO revealed a broad peak at the Bragg angle (2θ) 10.69 • , which is characteristic of the d-spacing of 0.83 nm [32,33], while the CS pattern consisted of two broad peaks at 2θ 10.81 • and 19.86 • due to the presence of intra-and intermolecular hydrogen bonds between the CS chains [34]. The GO-FL-CS diffraction spectrum showed a broad peak at 2θ 10.94 • , which was attributed to the polymeric FL-CS material, and a band at 2θ 26.20 • that was assigned to the covalently functionalised GO with an interlayer distance of 0.31 nm.…”

Section: Characterisationmentioning

confidence: 99%

In Situ Stabilisation of Silver Nanoparticles at Chitosan-Functionalised Graphene Oxide for Reduction of 2,4-Dinitrophenol in Water

et al. 2021

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This investigation reports the in situ growth of silver nanoparticles onto covalently bonded graphene oxide-chitosan, which serve as supported nanocatalysts for the NaBH4 reduction of 2,4-dinitrophenol in aqueous systems. Fumaryl chloride reacted with chitosan in an acidic environment to yield a tailored polymeric material. The latter was, in turn, treated with the pre-synthesised graphene oxide sheets under acidic conditions to generate the GO-functionalised membrane (GO-FL-CS). The adsorption of Ag+ from aqueous media by GO-FL-CS yielded a set of membranes that were decorated with silver nanoparticles (Ag NPs@GO-FL-CS) without any reducing agent. Various analytical tools were used to characterise these composites, including Fourier transform infrared spectroscopy, Brunauer-Emmett-Teller surface area analysis, X-ray diffraction, scanning electron microscopy/energy-dispersive X-ray analysis, inductively coupled plasma-mass spectrometry, and transmission electron microscopy. The silver-loaded materials were further used for the remediation of 2,4-dinitrophenol from aqueous solutions under batch operation. The BET analysis revealed that the functionalisation of GO with chitosan and Ag NPs (average size 20–60 nm) resulted in a three-fold increased surface area. The optimised catalyst (Ag mass loading 16.95%) displayed remarkable activity with an apparent pseudo-first-order rate constant of 13.5 × 10−3 min−1. The cyclic voltammetry experiment was conducted to determine the nitro-conversion pathway. The reusability/stability test showed no significant reduction efficiency of this metal-laden composite over six cycles. Findings from the study revealed that Ag NPs@GO-FL-CS could be employed as a low-cost and recyclable catalyst to convert toxic nitroaromatics in wastewater.

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Zwitterion-decorated graphene oxide nanosheets with aliphatic amino acids under specific pH conditions

Cited by 15 publications

References 77 publications

A Study of Methylene Blue Dye Interaction and Adsorption by Monolayer Graphene Oxide

A Study of Methylene Blue Dye Interaction and Adsorption by Monolayer Graphene Oxide

Combined antibacterial and antifouling properties of polyethersulfone mixed matrix membranes with zwitterionic graphene oxide nanostructures

In Situ Stabilisation of Silver Nanoparticles at Chitosan-Functionalised Graphene Oxide for Reduction of 2,4-Dinitrophenol in Water

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