Green modification of graphene oxide nanosheets under specific pH conditions

Castellanos-Espinoza, R.; Fernández-Tavizón, S.; Sierra-Gómez, U.; Elizalde-Peña, E.A.; Luna-Bárcenas, G.; Baldenegro-Pérez, L.A.; Olvera, Lilian I.; González-Gutiérrez, Linda V.; Ramos-Castillo, C.M.; Arjona, Noé; España-Sánchez, B.L.

doi:10.1016/j.apsusc.2023.156953

Cited by 5 publications

(6 citation statements)

References 43 publications

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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%

“…The synthesis and the green modification of GO nanosheets to produce GO-Arg were previously reported 23,24 by our research group. For the membrane fabrication, PES (granule, 3 mm) and dimethyl sulfoxide (DMSO) were purchased by Sigma Aldrich and used as received.…”

Section: Methodsmentioning

confidence: 95%

“…In this regard, we have recently reported the possibility of inducing the zwitterionic character of GO nanosheets through their functionalization with aliphatic amino acids under friendly environmental conditions. 23,24 According to the above, our work describes the impact of the integration of zwitterionic GO nanosheets decorated with arginine (GO-Arg) in the formulation of nanostructured PES membranes by phase inversion and the validation of combined antibacterial and antifouling performance, including the analysis of the interaction GO-Arg with the polymer matrix in the membrane morphology, surface hydrophilicity, water flux, and surface charge, aiming to design multifunctional membranes with potential application in wastewater treatment.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

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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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“…Surface modification of nanomaterials is a key process that enhances their properties and functionality. 1,2 It involves the alteration of the surface chemistry and morphology of nanoparticles to improve their solubility, stability, and biocompatibility. 3,4 Therefore, the formation of nanomaterials is a valuable method in the field of nanoscale engineering, presenting numerous appealing concepts and opportunities in various scientific domains.…”

Section: ■ Introductionmentioning

confidence: 99%

“…Surface modification of nanomaterials is a key process that enhances their properties and functionality. , It involves the alteration of the surface chemistry and morphology of nanoparticles to improve their solubility, stability, and biocompatibility. , Therefore, the formation of nanomaterials is a valuable method in the field of nanoscale engineering, presenting numerous appealing concepts and opportunities in various scientific domains. Over the past few years, there has been an investigation into various types of meticulously arranged nanoscale configurations that can be linked to different classes of biomolecules, such as carbohydrates, lipids, proteins, and nucleic acids. − Some of the commonly used techniques for surface modification of nanomaterials include chemical functionalization, physical adsorption, and covalent binding. , …”

Section: Introductionmentioning

confidence: 99%

Surface Engineering of Superparamagnetic Graphene Oxide Nanosheet as a Chemically Tunable Platform for Facial Biofuel Production by Lipase

Landarani-Isfahani,

Arabi,

Rezaei

et al. 2024

ACS Appl. Bio Mater.

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In this research, we utilized an efficient approach to synthesize superparamagnetic graphene oxide (SPGO) rapidly in a one-pot method using microwave irradiation of graphene oxide (GO), urea, and Fe(III) ion. Tannic acid (TA) was introduced to the surface of SPGO through a straightforward and eco-friendly process. Methods were devised to furnish GO nanosheets and modify their surfaces with TA in an environmentally friendly manner. Two series of nanosheets, namely, SPGO/TA-COOH and SPGO/TA-IM, were engineered on the surface and used for immobilizing lipase enzyme. Through various analytical tools, the unique biocatalysts SPGO/TA-COOH/L and SPGO/TA-IM/L were confirmed. These biocatalysts exhibited enhanced stability at high temperatures and pH levels compared with free lipase. They also demonstrated prolonged storage stability and reusability over four months and seven cycles, respectively. Furthermore, the catalytic activity of immobilized lipase showed minimal impairment based on kinetic behavior analysis. The kinetic constants of SPGO/TA-IM/L were determined as V max = 0.24 mM min −1 , K m = 0.224 mM, and k cat = 0.8 s −1 . Additionally, the efficiency of biocatalysts for biodiesel production from palmitic acid was studied, focusing on various reaction parameters, such as temperature, alcohol to palmitic acid molar ratio, water content, and lipase quantity. The esterification reaction of palmitic acid with methanol, ethanol, and isopropanol was tested in the presence of SPGO/TA-COOH/L and SPGO/TA-IM/L, and the corresponding esters were obtained with a yield of 30.6−91.6%.

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